Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S53: Nonequilibrium Statistical Mechanics and Hydrodynamics of Active Matter III
11:15 AM–2:15 PM,
Thursday, March 8, 2018
LACC Room: 513
Sponsoring Units: GSOFT GSNP DFD
Chair: Michael Hagan, Brandeis Univ
Abstract: S53.00009 : Vesicle Transformations under Swim Pressure*
12:51 PM–1:03 PM
Pieter Rein ten Wolde
All types of living cells and their organells are bound by membranes, which are mostly immersed in active environments. In active matters, an important quantity swim pressure was recently shown to depend on boundary shapes. Consequently, understanding how swin pressure interplays with fluidic membranes is highly desired. For the first time, we study vesicle transformations under swim pressure exerted by filled self-propelled particles. Our simplest model gives a novel phase diagram for vesicle shapes with a variation of vesicle volumes and particle driving speeds. Moreover, we surprisingly find a first order phase transition between spherical and prolate shapes without volume constraint. The origin of this phase transition is then well revealed by a theoretical calculation for single particle. Our predictions are directly verifiable in experiments on vesicles filled with Pt-coated Janus particles. Furthermore, they can help to understand and exploit various active behaviors of membranes in both living and designed matters.
*Supported by Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research (NWO).
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