Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K31: Active Self-Assembly: Models and Model Systems
3:00 PM–6:00 PM,
Tuesday, March 5, 2024
Room: 102C
Sponsoring
Unit:
GSNP
Chair: Layne Frechette, Brandeis University; Chris Amey, Brandeis University
Abstract: K31.00011 : Active Rods in "Soft" Confinement: Increasing Dispersion via Nematic Alignment*
5:48 PM–6:00 PM
Presenter:
Kevin J Modica
(University of California, Santa Barbara)
Authors:
Kevin J Modica
(University of California, Santa Barbara)
Sho C Takatori
(University of California, Santa Barbara)
We use theory and simulation to determine how topography influences the behavior and transport swarms by as modeling the topography with a "soft" confining potential field. Using both a Langevin-based particle description and a Smoluchowski-based field description, we demonstrate that self-propelled rods align nematically along the channels and demonstrate an exponential increase in axial dispersion. We show that this increase occurs due to the reduction of rotational diffusivity of the rods in the channels. Â Additionally, our work provides a framework for studying rods in any periodic potential field, overcoming the high frequency divergence limitation of traditional multipole expansions.
*This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-21-1-0287. K.J.M. is supported by the National Science Foundation Graduate Research Fellowship under Grant No. 1650114. S.C.T. is supported by the Packard Fellowship in Science and Engineering. Use was made of computational facilities purchased with funds from the National Science Foundation (CNS-1725797) and administered by the Center for Scientific Computing (CSC). The CSC is supported by the California NanoSystems Institute and the Materials Research Science and Engineering Center (MRSEC; NSF DMR 2308708) at UC Santa Barbara.
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