Particle anisotropy tunes emergent behavior in active colloidal systems

Moran, Shannon E.; Bruss, Isaac R.; Schönhöfer, Philipp A.; Glotzer, Sharon C.

doi:10.1039/d0sm00913j

Particle anisotropy tunes emergent behavior in active colloidal systems

Journal Article · Tue Jan 04 00:00:00 EST 2022 · Soft Matter

DOI:https://doi.org/10.1039/d0sm00913j· OSTI ID:1978748

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Univ. of Michigan, Ann Arbor, MI (United States); OSTI
Univ. of Michigan, Ann Arbor, MI (United States)

Studies of active particle systems have demonstrated that particle anisotropy can impact the collective behavior of a system, motivating a systematic study. Here, we report a systematic computational investigation of the role of anisotropy in shape and active force director on the collective behavior of a two-dimensional active colloidal system. We find that shape and force anisotropy can combine to produce critical densities both lower and higher than those of disks. Furthermore, we demonstrate that changing particle anisotropy tunes what we define as a “collision efficiency” of inter-particle collisions in leading to motility-induced phase separation (MIPS) of the system. We use this efficiency to determine the relative critical density across systems. Additionally, we observe that local structure in phase-separated clusters is the same as the particle's equilibrium densest packing, suggesting a general connection between equilibrium behavior and non-equilibrium cluster structure of self-propelled anisotropic particles. In engineering applications for active colloidal systems, shape-controlled steric interactions such as those described here may offer a simple route for tailoring emergent behaviors.

View Accepted Manuscript (DOE)

Research Organization:: Northwestern University, Evanston, IL (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; SC0000989

OSTI ID:: 1978748

Alternate ID(s):: OSTI ID: 1839479

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 5 Vol. 18; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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