Bias- and bath-mediated pairing of particles driven through a quiescent medium

Mejia-Monasterio, Carlos and Oshanin, Gleb (2011). Bias- and bath-mediated pairing of particles driven through a quiescent medium. "Soft Matter", v. 7 ; pp. 993-1000. https://doi.org/10.1039/c0sm00465k.

Description

Title: Bias- and bath-mediated pairing of particles driven through a quiescent medium
Author/s:
  • Mejia-Monasterio, Carlos
  • Oshanin, Gleb
Item Type: Article
Título de Revista/Publicación: Soft Matter
Date: 2011
Volume: 7
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
Creative Commons Licenses: Recognition - Non commercial

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Abstract

A particle driven by an external force in a molecular crowding environment—a quiescent bath of other particles, makes their spatial distribution inhomogeneous: the bath particles accumulate in front of the biased particle (BP) and are depleted behind. In fact, a BP travels together with the inhomogeneity it creates. A natural question is what will happen with two BPs when they appear sufficiently close to each other such that the inhomogeneities around each of them start to interfere? In quest for the answer we examine here, via Monte Carlo simulations, the dynamics of two BPs in a lattice gas of bath particles. We observe that for a sufficiently dense medium, surprisingly, both BPs spend most of the time together which signifies that the interference of the microstructural inhomogeneities results in effectively attractive interactions between them. Such statistical pairing of BPs minimizes the size of the inhomogeneity and hence reduces the frictional drag force exerted on the BPs by the medium. As a result, in some configurations the center-of-mass of a pair of BPs propagates faster than a single isolated BP. These jamming-induced forces are very different from fundamental physical interactions, exist only in presence of an external force, and require the presence of a quiescent bath to mediate the interactions between the driven particles.

More information

Item ID: 9829
DC Identifier: http://oa.upm.es/9829/
OAI Identifier: oai:oa.upm.es:9829
DOI: 10.1039/c0sm00465k
Official URL: http://pubs.rsc.org/en/content/articlelanding/2011/sm/c0sm00465k
Deposited by: Dr. Carlos Mejia-Monasterio
Deposited on: 13 Dec 2011 12:45
Last Modified: 17 Dec 2018 06:55
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