Jump to main content
Jump to site search

Issue 34, 2014
Previous Article Next Article

Aggregation and segregation of confined active particles

Author affiliations

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 ϕ ∼ 0.88, which is also the jamming point for non-active athermal monodisperse disks. At this ϕ, the system develops a critical finite active speed necessary for wall aggregation. At packing fractions above ϕ ∼ 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.

Graphical abstract: Aggregation and segregation of confined active particles

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Apr 2014, accepted on 23 Jun 2014 and first published on 24 Jun 2014


Article type: Paper
DOI: 10.1039/C4SM00927D
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2014,10, 6477-6484
  •   Request permissions

    Aggregation and segregation of confined active particles

    X. Yang, M. L. Manning and M. C. Marchetti, Soft Matter, 2014, 10, 6477
    DOI: 10.1039/C4SM00927D

Search articles by author

Spotlight

Advertisements