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Rapid-prototyping a Brownian particle in an active bath

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Title
Rapid-prototyping a Brownian particle in an active bath
Author(s)
Jin Tae Park; Govind Paneru; Chulan Kwon; Steve Granick; Hyuk Kyu Pak
Subject
DIFFUSION
Publication Date
2020-09
Journal
SOFT MATTER, v.16, no.35, pp.8122 - 8127
Publisher
ROYAL SOC CHEMISTRY
Abstract
© The Royal Society of Chemistry 2020. Particles kicked by external forces to produce mobility distinct from thermal diffusion are an iconic feature of the active matter problem. Here, we map this onto a minimal model for experiment and theory covering the wide time and length scales of usual active matter systems. A particle diffusing in a harmonic potential generated by an optical trap is kicked by programmed forces with time correlation at random intervals following the Poisson process. The model's generic simplicity allows us to find conditions for which displacements are Gaussian (or not), how diffusion is perturbed (or not) by kicks, and quantifying heat dissipation to maintain the non-equilibrium steady state in an active bath. The model reproduces experimental results of tracer mobility in an active bath of swimming algal cells. It can be used as a stochastic dynamic simulator for Brownian objects in various active baths without mechanistic understanding, owing to the generic framework of the protocol
URI
https://pr.ibs.re.kr/handle/8788114/7651
DOI
10.1039/d0sm00828a
ISSN
1744-683X
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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