Campuses:

Liquids

Friday, June 29, 2012 - 1:30pm - 2:20pm
Christian Seis (University of Toronto)
Coarsening dynamics are gradient flow dynamics. This means, the evolution of an out-of-equilibrium system towards relaxation follows the steepest descent in an energy landscape. In many two-phase systems, the energy is proportional to the area of the interfacial layer between these phases. Therefore, descent in an energy landscape corresponds to reduction of the interface --- the pattern formed by the two phases coarsens.
Wednesday, December 9, 2009 - 10:50am - 11:30am
Thomas Jones (University of Rochester)
Keywords: dielectrophoresis, electrowetting, electromechanics, microfluidics
Wednesday, December 9, 2009 - 3:20pm - 4:00pm
Hsueh-Chia Chang (University of Notre Dame)
Keywords: electrokinetics, nanoscience, limiting current, Donnan potential, ion selectivity, Warburg Impedance

Abstract: With the advent of nanofabrication technologies,
nano-channels with dimensions smaller than the Debye screening
layer can now be fabricated to allow scrutiny of the various
anomalous DC and AC I-V characteristics of ion-selective
membranes at the single-pore level — such knowledge is
essential for rapid DNA sequencing, single-molecule
Wednesday, December 9, 2009 - 1:30pm - 2:10pm
Michael Miksis (Northwestern University)
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 nearly-spherical vesicle in a shear flow. In this near-spherical 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.
Wednesday, December 9, 2009 - 9:00am - 9:40am
David Quéré (École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI))
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
Thursday, September 17, 2009 - 9:00am - 9:45am
Kathleen Stebe (University of Pennsylvania)
We study experimentally complex shaped partially wet particles on liquid-air interfaces. The interface deforms to satisfy the contact angle boundary conditions at the particle-liquid-air contact line. The deformations create excess liquid-air interface. When deformation fields between neighboring particles overlap, the excess area decreases as the particles approach each other. This creates a capillary attraction between the particles. Particle geometry influences the deformation field, creating preferred modes for particle assembly.
Tuesday, March 24, 2009 - 12:00pm - 12:45pm
Robin Garrell (University of California, Los Angeles)
Microfluidic devices without walls have many advantages over channel-based devices. In droplet-based (“digital”) microfluidics, liquids are transported as droplets between parallel plates, rather than as streams. The droplets are created, moved, joined and divided by applying electrical potentials sequentially between electrodes buried beneath a hydrophobic dielectric layer. The resulting device is completely reconfigurable. Samples can be processed in series or simultaneously, each in the same way or through a unique sequence of steps.
Monday, January 12, 2009 - 5:00pm - 5:30pm
David Manolopoulos (University of Oxford)
We have recently shown how path integral simulations can be
streamlined by decomposing the potential into a sum of rapidly
varying short-range and slowly varying long-range contributions.
In this talk, I will describe an efficient way to perform this
decomposition for systems with electrostatic interactions, and
illustrate the method with an application to a flexible water
model. In the limit of large system size, where the calculation
of long-range forces dominates, the present method enables path
Thursday, September 27, 2012 - 3:15pm - 4:05pm
Inwon Christina Kim (University of California, Los Angeles)
We investigate the properties of a model describing the motion of liquid drops sitting on a flat surface. Here we consider the so-called quasi-static approximation model, where the speed of the contact line between the fluid and the surface is much slower than the capillary relaxation time.
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