Aggregation and segregation of confined active particles

Xingbo Yang, Mary Elizabeth Manning, M Cristina Marchetti

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

We simulate a model of self-propelled disks with soft repulsive interactions confined to a box in two dimensions. For small rotational diffusion rates, monodisperse disks spontaneously accumulate at the walls. At low densities, interaction forces between particles are strongly inhomogeneous, and a simple model predicts how these inhomogeneities alter the equation of state. At higher densities, collective effects become important. We observe signatures of a jamming transition at a packing fraction ∼ 0.88, which is also the jamming point for non-active athermal monodisperse disks. At this , the system develops a critical finite active speed necessary for wall aggregation. At packing fractions above ∼ 0.6, the pressure decreases with increasing density, suggesting that strong interactions between particles are affecting the equation of state well below the jamming transition. A mixture of bidisperse disks segregates in the absence of any adhesion, identifying a new mechanism that could contribute to cell sorting in embryonic development. This journal is

Original languageEnglish (US)
Pages (from-to)6477-6484
Number of pages8
JournalSoft Matter
Volume10
Issue number34
DOIs
StatePublished - Sep 14 2014

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Jamming
jamming
Agglomeration
Equations of state
equations of state
Particle interactions
Sorting
Adhesion
classifying
Cells
boxes
inhomogeneity
adhesion
signatures
interactions

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Aggregation and segregation of confined active particles. / Yang, Xingbo; Manning, Mary Elizabeth; Marchetti, M Cristina.

In: Soft Matter, Vol. 10, No. 34, 14.09.2014, p. 6477-6484.

Research output: Contribution to journalArticle

Yang, Xingbo ; Manning, Mary Elizabeth ; Marchetti, M Cristina. / Aggregation and segregation of confined active particles. In: Soft Matter. 2014 ; Vol. 10, No. 34. pp. 6477-6484.
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