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Issue 25, 2016
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Dynamics of inert spheres in active suspensions of micro-rotors

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Inert particles suspended in active fluids of self-propelled particles are known to often exhibit enhanced diffusion and novel coherent structures. Here we numerically investigate the dynamical behavior and self-organization in a system consisting of passive and actively rotating spheres of the same size. The particles interact through direct collisions and the fluid flows generated as they move. In the absence of passive particles, three states emerge in a binary mixture of spinning spheres depending on particle fraction: a dilute gas-like state where the rotors move chaotically, a phase-separated state where like-rotors move in lanes or vortices, and a jammed state where crystals continuously assemble, melt and move (K. Yeo, E. Lushi, and P. M. Vlahovska, Phys. Rev. Lett., 2015, 114, 188301). Passive particles added to the rotor suspension modify the system dynamics and pattern formation: while states identified in the pure active suspension still emerge, they occur at different densities and mixture proportions. The dynamical behavior of the inert particles is also non-trivially dependent on the system composition.

Graphical abstract: Dynamics of inert spheres in active suspensions of micro-rotors

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Article information

12 Feb 2016
28 May 2016
First published
31 May 2016

Soft Matter, 2016,12, 5645-5652
Article type

Dynamics of inert spheres in active suspensions of micro-rotors

K. Yeo, E. Lushi and P. M. Vlahovska, Soft Matter, 2016, 12, 5645
DOI: 10.1039/C6SM00360E

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