Obstruction enhances the diffusivity of self-propelled rod-like particles.

Diffusion of self-propelled particles in the presence of randomly distributed obstacles is studied in three dimensions (3D) using Langevin dynamics simulations. It is found that depending on the magnitude of the propelling force and the particle aspect ratio, the diffusion coefficient can be a monotonically decreasing or a non-monotonic concave function of the obstructed volume fraction. Counterintuitive enhancement of the particle diffusivity with increasing the obstacle crowd is shown to be resulted from interplay of self-propulsion and anisotropy in the particle shape. On the propelling force-aspect ratio plane, regions that correspond to monotonic and non-monotonic dependence of the diffusivity on obstacle density are specified using the simulation results and the boundary between the two regions is described.

• Publication year

  2015

• Venue

  Journal of Chemical Physics

• Publication date

  2015-08-09

• Fields of study

  Materials Science, Physics, Chemistry, Medicine

• Identifiers
  DOI 10.1063/1.4966188arXiv 1508.02077PMID 27802645
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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