Active matter

Friday, January 19, 2018 - 2:00pm - 2:50pm
Qi Wang (University of South Carolina)
*Also affiliated with Beijing Computational Science Research Center
Thursday, January 18, 2018 - 10:00am - 10:50am
Igor Aronson (The Pennsylvania State University)
Living nematic is a realization of an active matter combining a nematic liquid crystal with swimming bacteria. The material exhibits a remarkable tendency towards spatio-temporal self-organization manifested in the creation of dynamic textures of self-propelled half-integer topological defects (disclinations or vortices). The well-established and validated model of nematic liquid crystals coupled to the bacterial dynamics is used to describe intricate properties of such a living nematic.
Tuesday, January 16, 2018 - 10:00am - 10:50am
Jordi Ignés (University of Barcelona)
When dispersed in a nematic liquid crystal, colloidal particles can be driven along the local director by the action of an oscillating electric field. This phenomenon, called liquid-crystal-enabled electro-osmosis results mainly from the unbalanced ionic flows coupled to the distortions of the elastic matrix. Individual particles move ballistically along the local director but feature an anomalous diffusive behavior in the perpendicular direction that we tune by changing the temperature-dependent material properties or the nature of the inclusion.
Tuesday, January 16, 2018 - 9:00am - 9:50am
Oleg Lavrentovich (Kent State University)
Self-propelled bacteria are marvels of nature. If we can control their dynamics, we could use it to power microsystems of the future. Unfortunately, bacteria swim mostly randomly in isotropic liquids such as water. It is difficult to control their dynamics by factors other than transient gradients of nutrients; visual, acoustic and tactile communication channels that humans use to control large animals are not effective.
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