Institute for Mathematics and its Applications University of Minnesota 114 Lind Hall 207 Church Street SE Minneapolis, MN 55455 
20092010 Program
See http://www.ima.umn.edu/20092010/ for a full description of the 20092010 program on Complex Fluids and Complex Flows.
10:45am11:15am  Coffee break  Lind Hall 400  
11:15am12:15pm  Variational representations, small noise large deviations and applications  Vasileios Maroulas (University of Minnesota)  Lind Hall 305  PS 
10:45am11:15am  Coffee break  Lind Hall 400  
2:30pm3:20pm  Topics in the theory of the NavierStokes equations  Vladimir Sverak (University of Minnesota)  Lind Hall 305 
10:45am11:15am  Coffee break  Lind Hall 400 
10:45am11:15am  Coffee break  Lind Hall 400  
1:25pm2:25pm  Laser ribbon bond loop shape prediction and optimization  J. Michael Gray (Medtronic)  Vincent Hall 570  IPS 
8:15am8:45am  Registration and coffee  EE/CS 3176  T12.56.09  
8:45am9:00am  Welcome to the IMA  Fadil Santosa (University of Minnesota)  EE/CS 3180  T12.56.09 
9:00am10:30am  Electrokinetics of highly charged surfaces  Todd Squires (University of California, Santa Barbara)  EE/CS 3180  T12.56.09 
10:30am10:45am  Coffee break  EE/CS 3176  T12.56.09  
10:45am12:15pm  Electrokinetic phenomena in particulate suspensions: an introduction  David Saintillan (University of Illinois at UrbanaChampaign)  EE/CS 3180  T12.56.09 
12:15pm2:00pm  Lunch  T12.56.09  
2:00pm3:30pm  Electroosmotic flow and dispersion in microfluidics  Sandip Ghosal (Northwestern University)  EE/CS 3180  T12.56.09 
3:30pm4:00pm  Coffee break  EE/CS 3176  T12.56.09  
4:00pm5:30pm  Electric double layer and concentration polarization  Boris Zaltzman (Jacob Blaustein Institute for Desert Research)  EE/CS 3180  T12.56.09 
8:30am9:00am  Coffee  EE/CS 3176  T12.56.09  
9:00am10:30am  Electrowetting and digital microfluidics  Ali Nadim (Claremont Graduate University)  EE/CS 3180  T12.56.09 
10:30am10:45am  Coffee break  EE/CS 3176  T12.56.09  
10:45am12:15pm  Confinement effects with macromolecules  Susan J. Muller (University of California, Berkeley)  EE/CS 3180  T12.56.09 
12:15pm2:00pm  Lunch  T12.56.09  
2:00pm3:30pm  An Introduction to interfaces and multiphase flows in microfluidics  Shelley L. Anna (Carnegie Mellon University)  EE/CS 3180  T12.56.09 
3:30pm4:00pm  Coffee break  EE/CS 3176  T12.56.09  
4:00pm5:30pm  Inducedcharge electrokinetics  Martin Z. Bazant (Massachusetts Institute of Technology)  EE/CS 3180  T12.56.09 
All Day  Chair: Sandip Ghosal (Northwestern, University)  W12.711.09  
8:15am8:45am  Registration and coffee  EE/CS 3176  W12.711.09  
8:45am9:00am  Welcome to the IMA  Fadil Santosa (University of Minnesota)  EE/CS 3180  W12.711.09 
9:00am9:40am  Programmable soft matter  Manu Prakash (Harvard University)  EE/CS 3180  W12.711.09 
9:40am10:20am  DNA electrophoresis in microfabricated arrays  Kevin D. Dorfman (University of Minnesota)  EE/CS 3180  W12.711.09 
10:20am10:50am  Coffee break  EE/CS 3176  W12.711.09  
10:50am11:30am  Electrokinetics in planar nanofluidic channels  Sumita Pennathur (University of California, Santa Barbara)  EE/CS 3180  W12.711.09 
11:30am1:30pm  Lunch  W12.711.09  
1:30pm2:10pm  Wetting of structured substrates and flexible membranes  Reinhard Lipowsky (Max Planck Institute for Colloids and Interfaces)  EE/CS 3180  W12.711.09 
2:10pm2:50pm  Mixing and internal flows in drops in AC electrowetting  Frieder Mugele (Universiteit Twente)  EE/CS 3180  W12.711.09 
2:50pm3:00pm  Group Photo  W12.711.09  
3:00pm3:30pm  Coffee break  EE/CS 3176  W12.711.09  
3:30pm4:00pm  Second chances  EE/CS 3180  W12.711.09  
4:00pm6:00pm  Reception and Poster Session Poster submissions welcome from all participants Instructions  Lind Hall 400  W12.711.09  
Numerical simulations of dynamic wetting  Shahriar Afkhami (New Jersey Institute of Technology)  
Particle separation by capillary electrophoresis in nanochannels  Paul J. Atzberger ()  
Strongly nonlinear dynamics of electrolytes in large ac voltages  Henrik Bruus (Technical University of Denmark)  
Nonmonotonic energy dissipation in microfluidic cantilever resonators  Thomas P. Burg (MaxPlanckInstitut für Biophysikalische Chemie)  
Capillarydriven thinfilm flows on stationary and periodicallystretched substrates having isolated topographic features  Greg P. Chini (University of New Hampshire)  
Enhancement of charged macromolecule capture by nanopores in a salt gradient  Tom Chou (University of California, Los Angeles)  
Micro and nanoscale transport of biomolecules through pores  A. Terrence Conlisk (Ohio State University)  
Speed of KPP fronts with a cutoff: rigorous results  M. Cristina Depassier (Pontificia Universidad Catolica de Chile)  
Twophase flow diffuse interface models for dynamic electrowetting  Marco Antonio Fontelos (Consejo Superior de Investigaciones Científicas (CSIC)) Günther Grün (FriedrichAlexanderUniversität ErlangenNürnberg)  
Dielectrophoretic deflection and rebound of continuous droplet streams  Thomas B. Jones (University of Rochester)  
Interfacial dynamics of colloidal particles in electrokinetically driven flows measured by multilayer nanoparticle image velocimetry (MnPIV)  Yutaka Kazoe (Georgia Institute of Technology)  
Influence of ion sterics and hydrodynamic slip on electrophoresis of a colloidal particle  Aditya Satish Khair (University of California, Santa Barbara)  
Stretch dependency of the electrophoretic mobility of DNA  Ronald G. Larson (University of Michigan)  
Wetting transition, drop impact, and microfow on hydrophobic microstructures  Detlef Lohse (Universiteit Twente)  
A fluid mechanical origin of sheet ejection during droplet impacting a dry surface  Shreyas Mandre (Harvard University)  
Surface charge measurement and control by gate voltage in electroosmotic flow  Frieder Mugele (Universiteit Twente)  
High order quadratures for the evaluation of interfacial velocities in axisymmetric Stokes flows  Monika Nitsche (University of New Mexico)  
Locomotion of synthetic nanomotors  Jonathan D. Posner (Arizona State University)  
Travelingwave electroosmosis and faradaic currents: the diffusion layer  Antonio Ramos (University of Sevilla)  
Multiphysics computational models for neurochip simulation  Riccardo Sacco (Politecnico di Milano)  
Hydrodynamic trap for single cells, particles and molecules  Charles M. Schroeder (University of Illinois at UrbanaChampaign)  
Free energy landscaping: Nanotopographic control over DNA conformations and transport  Derek Stein (Brown University)  
A diffusive interface method of modeling mutliphase flows  Huan Sun (Pennsylvania State University)  
Electric field gradient focusing in microchannels with embedded bipolar electrode  Ulrich Tallarek (PhilippsUniversität Marburg)  
Dynamics of drops and vesicles in electric fields  Petia M. Vlahovska (Dartmouth College)  
Understanding electrokinetics at the nanoscale: Beyond the limiting current  Gilad Yossifon (TechnionIsrael Institute of Technology) 
All Day  Chair: Martin Z. Bazant (Massachusetts Institute of Technology)  W12.711.09  
8:30am9:00am  Coffee  EE/CS 3176  W12.711.09  
9:00am9:40am  Migration of ionexchange particles under the action of a uniformly applied electric field  Ehud Yariv (TechnionIsrael Institute of Technology)  EE/CS 3180  W12.711.09 
9:40am10:20am  Making small things  Jens Eggers (University of Bristol)  EE/CS 3180  W12.711.09 
10:20am10:50am  Coffee break  EE/CS 3176  W12.711.09  
10:50am11:30am  The microfluidics of colloidal particlevesiclecapsule mixtures with application to blood additives  Eric S. G. Shaqfeh (Stanford University)  EE/CS 3180  W12.711.09 
11:30am1:30pm  Lunch  W12.711.09  
1:30pm2:10pm  DNA dynamics in confinement and complex electric fields  Patrick S. Doyle (Massachusetts Institute of Technology)  EE/CS 3180  W12.711.09 
2:10pm2:50pm  Nonuniform interfacial colloidal tracer distributions and implications for microscale PIV  Minami Yoda (Georgia Institute of Technology)  EE/CS 3180  W12.711.09 
2:50pm3:20pm  Coffee break  EE/CS 3176  W12.711.09  
3:20pm4:00pm  Nematic liquid crystals in thin geometries  Linda J. Cummings (New Jersey Institute of Technology)  EE/CS 3180  W12.711.09 
4:00pm4:30pm  Second chances  EE/CS 3180  W12.711.09 
All Day  Chair: Todd Squires (University of California, Santa Barbara)  W12.711.09  
8:30am9:00am  Coffee  EE/CS 3176  W12.711.09  
9:00am9:40am  Impact figures  David Quéré (École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI))  EE/CS 3180  W12.711.09 
9:40am10:20am  Hydrodynamics challenges in inkjet printing  Detlef Lohse (Universiteit Twente)  EE/CS 3180  W12.711.09 
10:20am10:50am  Coffee break  EE/CS 3176  W12.711.09  
10:50am11:30am  The electromechanics of liquids  Thomas B. Jones (University of Rochester)  EE/CS 3180  W12.711.09 
11:30am1:30pm  Lunch  W12.711.09  
1:30pm2:10pm  Dynamics of lipid bilayer membranes  Michael J. Miksis (Northwestern University)  EE/CS 3180  W12.711.09 
2:10pm2:50pm  Energetic variational approaches in calcium and sodium channels  Chun Liu (University of Minnesota)  EE/CS 3180  W12.711.09 
2:50pm3:20pm  Coffee break  EE/CS 3176  W12.711.09  
3:20pm4:00pm  Electrokinetic ion transport and liquid flux across nanochannels  HsuehChia Chang (University of Notre Dame)  EE/CS 3180  W12.711.09 
4:00pm4:30pm  Second chances  EE/CS 3180  W12.711.09 
All Day  Chair: Ali Nadim (Claremont Graduate University)  W12.711.09  
8:30am9:00am  Coffee  EE/CS 3176  W12.711.09  
9:00am9:40am  Electrical streaming potential generated by 2phase flow  John D. Sherwood (University of Cambridge)  EE/CS 3180  W12.711.09 
9:40am10:20am  Vesicles and red blood cells under shear and Poiseuille flow  Chaouqi Misbah (Université de Grenoble I (Joseph Fourier))  EE/CS 3180  W12.711.09 
10:20am10:50am  Coffee break  EE/CS 3176  W12.711.09  
10:50am11:30am  Countering capillarity with electrokinetics: from micromanipulation to Debyelayer diagnostics  Paul H. Steen (Cornell University)  EE/CS 3180  W12.711.09 
11:30am1:30pm  Lunch  W12.711.09  
1:30pm2:10pm  Extended space charge effects in concentration polarization  Isaak Rubinstein (Ben Gurion University of the Negev)  EE/CS 3180  W12.711.09 
2:10pm2:40pm  Coffee break  EE/CS 3176  W12.711.09  
2:40pm3:20pm  Adventures in self assembly  Michael P. Brenner (Harvard University)  EE/CS 3180  W12.711.09 
3:20pm3:50pm  Second chances  EE/CS 3180  W12.711.09  
6:30pm8:30pm  Workshop Dinner at Caspian Bistro  Caspian Bistro 2418 University Ave SE Minneapolis, MN 55414 6126231133 
W12.711.09 
All Day  Chair: Susan J. Muller (University of California, Berkeley)  W12.711.09  
8:30am9:00am  Coffee  EE/CS 3176  W12.711.09  
9:00am9:40am  Scaling arguments for tipstreaming of submicron droplets  Shelley L. Anna (Carnegie Mellon University)  EE/CS 3180  W12.711.09 
9:40am10:20am  Ion transport through nanopores: From living cells to diodes and transistors  Zuzanna S. Siwy (University of California, Irvine)  EE/CS 3180  W12.711.09 
10:20am10:50am  Coffee break  EE/CS 3176  W12.711.09  
10:50am11:30am  The influence of boundaries on shear banding in complex fluids  Peter D. Olmsted (University of Leeds)  EE/CS 3180  W12.711.09 
11:30am12:00pm  Second chances/closing remarks  EE/CS 3176  W12.711.09 
2:30pm3:20pm  Topics in the theory of the NavierStokes equations  Vladimir Sverak (University of Minnesota)  Lind Hall 305 
11:15am12:15pm  The optimal size for space discretization in spatially nonuniform reactiondiffusion systems  HyeWon Kang (University of Minnesota)  Lind Hall 305  PS 
2:30pm3:20pm  Topics in the theory of the NavierStokes equations  Vladimir Sverak (University of Minnesota)  Lind Hall 305 
1:25pm2:25pm  Research in applied mathematics at Schlumberger  Lalitha Venkataramanan (SchlumbergerDoll)  Vincent Hall 570  IPS 
All Day  Floating holiday. The IMA is closed. 
All Day  Christmas Day. The IMA is closed. 
Event Legend: 

IPS  Industrial Problems Seminar 
PS  IMA Postdoc Seminar 
T12.56.09  Mathematics of Microfluidic Transport Phenomena 
W12.711.09  Microfluidics: Electrokinetic and Interfacial Phenomena 
Second chances  
Abstract: No Abstract  
Second chances  
Abstract: No Abstract  
Second chances  
Abstract: No Abstract  
Second chances  
Abstract: No Abstract  
Second chances/closing remarks  
Abstract: No Abstract  
Shahriar Afkhami (New Jersey Institute of Technology)  Numerical simulations of dynamic wetting 
Abstract: With miniaturization of fluidic devices, smallscale effects such as the details of the flow near the contact line become important. We present a threedimensional numerical model to simulate the dynamic behavior of moving contact line phenomena. The model consists of an adaptive mesh discretization of the timedependent NavierStokes equations for incompressible twophase flows with a volumeoffluid technique for interface tracking. Equilibrium results of threedimensional droplets with various contact angles are presented and compared with known solutions. The slip of a moving contact line on the solid surface and the dynamical contact angle are computationally investigated. Some numerical simulations of the model applied to electrowetting are presented.  
Shelley L. Anna (Carnegie Mellon University)  An Introduction to interfaces and multiphase flows in microfluidics 
Abstract: No Abstract  
Shelley L. Anna (Carnegie Mellon University)  Scaling arguments for tipstreaming of submicron droplets 
Abstract: Microfluidic devices are convenient for producing highly uniform droplets for precise emulsions and labonachip devices. However, the minimum droplet size in a microfluidic process is determined by the smallest geometric feature size, typically on the order of tens of microns. Introducing additional physicochemical effects can help overcome this fundamental limitation. For example, when dissolved surfactants are present in one of the liquid phases, a tipstreaminglike phenomenon occurs, leading to the formation of submicron droplets. We have characterized this phenomenon in detail as a function of fluid properties and flow kinematics. However, we still have only a phenomenological understanding of the role of surfactant in the tipstreaming process. Experiments and recent literature suggest that the adsorption and desorption of surfactants at the interface plays an important role. In this talk, we demonstrate the feasibility of this hypothesis via scaling arguments for the diffusion, adsorption, and desorption of soluble surfactants in micronscale geometries.  
Paul J. Atzberger  Particle separation by capillary electrophoresis in nanochannels 
Abstract: We discuss an ongoing theoretical / experimental effort studying particle separation through capillary electropohoresis in nanochannels. Recent experimental results in the laboratory of Dr. Pennathur (UCSB, Dept. ME) indicate that increased fidelity in separating particles by size and charge can be achieved when using channels with cross sections of nanometer dimensions (100nm x 1000nm) as opposed to larger microchannels. For short doublestrands of DNA (10  100 base pairs) it is found that separation in free solution produces only one lumped peak in the fluorescence signal for microchannels but several clearly distinct peaks in nanochannels. Many effects which are weak in microchannels are expected to play a strong role in nanochannels owing to the large surface area to volume ratio and steric restrictions imposed on particle configurations. Models are presented for separation which investigate the role of the particleparticle and particlewall steric interactions, the hydrodynamic flow and coupling, the overlap of double layers, and the translational and rotational diffusion of particles. This work is also being carried out with Dr. Gibou (UCSB, Dept. ME) and with the graduate student David Boy.  
Martin Z. Bazant (Massachusetts Institute of Technology)  Inducedcharge electrokinetics 
Abstract: No Abstract  
Michael P. Brenner (Harvard University)  Adventures in self assembly 
Abstract: Self assembly is the idea of creating a system whose component parts spontaneously assemble into a structure of interest. In this talk I will outline our research program aimed at creating selfassembled structures out of very small spheres, that bind to each other on sticking. The talk will focus on (i) some fundamental mathematical questions in finite sphere packings (e.g. how do the number of rigid packings grow with N, the number of spheres); (ii) algorithms for self assembly (e.g. suppose the spheres are not identical, so that every sphere does not stick to every other; how to design the system to promote particular structures); (iii) physical questions (e.g. what is the probability that a given packing with N particles forms for a system of colloidal nanospheres); (iv) comparisons with experiments on colloidal nanospheres. and (v) ways of using microfluidics to enable kinetically driven self assembly.  
Henrik Bruus (Technical University of Denmark)  Strongly nonlinear dynamics of electrolytes in large ac voltages 
Abstract: Preprint (ArXiv)
We study the response of a model microelectrochemical cell to a large
ac voltage of frequency comparable to the inverse cell relaxation time.
To bring out the basic physics, we consider the simplest possible model
of a symmetric binary electrolyte confined between parallelplate
blocking electrodes, ignoring any transverse instability or fluid flow.
We analyze the resulting onedimensional problem by matched asymptotic expansions in the limit of thin double layers and extend previous work into the strongly nonlinear regime, which is characterized by two novel features (1) significant salt depletion in the electrolyte near the electrodes and (2), at very large voltage, the breakdown of the quasiequilibrium structure of the double layers. The former leads to the prediction of "ac capacitive desalination", since there is a timeaveraged transfer of salt from the bulk to the double layers, via oscillating diffusion layers. The latter is associated with transient diffusion limitation, which drives the formation and collapse of spacecharge layers, even in the absence of any net Faradaic current through the cell. We also predict that steric effects of finite ion sizes (going beyond dilute solution theory) act to suppress the strongly nonlinear regime in the limit of concentrated electrolytes, ionic liquids and molten salts. Beyond the model problem, our reduced equations for thin double layers, based on uniformly valid matched asymptotic expansions, provide a useful mathematical framework to describe additional nonlinear responses to large ac voltages, such as Faradaic reactions, electroosmotic instabilities, and inducedcharge electrokinetic phenomena. 

Thomas P. Burg (MaxPlanckInstitut für Biophysikalische Chemie)  Nonmonotonic energy dissipation in microfluidic cantilever resonators 
Abstract: Nanomechanical resonators enable a range of precision measurements in air or vacuum, but strong viscous damping makes applications in liquid challenging. Recent experiments have shown that fluid damping can be greatly reduced by confining the sample to a fluidic channel embedded inside the resonator while the outside is under vacuum. Understanding fluid damping in such systems is critical for future applications to problems spanning a wide range of scales in nanoscience and biology. Measurements presented here reveal that energy dissipation in cantilevers with embedded fluidic channels is a nonmonotonic function of viscosity, suggesting that the quality factor may actually be enhanced through miniaturization. These results are found to be consistent with a firstorder hydrodynamic model of the fluidfilled vibrating cantilever beam. In the regime of lowviscosity, inertia dominates the fluid motion inside the cantilever, resulting in thin viscous boundary layers  this leads to an increase in energy dissipation with increasing viscosity. In the highviscosity regime, the boundary layers on all surfaces merge, leading to a decrease in dissipation with increasing viscosity. Effects of fluid compressibility also become significant in this latter regime and lead to rich flow behaviour. Based on these results, we anticipate that scaling of current devices by more than tenfold may be possible without significant degradation of the quality factor due to damping induced by the fluid.  
HsuehChia Chang (University of Notre Dame)  Electrokinetic ion transport and liquid flux across nanochannels 
Abstract: Keywords: electrokinetics, nanoscience, limiting current, Donnan potential, ion selectivity, Warburg Impedance Abstract: With the advent of nanofabrication technologies, nanochannels with dimensions smaller than the Debye screening layer can now be fabricated to allow scrutiny of the various anomalous DC and AC IV characteristics of ionselective membranes at the singlepore level — such knowledge is essential for rapid DNA sequencing, singlemolecule sensing/identification and plasmonic imaging in nanoscience. Combining theoretical analyses of the underlying ion/solvent fluxes and confocal imaging of velocity and ion concentration fields, we explore the fundamental mechanisms behind nonideal selectivity, Donnan potential, asymmetric depletion/enrichment layer formation, limiting and overlimitingcurrent, diodelike rectification, Warburg impedance response, interchannel communication etc. Curiously, hydrodynamic effects at the depletion end of the channel is found to control many of the nonOhmic behavior at higher voltages. Interfacial vortices created by an osmotic pressure driven instability (first predicted by I. Rubinstein) and induced charges at the corners of nanopores are found to specify the overlimiting current, the rectification factor and interpore communication. The intensity of these vortices and their influence on the ioncarried currents are found to be strongly dependent on the pore/reservoir geometries and can be described by limiting fundamental solutions of the Laplace and Stokes equations due to severe electric and flow field focusing into the nanochannel.  
Greg P. Chini (University of New Hampshire)  Capillarydriven thinfilm flows on stationary and periodicallystretched substrates having isolated topographic features 
Abstract: The capillarydriven readjustment of thin liquid films subject to sudden, localized changes in shape or to periodic stretching of adjacent solid surfaces is important in a variety of industrial and physiological flow configurations. To investigate this process, we perform a combination of finitedifference numerical simulations and matched and multiplescale asymptotic analyses of several related, simplified models. Thin films readjusting near isolated interior corners or "large" humps generically attain an intermediateasymptotic state consisting of a corner puddle, a "JonesWilson" (or "Hammond") draining region, through which fluid slowly drains into the puddle, and a farfield, propagating capillary wave. (For thinfilm flows near "small" humps, the capillary wave attaches directly to the hump.) In the presence of distant lateral noflux boundaries, the thin film ultimately reaches a quasisteady configuration consisting of a droplet, a JonesWilson draining region, and a corner puddle, as has long been known. This quasisteady film distribution is dramatically altered by the introduction of prescribed substrate stretching. At low frequencies, the pressure distribution becomes nonmonotonic and the drainage region is rendered passive. A "Bretherton" region, which connects the corner puddle to a wedgelike region emerges, and dragout and dragin profiles are asymmetric. At high frequencies, the effects of the pressure oscillation are screened in a small neighborhood of the corner. This work is motivated by applications in pulmonary alveolar mechanics.  
Tom Chou (University of California, Los Angeles)  Enhancement of charged macromolecule capture by nanopores in a salt gradient 
Abstract: An theoretical analysis is performed to explain recently observations that salt gradients across a nanopore can increase charged analyte capture rates.  
A. Terrence Conlisk (Ohio State University)  Micro and nanoscale transport of biomolecules through pores 
Abstract: Computational and theoretical models are developed for the transport of biomolecules and electrostatic and electrokinetic phenomena in nanopore membranes. For the application of nanopore sequencing, the electrophoretic transport of double stranded DNA molecules through a converging nanopore is investigated. The forces that affect the DNA translocation are analyzed and the DNA translocation velocity is predicted. The computational model is validated by good agreement between the computational results and the experimental data. Motivated by the design requirements for a hemofilter in an implantable artificial kidney, the hindered transport of biomolecules through a nanopore membrane is studied, particularly for the selectivity of the charged membrane to charged biomolecules of biological interest, particularly human serum albumin. The developed theory is applied to the problem of choosing a hemofilter pore size that provides adequate retention/clearance of desirable/undesirable solutes from blood.  
Linda J. Cummings (New Jersey Institute of Technology)  Nematic liquid crystals in thin geometries 
Abstract: Keywords: Nematic Liquid Crystal, nonNewtonian, lubrication theory, asymptotics, electric field effects, interfacial instability, free boundary problem, LCD Abstract: Nematic liquid crystals are materials intermediate between the liquid and solid states. They are typically composed of long, rodlike molecules, which have a tendency to align with their neighbors, imparting a shortrange (but no longrange) orientational order  although nematics flow, like conventional liquids, they also retain some elastic character. This gives rise to complex behavior that does not arise in Newtonian liquids. Moreover, their response to an applied electric field gives nematics wide application in the electronic display industry. We consider mathematical models for three different problems. Two are classical fluiddynamical setups: a small droplet spreading on a flat substrate; and a twodimensional "liquid bridge" (or liquid sheet) under tension. These are free boundary problems, and the thin geometry in each case enables the use of "lubrication" analysis to systematically derive reduced mathematical models governing the free surface evolution. The spreading drop analysis leads to variants of the classical 4th order "thin film" equation, which can exhibit instability in certain regimes. The "liquid bridge" problem leads to new versions of the socalled Trouton model for Newtonian viscous sheets. The third problem arises in the display industry, and is concerned with manufacturing a "bistable" display device, that can exhibit two opticallydistinct configurations in the absence of an electric field. Such a device has the potential for considerably reducing the power demands of a display, with accompanying benefits for battery lifetime and device portability.  
M. Cristina Depassier (Pontificia Universidad Catolica de Chile)  Speed of KPP fronts with a cutoff: rigorous results 
Abstract: We study the reaction diffusion equation u_{t} = u_{xx} + f(u), with a cutoff ε in the reaction term. The reaction term without a cutoff is assumed to be of KPP type. The introduction of the cutoff on the reaction term has been shown to model the effect of noise and the finiteness of the number of diffusing particles. Rigorous bounds on the speed are given for arbitrary values of ε. For small cutoff the BrunetDerrida value is recovered, the bounds from allow to determine its range of validity. In the opposite limit of large cutoff the speed tends to zero as the square root of (1ε). The results are obtained making use of a variational characterization of the speed.  
Kevin D. Dorfman (University of Minnesota)  DNA electrophoresis in microfabricated arrays 
Abstract: Keywords: Brownian dynamics, microfabrication, boundary element method, DNA electrophoresis, separations Abstract: I will present our recent results on the dynamics of long DNA as they move through a hexagonal arrays of microfabricated posts under the influence of an electric field. The first part of the talk focuses on the potential of using sparse, ordered post arrays to separate long DNA by molecular weight. In particular, I will focus on the crucial role of electric field gradients on the separation process and how we can use microfabrication tools to control these gradients. In the second part of the talk, I will demonstrate how we are using a combination of Brownian dynamics simulations and videomicroscopy to gain a detailed understanding of the separation process at the macromolecular level.  
Patrick S. Doyle (Massachusetts Institute of Technology)  DNA dynamics in confinement and complex electric fields 
Abstract: Keywords: DNA, microfluidic, nanofluidic, electrophoresis Abstract: Large double stranded DNA are both a powerful system to study polymer dynamics at the single molecule level and also important molecules for genomic applications. While homogenous electric fields are routinely used to separate DNA in gels, DNA deformation in more complex fields has been less widely studied. We will demonstrate how micro/nanofluidic devices allow for the generation of electric fields with welldefined kinematics for trapping, stretching and then watching DNA relax back to equilibrium. The dimensions of the devices highly confine DNA and subsequently change both their conformation and dynamics. First, I will discuss how confinement changes the conformational relaxation time and introduces new relaxation regimes not seen in bulk. Next, I will show how these confinements effects change the coilstretch transition of a DNA being electrophoretically stretched in a purely elongational electrical field.  
Jens Eggers (University of Bristol)  Making small things 
Abstract: Keywords: Singularities, Free surface flows Abstract: Viscous flow is extremely effective in deforming a free surface into very sharp features such as tips or cups. Under increased driving such free surface singularities may turn unstable, and give way to secondary structures. In particular, this may be turned into a method to "manufacture" small things by using the nonlinear character of the equations of hydrodynamics.  
Marco Antonio Fontelos (Consejo Superior de Investigaciones Científicas (CSIC)), Günther Grün (FriedrichAlexanderUniversität ErlangenNürnberg)  Twophase flow diffuse interface models for dynamic electrowetting 
Abstract: We present thermodynamically consistent models for dynamic electrowetting and other electrokinetic phenomena involving conductive liquids or electrolyte solutions. They combine NavierStokes equations, evolution equations for ion/charge densities and for phase field with an elliptic transmission problem forthe electrostatic potential. We provide numerical and theoretical argumentsi ndicating that microscopically Young's contact angle persists in equilibrium configurations. Moreover, the models allow for contactangle hysteresis. In addition, 2D and 3D numerical simulations on electric field induced droplet motion are presented. Finally, rigorous mathematical analysis shows globalintime existence of solutions to the models under consideration.  
Sandip Ghosal (Northwestern University)  Electroosmotic flow and dispersion in microfluidics 
Abstract: No Abstract  
Thomas B. Jones (University of Rochester)  The electromechanics of liquids 
Abstract: Keywords: dielectrophoresis, electrowetting, electromechanics, microfluidics Abstract: When subjected to electric fields, liquids exhibit a large range of dynamic and kinematic phenomena. This lecture focuses on the liquid electromechanical effects commonly exploited to dispense, move, and manipulate small liquid masses (including droplets) in microfluidic applications. Irrespective of the fine details, the net, observable force interaction very often can be predicted in terms of an appealingly simple, lumped parameter model. In particular, as long as the capacitance of a microfluidic structure can be expressed in terms of a small number of mechanical variables that adequately describe liquid displacement and distortion, then an electromechanical system model is born. Because such models can describe the important fluid behavior of insulating and conductive liquids, microfluidic schemes based on either liquid dielectrophoresis, electrowettingondielectric, or a combination of the two can be treated. The lumped parameter approach avoids issues associated with volume force densities and often circumvents the need for numerical electric field computations.  
Thomas B. Jones (University of Rochester)  Dielectrophoretic deflection and rebound of continuous droplet streams 
Abstract: Joint work with Paul Chiarot (Department of Electrical and Computer Engineering, University of Rochester). In continuous ink jet systems, streams of ~10 picoliter liquid droplets (diameter ~30 microns) are ejected from an array of orifices at rates of up to 350,000 per second and velocities in excess of 20 m/s. Applications as diverse as printing, microfabrication, and microarraying benefit from this technology; however, reliable manipulation of the jet, including basic on/off control and steering of droplet streams and individual liquid droplets, remains difficult to achieve. We have developed a novel deflection scheme to manipulate the trajectories of droplets rebounding at shallow angles from a solid substrate based on the dielectrophoretic force exerted by patterned electrodes. Droplet rebound, key to the performance of this scheme, has been investigated for both fluorocarbon (Teflon) and superhydrophobic surface coatings. Our experiments reveal interesting droplet behavior, and at least two regimes of operation, that are dependent on the Weber number and on the properties of the solid surface with which the droplets collide and rebound. This work was supported by a grant from Eastman Kodak Co. in Rochester, NY (USA).  
HyeWon Kang (University of Minnesota)  The optimal size for space discretization in spatially nonuniform reactiondiffusion systems 
Abstract: In this talk, I will discuss how to discretize space to model stochastic reactiondiffusion systems. A system with chemical reactions and diffusion is modeled using a continuous time Markov jump process. Diffusion is described as a jump to the neighboring compartments with proper spatial discretization. Considering stationary mean and variance of each species in each compartment, the optimal size for spatial discretization will be suggested. Then, I will show criteria to discretize the corresponding deterministic reactiondiffusion equation for concentration of species. The optimal size for spatial discretization obtained from the deterministic case coincides with the result of the stochastic case. This is a joint work with Hans Othmer and Likun Zheng.  
Yutaka Kazoe (Georgia Institute of Technology)  Interfacial dynamics of colloidal particles in electrokinetically driven flows measured by multilayer nanoparticle image velocimetry (MnPIV) 
Abstract: The transport and dynamics of colloidal particles near a solidliquid interface (i.e., the wall) is important in many microfluidic applications, including microscale particleimage velocimetry (PIV). Experimental studies using total internal reflection microscopy to study nearwall colloidal particle dynamics have for the most part only considered a single particle in a quiescent fluid. In contrast, our group has developed an evanescent wavebased technique that analyzes the dynamics of ensembles of up to O(10^{5}) nearwall colloidal tracers, multilayer nanoparticle image velocimetry (MnPIV). The technique exploits the exponentially decaying intensity of evanescentwave illumination, to extracts nearwall particle distributions and flow velocities at different distances from the wall, all within about 500 nm of the wall. The technique has already been validated for steady and creeping Poiseuille flow, where the shear rates were found to be within about 5% of analytical predictions. In this study, we use MnPIV to investigate electrokinetically driven flows through fusedsilica microchannels about 40 microns deep. The results for 100 nm to 500 nm diameter tracers show that the flows are uniform with constant electroosmotic mobility, and that the Brownian diffusion coefficients for tangential fluctuations are within 7% of the Faxén relation. The particle distributions near the wall are, however, in all cases, highly nonuniform, with very few particles within 100 nm of the wall due to electrostatic and van der Waals effects. Finally, the nearwall distribution of the 500 nm tracers are shown to vary with applied electric field, due presumably to dielectrophoresis and perhaps inducedcharge electroosmosis.  
Aditya Satish Khair (University of California, Santa Barbara)  Influence of ion sterics and hydrodynamic slip on electrophoresis of a colloidal particle 
Abstract: The classical theory of a spherical colloids' electrophoretic mobility is founded on the PoissonNernstPlanck (PNP) equations and assumes the standard hydrodynamic noslip boundary condition at the fluid/solid interface. In the (common) limit of thin doublelayers, the mobility has long been known to exhibit a maximum at some zeta potential, then decrease and asymptote to a constant value. Dukhin, O'Brien, White and others showed this to result from the importance of excess ionic surface conductivity within the doublelayer. The fundamental assumptions that underpin this result are, however, subject to challenge: in recent years, a finite liquid/solid slip has been measured over a variety of surfaces, and the PNP equations predict physically impossible ion concentrations precisely at the high zeta potentials where the mobility maximum occurs. Here, we discuss the dramatic effect that hydrodynamic slip and finiteionsize steric effects in doublelayers have upon the electrophoretic mobility of spherical colloids, and therefore upon the interpretation of electrophoretic mobility measurements.  
Ronald G. Larson (University of Michigan)  Stretch dependency of the electrophoretic mobility of DNA 
Abstract: We develop a theory on DNA electrophoresis that shows stretchdependent electrophoretic mobility in agreement with an experiment observation. In our theory, a DNA molecule is modeled as a freelyjointedchain, each of whose segments consists of a collinear series of charged spheres, which we call a "shishkebab" segment. First, by calculating the interaction between charged spheres in an electric field, we show that the electrophoretic mobility of a shishkebab segment is dependent on the orientation relative to the direction of the electric field. Then, the electrophoretic mobility of the whole DNA chain is evaluated by taking an ensemble average over the orientation of the shishkebab segments in the chain. The result shows an enhancement of the magnitude of the electrophoretic mobility under the stretch of the DNA molecule.  
Reinhard Lipowsky (Max Planck Institute for Colloids and Interfaces)  Wetting of structured substrates and flexible membranes 
Abstract: Keywords: Wetting phenomena, surface domains, surface topography,
contact line pinning, fluid membranes, vesicles, intrinsic contact angles
Abstract: Two types of wetting phenomena will be discussed: (i) Morphological wetting
transitions at chemically patterned or topographically structured substrates; and
(ii) Wetting of flexible membranes such as lipid bilayers by aqueous phases.
Morphological wetting transitions between different droplet shapes occur, e.g., as one
varies the amount of liquid deposited on the structured substrate. [1,2] The basic
mechanism underlying this polymorphism is the freedom of contact angles at pinned
contact lines. [3] The second system consists of lipid vesicles containing aqueous
solutions with two species of watersoluble polymers. When the polymer concentrations
are raised by deflation, the aqueous solution forms two coexisting liquid phases that
may undergo completetopartial wetting transitions at the vesicle membranes. [4] Partial
wetting is characterized by effective contact angles that can be measured by optical
microscopy and by an intrinsic contact angle that represents a 'hidden' material parameter. [5]
[1] R. Seemann et al. PNAS 102, 1848 (2005) [2] P. Blecua, M. Brinkmann, R. Lipowsky, and J. Kierfeld. Langmuir (in press) [3] R. Lipowsky et al. J. Phys.: Condens. Matter 17, S2885 (2005) [4] Y.H. Li, R. Lipowsky, and R. Dimova. JACS 130, 12252 (2008) [5] H. Kusumaatmaja, Y.H. Li, R. Dimova, and R. Lipowsky. Phys. Rev. Lett. (submitted) 

Chun Liu (University of Minnesota)  Energetic variational approaches in calcium and sodium channels 
Abstract: Keywords: Energetic Variational Approaches, ion channels, complex fluids Abstract: Ion channels are key components in a wide variety of biological processes, such as nerve impulse, cardiac and muscle contraction, regulating the secretion of hormones into the bloodstream. Ion channels are a frequent target in the search of new drugs. Ion channels, like enzymes, have their specific properties: potassium, sodium, calcium, and chloride channels allow only that type of ions to move through the pores. This selectivity is the key to all those biological process mentioned above. Selectivities in both calcium and sodium channels can be described by the reduced models, taking into consideration of dielectric coefficient and ion particle sizes, as well as their very different primary structure and properties. The sidechains are represented only as charged spheres (calcium channel EEEA/EEEE; sodium channel DEKA). These selforganized systems will be modeled and analyzed with energetic variational approaches (EnVarA) that were motivated by classical works of Rayleigh and Onsager. The resulting/derived multiphysicsmultiscale systems automatically satisfy the Second Laws of Thermodynamics and the basic physics that are involved in the system, such as the microscopic diffusion, the electrostatics and the macroscopic conservation of momentum, as well as the physical boundary conditions. In this talk, I will discuss the some of the related biological, physics, chemistry and mathematical issues. This is a joint work with Bob Eisenberg (Rush) and Yunkyong Hyon (IMA).  
Detlef Lohse (Universiteit Twente)  Hydrodynamics challenges in inkjet printing 
Abstract: Keywords: inkjet printing, bubbles, drop formation, air entrainment, impact
Abstract:
Piezoacoustic inkjet printing has become a mature technique for high performance printing. Nevertheless, there are still various scientific challenges. In this overview talk I will cover some of them:
(i) Coupling between the fluid dynamics and the acoustics, in particular when a disturbing bubble has been entrained in the ink channel. (ii) Optical and acoustical monitoring of the bubble. (iii) Mechanisms of the bubble entrainment. (iv) Droplet formation and pinchoff of droplets. (v) Droplet impact on substrates. Main further contributors to the research: Jos de Jong, Roger Jeurissen, Arjan van der Bos, Michel Versluis, and the colleagues from Oce Technologies: Hans Reinten, Herman Wijshoff, and Marc van der Berg. 

Detlef Lohse (Universiteit Twente)  Wetting transition, drop impact, and microfow on hydrophobic microstructures 
Abstract: Joint work with
Peichun Amy Tsai^{1}, Christophe Pirat^{1}, Alisia M. Peters^{2}, Rob Lammertink^{2},
Matthias Wessling^{2},
Sergio Pacheco^{3} and Leon
Lefferts^{3}.
The poster presents several different wetting phenomena on
structured and unstructured superhydrophobic surfaces, namely
(i) an evaporation triggered wetting transition, at which a
drop
on a structured surface jumps from the CassieBaxter state to
the
Wenzel state,
(ii) a drop impact on carbon nanofiber jungles, for which
eithers droplet
rebound or splashes are achieved, depending on the impact
velocity, and
(iii) the measurement of the effective sliplength over
microgrooves
through microPIV.
^{1}Physics of Fluids Group, ^{2}Membrane Technology Group, ^{3}Catalyst Materials and Process Group, University of Twente, the Netherlands 

Shreyas Mandre (Harvard University)  A fluid mechanical origin of sheet ejection during droplet impacting a dry surface 
Abstract: No abstract  
Vasileios Maroulas (University of Minnesota)  Variational representations, small noise large deviations and applications 
Abstract: Variational representations for infinite dimensional Brownian motions and Poisson random measures are considered in order to establish small noise (uniform) large deviations. Using this approach, a large deviation principle for a class of stochastic reactiondiffusion equations is established under conditions that are substantially weaker than those available in the literature, and large deviation estimates for a family of infinite dimensional stochastic flows of diffeomorphisms that arise in certain image analysis problems are demonstrated. The small noise large deviations results for the stochastic diffeomorphic flows are then applied to a stochastic Bayesian formulation of an image matching problem, and an approximate maximum likelihood property is shown for the solution of an optimization problem involving the large deviations rate function. This talk is based on joint works with A. Budhiraja and P. Dupuis.  
Michael J. Miksis (Northwestern University)  Dynamics of lipid bilayer membranes 
Abstract: The dynamics of a lipid bilayer membrane is investigated in several different situations. Our model accounts for the transport of lipids along each monolayer, and intermonolayer friction, as well as the membrane fluidity and resistance to bending. First we consider a nearlyspherical vesicle in a shear flow. In this nearspherical limit we can reduce the model to a nonlinear coupled system of equations for the dynamics of the shape and the bilayer density difference. Multiple solution states are found as a function of viscosity ratio and the monolayer slip coefficient. Second, we investigate the stability of a planar membrane subjected to a DC electric pulse. The thin lipid membrane is impermeable to ions and thus acts as a capacitor. A linear stability analysis results in a time dependent system of equations for the growth rate as a function of wave number. Our theoretical findings are relevant to understanding the physical mechanisms of electroporation of biomembranes. Finally we discuss a novel computational method to determine the dynamics of a lipid bilayer vesicle in a viscous flow.  
Chaouqi Misbah (Université de Grenoble I (Joseph Fourier))  Vesicles and red blood cells under shear and Poiseuille flow 
Abstract: Keywords: Blood flow, microcirculation, modeling, rheology Abstract: Various rich dynamics of vesicles under linear and nonlinear flows will be discussed. We present analytical and numerical results on tanktreading motion, tumbling and vacillatingbreathing (aka swinging, trembling). We then discuss the notion of transverse migration due to a wall and to a nonlinear flow. We show theoretical and exeprimental results on the law of transverse migration in a microfluidic device. Finally, we present very recent results on a longstadning puzzle of the blood microcirculatory research: why do red blood cells adopt a non symmetric shape (called slipper) in small blood vessels? A key result of our study is that the parachute symmetric shape is shown to be unstable, while the slipper shape is stable. That is, small flow disturbances–which are always present in real blood flows–cause RBCs to assume slipper shapes. It is further shown that the slipper shape offers a better transport efficiency to RBCs. In addition the slipper shape favors hemoglobin mixing in the cell, and thus enhances oxygen transport efficiency. Blood flow efficiency together with optimal oxygen supply seem to be determinant for natural selection of slipper shapes.  
Frieder Mugele (Universiteit Twente)  Mixing and internal flows in drops in AC electrowetting 
Abstract: Keywords: Electrowetting, mixing, electrothermal flow Abstract: Mixing is a key issue in microfluidics, including dropletbased “digital” microfluidics. In electrowetting, internal flow patterns inside drops can be generated without any lateral translation if the drops are excited with AC voltage. Two regimes can be distinguished: at AC frequencies of the order of the eigenfrequency (typically O(1kHz) or less), the drops periodically oscillate between states of high and low contact angle. Despite the periodicity, there is a symmetry breaking in the drop shape between the spreading and the receding phase, which causes a timeaveraged net flow inside the drop that promotes mixing. This process can be described using a model based on capillary wavedriven Stokes drift. For somewhat higher frequencies, this mechanism becomes progressively inefficient, because the liquid cannot follow the applied voltage anymore. At substantially higher AC frequencies (typically >>10kHz, depending on the salt concentration), however, a new driving mechanism for internal flows sets in, as reported by Nichols and Gardniers (Anal. Chem. 79, 8699 (2007) and by Ko et al. (Langmuir 24, 1094, 2008). Under these conditions, the liquid no longer acts as a perfect conductor. The electric field penetrates into the drop and generates local Ohmic currents. These currents produce Joule heating and ultimately giving rise to electrothermal flows inside the drops. Solving numerically for the distribution of the electrostatic field, the flow field, and the temperature distribution, we show that the flow velocity scales with the fourth power over a wide range of both the applied voltage and the AC frequency – in good agreement with the experiments by Ko et al.  
Frieder Mugele (Universiteit Twente)  Surface charge measurement and control by gate voltage in electroosmotic flow 
Abstract: We present a simple analytical model that allows for determining the surface charge in electroosmotic flow channels using the socalled solution displacement method. In contrast to earlier techniques, which have either been limited to small ratios of salt concentration or required a numerical solution of the convectiondiffusion equation, our method provide a simple functional form with merely two fit parameters and thus allow for more accurate measurements of surface charge. Moreover, we demonstrate flow reversal inside our microfluidic channels controlled by gate electrodes underneath insulating layers that allow for external tuning of the surface charges. We discuss possible applications as a rheometer for applying shear forces to ultrasoft complex fluids.  
Susan J. Muller (University of California, Berkeley)  Confinement effects with macromolecules 
Abstract: No Abstract  
Ali Nadim (Claremont Graduate University)  Electrowetting and digital microfluidics 
Abstract: In this tutorial, a number of approaches to mathematical modeling of electrowettingondielectric (EWOD), also known as digital microfluidics (DMF) will be reviewed. EWOD refers to methods for causing droplets to move along solid surfaces or changing the shapes of attached drops (e.g., to actuate a liquid lens) by applying a potential difference between the drop and an underlying electrode, separated from the conducting drop via a thin dielectric layer. The main equation describing electrowetting is known as the YoungLippmann (YL) equation, which provides a relationship between the local contact angle of the drop and the square of the potential difference. In this tutorial, a simple derivation of the YL equation is provided based on an energy minimization principle. We will then introduce both lumped and field models to characterize the electrostatic forces acting on a drop as a function of its position relative to the underlying electrodes. The lumped model is based simply on treating the dielectric layer as a parallelplate capacitor and considering the changes in the energy of the system as a function of the location of the drop. The field model requires the use of concepts from electromechanics, including Maxwell's electric stress tensor. We will consider both DC and AC electric potentials and describe how to analyze the system in both cases.  
Monika Nitsche (University of New Mexico)  High order quadratures for the evaluation of interfacial velocities in axisymmetric Stokes flows 
Abstract: Boundary integral methods are computationally efficient in computing the evolution of interfaces in Stokes flow. For axisymmetric interfaces, they reduce to evaluating a 1d integral at each time step. We have performed a detailed analysis of the structure of the integrands and show that standard methods of integration present two difficulties. One arises from loss of precision due to cancellation, the other from singular behaviour of the integrands near the axis of symmetry. As a result, high order quadrature proposed previously for these types of integrals are not uniformly high order. Instead, the maximal errors are always of second order. We propose a remedy to both difficulties and present a uniformly accurate 5th order approximation. This new quadrature is implemented to evolve (1) an initially barbelled bubble that pinches at a point in finite time, and (2) a sphere in a strain flow that approaches a steady state. We compare the results with commonly used second order approximations and show that significant improvement is obtained using 5th order rules. The examples also illustrate when the corrections needed for uniformity have an impact in practice.  
Peter D. Olmsted (University of Leeds)  The influence of boundaries on shear banding in complex fluids 
Abstract: Keywords: shear banding, boundary conditions, flow instabilities, wormlike micelles Abstract: Shear banding fluids such as wormlike micelles, lamellar surfactant solutions, and emulsions, undergo "transitions" between fluids of different apparent viscosity as a function of applied flow conditions. This switching makes them appealing for use in microfluidic applications. Since their physics is controlled by the influence of flow on internal microstructure, which in turn is influenced by boundary effects, it is important to develop an understanding of how different kinds of boundary effects influence shear banding. In this talk I will discuss some of these issues, mainly using constitutive models inspired by experiments on wormlike micelles or polymer solutions. and explore the effects of different boundary conditions for the additional viscoelastic stress. These are needed because the equations of motion are inherently nonlocal and include “diffusive” or squaregradient terms. I will note some of the features expected to be important for microfluidic geometries. [Work done in collaboration with JM Adams and SM Fielding]  
Sumita Pennathur (University of California, Santa Barbara)  Electrokinetics in planar nanofluidic channels 
Abstract: Keywords: electrokinetics, nanofluidics, possionboltzmann, TIRFM Abstract: The advent of nanofabrication technologies allows for the development of robust nanoconfined fluidic channels. In this talk I will outline some recent advances and challenges in our research program aimed at elucidating linear and nonlinear electrokinetic phenomena within such channels. First, I will present a combined theoretical and experimental study of the dissolution of fused silica nanofluidic channels when subject to pressure driven flow of aqueous solutions. Time sensitive current measurements within these channels allow for determination of the dissolution rate from the classic linear PoissonBoltzmann equations for fluid flow and GouyChapmanSternGrahame charge regulation model for the surface boundary conditions. Next, I will describe a novel total internal reflectance microscopy (TIRFM) system we have developed and recent experimental results towards to the elucidation of coupled nanofluidic electrokinetic systems, namely, the addition of finite sized charged quantum dots and/or biomolecules on the order of the size of the channel. Finally, I will discuss some experimental nonlinear electricfield dependent phenomena observed around metal electrodes within a nanofluidic channel.  
Jonathan D. Posner (Arizona State University)  Locomotion of synthetic nanomotors 
Abstract: At ASU, we are investigating locomotion of bimetallic synthetic nanomotors that, analogous to their biological counterparts, harvest chemical energy from their local environment and convert it to useful work. Bimetallic nanorods can autonomously propel themselves at a hundred body lengths per second through aqueous solutions by using hydrogen peroxide as a fuel. Magnetic fields and electrochemically induced chemical species are used to control the motion of PtNiAu nanorods. We use the magnetic properties of nickelloaded nanomotors to control their motion through micronscale structures as well as the loading, transport, and release of spherical cargo that have volumes two orders of magnitude larger than the nanomotors itself. Nanomotor locomotion forces are determined by measuring their velocity while towing spherical cargo that have Stokes drag eight times the nanomotors themselves. Several physical arguments have been proposed to describe the physics underlying chemicallypowered locomotion, but there is no detailed theory on the propulsion mechanism. We are simulating the physics of rodshaped nanoparticles with asymmetric surface fluxes. Our models show that locomotion is driven by electric body forces in the fluid that arise due to finite space charge and internally generated electric fields surrounding the rod. The electric fields and charge density are generated by dipolar cation fluxes, such as those generated by heterogeneous electrochemical reactions with broken symmetry. The scaling analysis and detailed simulations predict that the nanomotor velocity depends on the reaction flux, nanorod electrical surface potential, solvent viscosity, and rod geometry.  
Manu Prakash (Harvard University)  Programmable soft matter 
Abstract: Our interests lie in exploiting physical fluidic mechanisms to program and control matter at small length scales. In the first part of the talk, I will describe a novel way to employ physical computation to build allfluidic control circuits. I will introduce how to build both "analog" and "digital" circuits that can implement universal Boolean logic, feedback, cascadability, bistability and synchronization via exploiting purely hydrodynamic nonlinearities in lowReynolds number multiphase flow. These circuits provide a means to control subnanoliter droplets in fluidic channels up to KHz regime with no moving parts. In the second part of the talk, I will describe techniques for insitu synthesis of morphologically diverse nanostructures via geometrical control. By physically coupling growth and transport dynamics of reactants in a continuous flow reactor, we demonstrate programmed synthesis of complex geometrical patterns of Zinc Oxide nanowires in microchannels. Time permitting, I will discuss some of our ongoing work on development of new tools for stretching biomolecules.  
David Quéré (École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI))  Impact figures 
Abstract: Since Worthington, many situations generated by impacts in liquids were documented and explored. In this spirit, we would like to present several recent observations related to the behavior of projectiles after they hit different kinds of liquids. We first discuss the impact on soap films, and naturally extend these observations to foams, focussing on the ability of such complex fluids to absorb the kinetic energy of the projectiles. We also consider impacts in a viscous liquid, and describe the particular kind of cavity generated by the shock. And we conclude by looking at the behaviour of revolving projectiles, discussing the characteristics of the trajectory induced by the rotation. Other contributors to this talk: Anne Le Goff, Guillaume Dupeux and Christophe Clanet.  
Antonio Ramos (University of Sevilla)  Travelingwave electroosmosis and faradaic currents: the diffusion layer 
Abstract: Pumping of electrolytes in microchannels can be achieved with arrays of microelectrodes subjected to AC potentials. Here we show experiments on electrolyte flow induced by microelectrodes subjected to travelingwave potentials. For sufficiently high voltages, Faradaic currents are present, leading to changes in the liquid properties and, in particular, changes in pH. A remarkable feature of the observations is that at voltages above a threshold, the direction of the fluid flow is reversed. These observations motivate the theoretical study of Faradaic currents in electrokinetics for the general case of ionic species with different mobilities. We find, using a linear analysis, that the structure of the electrical double layer (EDL) has to be extended. The EDL consists of the compact and Debye layers, as in previous models, plus a diffusion layer that arises as a consequence of Faradaic currents. For the general case of different mobilities, there is a net electrical charge associated to the diffusion layer. As a particular result of this model, we show that traveling potentials generate flow in the reverse direction for the case of a thick compact layer and facile Faradaic reactions, if the reacting ions are the more mobile. This situation is consistent with the experimental observation of changes in pH due to proton reactions at the electrodes.  
Isaak Rubinstein (Ben Gurion University of the Negev)  Extended space charge effects in concentration polarization 
Abstract: Keywords: Extended Space Charge, Concentration Polarization, Overlimiting Conductance, Nonequilibrium Electroosmotic Instability Abstract: Our talk is about ionic currents from an electrolyte solution into a charge selective solid, such as, an electrode, an ion exchange membrane or an array of nanochannels in a microfluidic system, and the related viscous fluid flows on the length scales varying from nanometers to millimeters. All systems of this kind have characteristic voltagecurrent curves with segments in which current nearly saturates at some plateau values due to concentration polarization – formation of solute concentration gradients under the passage of a DC current. We start by reviewing a few seemingly different phenomena occurring in that range. These are anomalous rectification in cathodic copper deposition from a copper sulfate solution, superfast vortexes near an ionexchange granule, overlimiting conductance in electrodialysis and the recently observed non equilibrium electroosmotic instability. All these phenomena result from formation of an additional extended space charge layer next to that of a classical electric double layer at the solid/liquid interface. We review the peculiar features the extended space charge and their relation to the mechanisms of the above mentioned phenomena.  
Riccardo Sacco (Politecnico di Milano)  Multiphysics computational models for neurochip simulation 
Abstract: Neurochips (NCs) are biohybrid devices in which living brain cells
and silicon circuits are coupled together. NCs are presently being
used as a noninvasive technique to record cellular response to drugs,
and are expected to be used in the cure of neurological disorders
through the creation of sophisticated neural prostheses.
The main technological challenge in the design of NCs is the
efficient transduction of the input biological signal (ion current of
the order of nA) into an output signal (electrical current) which is
modulated by the effective driving voltage of the open Gate of
the silicon device (of the order of mV). In order to devise a
sound simulation tool of the I/O behavior of a NC device, we
propose a multiphysics computational model including:
1) the PoissonNernstPlanck system, to account for intracellular and extracellular electrochemical ion transport; 2) the HodgkinHuxley system, to describe ion transport across membrane channels; 3) a nonlinear MOS capacitor approximation, to account for celltochip coupling. The nonlinear system arising from the coupled solution of 1)3) is successively solved by a functional iteration procedure, and for each time level of the simulation, each obtained subproblem is numerically solved using a stabilized mixedhybridized finite element discretization scheme. In order to provide a successful validation of the computational procedure, we discuss preliminary results on two cases of physiological interest, namely, the HodgkinHuxley axon and the response of a fieldeffect transistor with metalfree gate oxide under an intracellular voltage depolarization stimulating impulse. 

David Saintillan (University of Illinois at UrbanaChampaign)  Electrokinetic phenomena in particulate suspensions: an introduction 
Abstract: No Abstract  
Charles M. Schroeder (University of Illinois at UrbanaChampaign)  Hydrodynamic trap for single cells, particles and molecules 
Abstract: The ability to trap individual particles, cells and macromolecules has revolutionized many fields of science during the last two decades. Several methods of particle trapping and micromanipulation have been developed based on optical, magnetic and electric fields. In this work, we describe an alternative trapping method, the hydrodynamic trap, based on the sole action of hydrodynamic forces in a microfluidic device. A microfluidic cross slot device is fabricated consisting of two perpendicular microchannels where opposing laminar flow streams converge. In this device, a purely extensional flow field is created at the microchannel junction, thereby resulting in a semistable potential well at the stagnation point which enables particle trapping. We implement an automated feedbackcontrol mechanism to adjust the location of the stagnation point which facilitates active particle trapping. Using the hydrodynamic trap, we successfully demonstrate trapping and manipulation of single particles and cells for arbitrarily long observation times. This technique offers a new venue for observation of biological materials without surface immobilization, eliminates potentially perturbative optical, magnetic and electric fields, and provides the capability to change the surrounding medium conditions of the trapped object during observation.  
Eric S. G. Shaqfeh (Stanford University)  The microfluidics of colloidal particlevesiclecapsule mixtures with application to blood additives 
Abstract: Keywords: Brownian rods, surfboards, drug delivery, capsules, vesicles, margination Abstract: Many dispersions of colloidal particles with application in materials processing, biological assays, or medicine, contain elongated particles (e.g. ellipsoidal disks, rods, etc.) Recently these particles have been used in drug delivery applications because of the inability of leukocytes to easily rid them from the circulation. Moreover such particles are useful at the nanoscale for application in cancer therapies, either for detection of tumor vasculature or for the delivery of anticancer agents to tumor endothelial cells. Thus, the study of anisotropic particulate flows with adhesion in microchannels especially in mixtures with vesicle flows (i.e. red blood cells) has taken on a particularly important set of engineering applications. In order to understand the transport in these systems, a numerical simulation must include: a) a high fidelity representation of nonequilibrium dynamics of vesicles and capsules in microflows, b) the dynamic simulation of Brownian colloidal particles of general shape in microflows, and c) the combination of these in mixtures at finite concentration. Each of these transport processes brings in new physics which we will review. In discussing a) we will focus on the transition between tanktreading, tumbling, and trembling dynamics in flow and whether these transitions also happen at finite concentration in microfluidics. In b) we will discuss the particle concentration distribution of Brownian nonspherical particles in microfluidic flows and its relation to the nonequilibrium osmotic pressure. In c) we will examine how particle margination in mixtures occurs and how it is related to the concentration of vesicles/capsules in the microflow. Ultimately, we will look toward the virtual prototyping and engineering of these therapies.  
John D. Sherwood (University of Cambridge)  Electrical streaming potential generated by 2phase flow 
Abstract: Keywords: Streaming potential, multiphase flow, porous media Abstract: Streaming potentials generated by single phase flow are reasonably wellunderstood, but much less is known about the effects of multiphase flow. The introduction of a second fuid phase can either increase the wall shear rate (thereby increasing streaming currents caused by convection of ionic charge clouds), or can decrease it, depending on the ratio of the viscosities of the two phases and on the effect of interfacial tension. If the second phase is nonconducting (e.g. oil droplets in water), the effective conductivity of the mixture is decreased, and streaming potentials tend to increase. I shall review the few experimental results that are available, and describe recent theoretical work aimed at understanding the effect of a single particle or fluid droplet flowing through a capillary. J.D. Sherwood, Streaming potential generated by twophase flow in a capillary. Phys. Fluids, 19 (2007) 053101. J.D. Sherwood, Streaming potential generated by a long viscous drop in a capillary. Langmuir, 24 (2008) 10011. E. Lac & J.D. Sherwood, Streaming potential generated by a drop moving along the centreline of a capillary. J. Fluid Mech. (in the press)  
Zuzanna S. Siwy (University of California, Irvine)  Ion transport through nanopores: From living cells to diodes and transistors 
Abstract: Keywords: nanofluidics, channel, diode, ion current Abstract: Transport through nanopores and ion channels exists in virtually all biological cells and is important in such things as the regulation of heart function, nerve signals, and delivery of nutrients to the cell. Nanopores have also started to play a major role in contemporary biotechnology, because many separation and sensing processes require pores with nanometersized openings. My scientific interests have been focused on fabricating synthetic single nanopores with applications in biophysics and nanotechnology. The nanopores that we fabricate by the tracketching technique have diameters as small as 1 nanometer, they have controlled geometry and surface chemistry. I will show application of these nanopores as devices for controlling the flow of ions and charged molecules in a solution, functioning as ionic bipolar and unipolar diodes as well as ionic transistors. These functions are achieved by patterning the surface charge of the pore walls. Our systems will be applicable in nanofluidic, labonthechip, and biosensing systems. An example for application of ionic diodes in building sensors for anthrax will be discussed. I will also show how to induce ion current oscillations in time with frequencies between tens of Hz and fractions of Hz.  
Todd Squires (University of California, Santa Barbara)  Electrokinetics of highly charged surfaces 
Abstract: No Abstract  
Paul H. Steen (Cornell University)  Countering capillarity with electrokinetics: from micromanipulation to Debyelayer diagnostics 
Abstract: Electroosmosis, originating in the Debyelayer near the solid/liquid boundary within a fullysaturated porous substrate, can pump successfully against the capillary pressure arising from the surface tension of a droplet placed in series with the pump. As droplet size diminishes, the voltage required to pump electroosmotically downscales favorably. The technological implication is that electromechanical transducers made of large arrays of small droplets, socalled 'droplet micromanipulators', and Debyelayer 'diagnostic machines', inferring zetapotential by measuring interface deflection of a dropletpumpdroplet configuration, become feasible. These applications will be illustrated and we will describe the current modeling of such multiscale interfacial systems, highlighting open questions that might benefit from an applied mathematical approach.  
Derek Stein (Brown University)  Free energy landscaping: Nanotopographic control over DNA conformations and transport 
Abstract: Nanofluidic devices with an embedded nanotopography direct the selforganization and transport of long DNA molecules by influencing the free energy landscape. We studied the pressuredriven transport of DNA in slitlike nanochannels containing linear arrays of nanopits. We imaged individual DNA molecules moving singlefile down the nanopit array, undergoing sequential pittopit hops using fluorescence video microscopy. Distinct transport dynamics were observed depending on whether a molecule could occupy a single pit, or was forced to subtend multiple pits. We interpret these results in terms of a scaling theory of the free energy of polymer chains in a linear array of pits. Molecules contained within a single pit are predicted to face an entropic free energy barrier, and to hop between pits stochastically by thermally activated transport. Molecules that subtend multiple pits, on the other hand, can transfer DNA contour from upstream to downstream pits in response to an applied fluid flow, which lowers the energy barrier. When the trailing pit completely empties, or when the leading pit reaches its capacity, the energy barrier is predicted to vanish, and the lowpressure, thermally activated transport regime gives way to a highpressure, deterministic transport regime. These results contribute to our understanding of polymers in nanoconfined environments, and can guide the design of nanoscale labonachip applications for DNA analysis.  
Huan Sun (Pennsylvania State University)  A diffusive interface method of modeling mutliphase flows 
Abstract: We present an diffusive interface approach to modeling multiphase flows. A modified interfacial energy functional is employed to describe diffusive interfaces of (im)miscible phases. A fluid system where the Stokes equations are coupled with convectiondiffusion equations are derived from the energy functional via the Energetic Variational Approaches (EVA). A particular case with slip boundary conditions on the interfaces were studied. In the numerical simulations we applied the Pressure Schur Complement (PSC) method to the hydrodynamical system. A Krylov subspace method with an Algebraic Mutligrid (AMG) preconditioner was used to solve the resulted linear system.  
Vladimir Sverak (University of Minnesota)  Topics in the theory of the NavierStokes equations 
Abstract: The course will cover certain selected topics in the theory of the NavierStokes equations. After a brief overview of the main issues of the general theory we will focus on problems in the theory of the steadystate solutions. There are many open problems concerning the steadystate solutions. These problems are presumably easier than the main open questions about the timedependent equations. Nevertheless, some of them have remained unsolved since their first explicit formulation in the pioneering works of Jean Leray in the 1930s. There is a certain indirect similarity (or "duality") between the mathematical issues raised by these steadystate problems and the issues which come up in connection with the more wellknown open problems about the timedependent equations. In the lectures I hope to cover some of the important results about the steadystate solutions and discuss some of the open problems. The course will be accessible to postdocs and to graduate students with some knowledge of PDEs. For example, an introductory graduate PDE course should be a sufficient prerequisite.  
Ulrich Tallarek (PhilippsUniversität Marburg)  Electric field gradient focusing in microchannels with embedded bipolar electrode 
Abstract: The complex interplay of electrophoretic, electroosmotic, bulk convective, and diffusive mass/charge transport in a hybrid poly(dimethylsiloxane) (PDMS)/glass microchannel with embedded floating electrode is analyzed. The thin floating electrode attached locally to the wall of the straight microchannel results in a redistribution of local field strength after the application of an external electric field. Together with faradaic reactions taking place at the bipolar electrode and buffer reactions, as well as bulk convection based on cathodic electroosmotic flow, an extended field gradient is formed in the anodic microchannel segment. It imparts a spatially dependent electrophoretic force on charged analytes and, in combination with the bulk convection, results in an electric field gradient focusing at analytespecific positions. Analyte concentration in the enriched zone approaches a maximum value which is independent of its concentration in the supplying reservoirs. A simple approach is shown to unify the temporal behavior of the concentration factors under general conditions.  
Lalitha Venkataramanan (SchlumbergerDoll)  Research in applied mathematics at Schlumberger 
Abstract: The search for oil and gas has three objectives: to identify and evaluate hydrocarbonbearing reservoirs; to bring hydrocarbons to the surface safely and costeffectively, without harming the environment; and to maximize the yield from each discovery. This talk will focus on some aspects of research in applied mathematics in the area of nuclear magnetic resonance and its application to the oilfield at Schlumberger.  
Petia M. Vlahovska (Dartmouth College)  Dynamics of drops and vesicles in electric fields 
Abstract: Drop deformation in uniform electric fields is a classic problem. The pioneering work of G.I.Taylor demonstrated that for weakly conducting media, the drop fluid undergoes a toroidal flow and the drop adopts a prolate or oblate spheroidal shape, the flow and shape being axisymmetrically aligned with the applied field. However, recent studies have revealed a nonaxisymmetric rotational mode for drops of lower conductivity than the surrounding medium, similar to the rotation of solid dielectric spheres observed by Quincke in the 19th century. I will present an experimental and theoretical study of this phenomenon in DC fields. The critical electric field, drop inclination angle, and rate of rotation are measured. For small, high viscosity drops, the threshold field strength is well approximated by the Quincke rotation criterion. Reducing the viscosity ratio shifts the onset for rotation to stronger fields. The drop inclination angle increases with field strength. The rotation rate is approximately given by the inverse MaxwellWagner polarization time. We also observe a hysteresis in the tilt angle for lowviscosity drops. I will also discuss our work on drops encapsulated by complex interfaces such as lipid bilayer membranes. A comparison between the behavior of drops and giant vesicles (cellsize lipid membrane sacs) highlights new features due to the membrane electromechanics. This work is in collaboration with Paul Salipante (Dartmouth) and Dr. Rumiana Dimova’s group (Max Planck Institute of Colloids and Interfaces).  
Ehud Yariv (TechnionIsrael Institute of Technology)  Migration of ionexchange particles under the action of a uniformly applied electric field 
Abstract: An ideally polarizable cationselective solid particle is suspended in an electrolyte solution and is exposed to a uniformly applied ambient electric field. The electrokinetic transport processes are described in a closed mathematical model, consisting of differential equations, representing the physical balance laws, as well as boundary conditions and integral constraints, representing the physicochemical condition on the particle boundary and at large distances away from it. Solving this model would in principle provide the electrokinetic flow about the particle and the concomitant particle drift relative to the otherwise quiescent fluid. Using matched asymptotic expansions, the model is analyzed in the thinDebyelayer limit. An effective `macroscale' description is extracted, whereby effective boundary conditions represent appropriate asymptotic matching with the Debyescale fields. The macroscale description significantly differs from that corresponding to a chemically inert ideally polarizable particle. Thus, ion selectivity on the particle surface results in a macroscale salt concentration polarization, whereby the electric potential is rendered nonharmonic. Moreover, the uniform Dirichlet condition governing this potential on the particle surface is transformed into a nonuniform Dirichlet condition on the macroscale particle boundary. The DukhinDerjaguin slip formula still holds, but with a nonuniform zeta potential that depends upon the salt concentration distribution. For weakly applied fields, an approximate solution is obtained as a perturbation to an equilibrium state. The linearized solution corresponds to a uniform zeta potential; it predicts a particle velocity which is proportional to the applied field. The associated electrokinetic flow differs however from that in the comparable electrophoresis of an inert particle surface, since it is driven by two different agents, electric field and salinity gradients, which are of comparable magnitude. The velocity field, specifically, is rotational.  
Minami Yoda (Georgia Institute of Technology)  Nonuniform interfacial colloidal tracer distributions and implications for microscale PIV 
Abstract: Keywords: Interfacial particleimage velocimetry, colloidal particles, microfluidics, electrokinetically driven flows Abstract: Interfacial effects are important in many cases for microscale transport. One of the few experimental techniques that can resolve interfacial transport with submicron spatial resolution is evanescent wavebased, or nano, particleimage velocimetry (PIV), which determines fluid velocities over the first 500 nm next to the wall from the displacements of 100500 nm neutrally buoyant tracers. The wallnormal spatial resolution of nanoPIV is further improved by multilayer nanoPIV (MnPIV), which exploits the exponentially decaying intensity of evanescentwave illumination to obtain velocities at different distances from the fluidsolid interface within about 500 nm of the wall. In agreement with DLVO theory, the distribution of the colloidal tracers within a particle diameter of the wall measured by MnPIV is highly nonnuniform due to repulsive electric double layer interactions and van der Waals effects. Nevertheless, the MnPIV results for steady creeping Poiseuille flow are in good agreement with analytical predictions once the velocities have been corrected for this nonuniform distribution. This talk describes velocity and Brownian diffusion coefficient measurements obtained from tracers with diameters ranging from 100 nm to 500 nm for Poiseuille flow through hydrophilic and hydrophobically coated fusedsilica microchannels and for electrokinetically driven flows through fusedsilica microchannels with a minimum crosssectional dimension of about 40 microns. The nearwall particle distributions for 500 nm tracers are shown to vary with electric field for the electrokinetically driven flows, due presumably to electrophoresis and induced charge electroosmosis.  
Gilad Yossifon (TechnionIsrael Institute of Technology)  Understanding electrokinetics at the nanoscale: Beyond the limiting current 
Abstract: We examined the important overlimiting ionic current phenomenon, occurring at ionpermselective nanoporous membrane or nanochannel, and suggested a modified theoretical description of the entire nonlinear currentvoltage curve based on the instability selected concentrationpolarization layer thickness. In the process we discovered several curious and nonintuitive behaviors: 1) a nanoslot array with a uniform surface charge and height but with asymmetric slot entrances is shown to exhibit strong rectification, gating type currentvoltage characteristics and a total current higher than the sum of isolated slots at a large voltage; 2) the vanishing of the limiting resistance voltage window with increased geometrical field focusing effect obtained by varying the nanoslot width. Hence, suggesting that an optimal pore radius/separation ratio exists for maximum current density across a membrane; 3) strong nanocolloidnanoslot interaction that leads to an additional transition region (or critical voltage) prior to the overlimiting region.  
Boris Zaltzman (Jacob Blaustein Institute for Desert Research)  Electric double layer and concentration polarization 
Abstract: No Abstract 
Shahriar Afkhami  New Jersey Institute of Technology  12/7/2009  12/11/2009 
Shelley L. Anna  Carnegie Mellon University  12/5/2009  12/11/2009 
Noritoshi Araki  University of Minnesota  12/7/2009  12/11/2009 
Noritoshi Araki  University of Minnesota  12/5/2009  12/6/2009 
Paul J. Atzberger  University of California, Santa Barbara  12/8/2009  12/11/2009 
Nusret Balci  University of Minnesota  9/1/2009  8/31/2010 
Jaydeep P. Bardhan  Argonne National Laboratory  12/5/2009  12/11/2009 
Jaydeep P. Bardhan  Argonne National Laboratory  12/1/2009  12/4/2009 
Martin Z. Bazant  Massachusetts Institute of Technology  12/6/2009  12/8/2009 
Jennifer Beichman  University of Michigan  9/1/2009  5/31/2010 
Olus N. Boratav  Corning Incorporated  12/5/2009  12/11/2009 
John F. Brady  California Institute of Technology  12/4/2009  12/11/2009 
Richard J. Braun  University of Delaware  9/1/2009  12/15/2009 
Michael P. Brenner  Harvard University  12/9/2009  12/10/2009 
Henrik Bruus  Technical University of Denmark  12/5/2009  12/11/2009 
Thomas P. Burg  MaxPlanckInstitut für Biophysikalische Chemie  12/6/2009  12/11/2009 
Wei Cai  University of North Carolina  Charlotte  12/7/2009  12/10/2009 
MariaCarme T. Calderer  University of Minnesota  9/1/2009  6/30/2010 
Chi Hin Chan  University of Minnesota  9/1/2009  8/31/2010 
HsuehChia Chang  University of Notre Dame  12/6/2009  12/11/2009 
Xianjin Chen  University of Minnesota  9/1/2008  8/31/2010 
Zhen Chen  Northwestern University  12/4/2009  12/12/2009 
Greg P. Chini  University of New Hampshire  12/4/2009  12/11/2009 
Tom Chou  University of California, Los Angeles  12/6/2009  12/11/2009 
A. Terrence Conlisk  Ohio State University  12/6/2009  12/11/2009 
L. Pamela Cook  University of Delaware  9/6/2009  12/12/2009 
Michael Earl Cromer Jr  University of Delaware  9/1/2009  12/20/2009 
Darren G. Crowdy  Imperial College London  12/4/2009  12/9/2009 
Linda J. Cummings  New Jersey Institute of Technology  12/8/2009  12/11/2009 
M. Cristina Depassier  Pontificia Universidad Catolica de Chile  12/4/2009  12/13/2009 
Shu Ding  University of Minnesota  12/7/2009  12/11/2009 
Charles Doering  University of Michigan  8/15/2009  6/15/2010 
Kevin D. Dorfman  University of Minnesota  12/6/2009  12/11/2009 
Patrick S. Doyle  Massachusetts Institute of Technology  12/6/2009  12/9/2009 
Jens Eggers  University of Bristol  12/5/2009  12/12/2009 
Robert S. Eisenberg  Rush University Medical Center  12/4/2009  12/10/2009 
Randy H. Ewoldt  University of Minnesota  9/1/2009  8/31/2010 
Marco Antonio Fontelos  Consejo Superior de Investigaciones Científicas (CSIC)  12/2/2009  12/12/2009 
Sandip Ghosal  Northwestern University  9/21/2009  12/12/2009 
Michael D. Graham  University of Wisconsin  9/1/2009  12/17/2009 
J. Michael Gray  Medtronic  12/4/2009  12/4/2009 
Günther Grün  FriedrichAlexanderUniversität ErlangenNürnberg  12/5/2009  12/12/2009 
Thomas C. Hagen  University of Memphis  9/1/2009  12/23/2009 
Yunkyong Hyon  University of Minnesota  9/1/2008  8/31/2010 
Mark Iwen  University of Minnesota  9/1/2008  8/31/2010 
Srividhya Jeyaraman  University of Minnesota  9/1/2008  8/31/2010 
Lijian Jiang  University of Minnesota  9/10/2008  8/31/2010 
Thomas B. Jones  University of Rochester  12/6/2009  12/11/2009 
Mihailo Jovanovic  University of Minnesota  9/11/2009  6/10/2010 
HyeWon Kang  University of Minnesota  12/15/2009  12/15/2009 
Dmitry Karpeev  Argonne National Laboratory  12/1/2009  12/4/2009 
Yutaka Kazoe  Georgia Institute of Technology  12/6/2009  12/11/2009 
Markus Keel  University of Minnesota  7/21/2008  6/30/2010 
Aditya Satish Khair  University of California, Santa Barbara  12/6/2009  12/11/2009 
Hyejin Kim  University of Minnesota  9/1/2009  8/31/2010 
Scott King  University of Minnesota  12/7/2009  12/11/2009 
Matthew Gregg Knepley  Argonne National Laboratory  12/1/2009  12/4/2009 
Pawel Konieczny  University of Minnesota  9/1/2009  8/31/2010 
Satish Kumar  University of Minnesota  12/6/2009  12/11/2009 
Nabil Laachi  University of Minnesota  12/7/2009  12/11/2009 
Nabil Laachi  University of Minnesota  12/5/2009  12/6/2009 
Ronald G. Larson  University of Michigan  9/12/2009  12/18/2009 
Eric Lauga  University of California, San Diego  12/6/2009  12/10/2009 
ChiunChang Lee  National Taiwan University  10/22/2009  6/30/2010 
YoungJu Lee  Rutgers University  9/11/2009  12/14/2009 
Marta Lewicka  University of Minnesota  9/1/2009  6/30/2010 
Yi Li  Stevens Institute of Technology  9/16/2009  12/17/2009 
Yongfeng Li  University of Minnesota  9/1/2008  8/31/2010 
TaiChia Lin  National Taiwan University  11/29/2009  12/10/2009 
Zhi (George) Lin  University of Minnesota  9/1/2009  8/31/2010 
Maggie Linak  University of Minnesota  12/7/2009  12/11/2009 
Reinhard Lipowsky  Max Planck Institute for Colloids and Interfaces  12/5/2009  12/10/2009 
Chun Liu  University of Minnesota  9/1/2008  8/31/2010 
Detlef Lohse  Universiteit Twente  12/6/2009  12/10/2009 
Ellen K. Longmire  University of Minnesota  9/1/2009  6/30/2010 
Yasunori Maekawa  Kobe University  9/7/2009  3/1/2010 
Krishnan Mahesh  University of Minnesota  9/1/2009  6/30/2010 
Kara Lee Maki  University of Minnesota  9/1/2009  8/31/2010 
Shreyas Mandre  Harvard University  12/4/2009  12/12/2009 
Vasileios Maroulas  University of Minnesota  9/1/2008  8/31/2010 
Michael J. Miksis  Northwestern University  12/6/2009  12/11/2009 
Chaouqi Misbah  Université de Grenoble I (Joseph Fourier)  12/8/2009  12/11/2009 
Yoichiro Mori  University of Minnesota  9/1/2009  6/30/2010 
Frieder Mugele  Universiteit Twente  12/6/2009  12/11/2009 
Susan J. Muller  University of California, Berkeley  12/5/2009  12/11/2009 
Ali Nadim  Claremont Graduate University  12/4/2009  12/11/2009 
Monika Nitsche  University of New Mexico  9/1/2009  12/18/2009 
Peter D. Olmsted  University of Leeds  12/6/2009  12/11/2009 
Daniel W Olson  University of Minnesota  12/7/2009  12/11/2009 
Cecilia OrtizDuenas  University of Minnesota  9/1/2009  8/31/2010 
Hans G. Othmer  University of Minnesota  9/1/2009  6/30/2010 
Jia Ou  University of Minnesota  12/7/2009  12/11/2009 
Sumita Pennathur  University of California, Santa Barbara  12/6/2009  12/11/2009 
Jonathan D. Posner  Arizona State University  12/6/2009  12/11/2009 
Manu Prakash  Harvard University  12/6/2009  12/11/2009 
David Quéré  École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI)  12/5/2009  12/11/2009 
Antonio Ramos  University of Sevilla  12/6/2009  12/11/2009 
Michael Renardy  Virginia Polytechnic Institute and State University  9/1/2009  12/12/2009 
Yuriko Renardy  Virginia Polytechnic Institute and State University  9/1/2009  12/12/2009 
Juan Mario Restrepo  University of Arizona  8/11/2009  6/15/2010 
Scott Alan Roberts  University of Minnesota  12/7/2009  12/11/2009 
Isaak Rubinstein  Ben Gurion University of the Negev  12/6/2009  12/11/2009 
Rolf Ryham  Rice University  12/4/2009  12/11/2009 
Riccardo Sacco  Politecnico di Milano  12/4/2009  12/11/2009 
David Saintillan  University of Illinois at UrbanaChampaign  12/4/2009  12/11/2009 
Fadil Santosa  University of Minnesota  7/1/2008  6/30/2010 
Arnd Scheel  University of Minnesota  9/1/2009  6/30/2010 
Charles M. Schroeder  University of Illinois at UrbanaChampaign  12/6/2009  12/11/2009 
George R Sell  University of Minnesota  9/1/2009  6/30/2010 
Tsvetanka Sendova  University of Minnesota  9/1/2008  8/31/2010 
Shuanglin Shao  University of Minnesota  9/1/2009  8/31/2010 
Eric S. G. Shaqfeh  Stanford University  12/6/2009  12/11/2009 
Amy Shen  University of Washington  12/6/2009  12/11/2009 
John D. Sherwood  University of Cambridge  12/5/2009  12/11/2009 
Zuzanna S. Siwy  University of California, Irvine  12/8/2009  12/11/2009 
Daniel Spirn  University of Minnesota  9/8/2009  6/1/2010 
Todd Squires  University of California, Santa Barbara  12/4/2009  12/10/2009 
Paul H. Steen  Cornell University  10/15/2009  12/15/2009 
Derek Stein  Brown University  12/6/2009  12/11/2009 
Panagiotis Stinis  University of Minnesota  9/1/2009  6/30/2010 
Brian D. Storey  Franklin W. Olin College of Engineering  12/6/2009  12/11/2009 
Huan Sun  Pennsylvania State University  8/16/2009  12/15/2009 
Vladimir Sverak  University of Minnesota  9/1/2009  6/30/2010 
Ulrich Tallarek  PhilippsUniversität Marburg  12/5/2009  12/11/2009 
Mark Taylor  Sandia National Laboratories  9/1/2009  12/18/2009 
JeanLuc Thiffeault  University of Wisconsin  9/1/2009  6/30/2010 
Joel Thomas  University of Minnesota  12/7/2009  12/11/2009 
Burt S. Tilley  Worcester Polytechnic Institute  12/6/2009  12/9/2009 
Chad Michael Topaz  Macalester College  9/1/2009  6/30/2010 
Nathan Totz  University of Michigan  12/8/2009  12/12/2009 
Lalitha Venkataramanan  SchlumbergerDoll  12/17/2009  12/18/2009 
Petia M. Vlahovska  Dartmouth College  12/4/2009  12/11/2009 
Changyou Wang  University of Kentucky  9/1/2009  6/15/2010 
Sijue Wu  University of Michigan  9/1/2009  6/5/2010 
Wei Xiong  University of Minnesota  9/1/2008  8/31/2010 
Jin Xu  Shanghai University of Traditional Chinese Medicine  12/9/2009  6/9/2010 
Xiaochuan Yang  Massachusetts Institute of Technology  12/5/2009  12/11/2009 
Ehud Yariv  TechnionIsrael Institute of Technology  12/6/2009  12/12/2009 
Minami Yoda  Georgia Institute of Technology  12/7/2009  12/11/2009 
Tsuyoshi Yoneda  University of Minnesota  9/4/2009  8/31/2010 
Gilad Yossifon  TechnionIsrael Institute of Technology  12/6/2009  12/10/2009 
Boris Zaltzman  Jacob Blaustein Institute for Desert Research  12/4/2009  12/11/2009 
Weigang Zhong  University of Minnesota  9/8/2008  8/31/2010 
Yongcheng Zhou  Colorado State University  12/6/2009  12/11/2009 