To study the role of torque in motility-induced phase separation (MIPS), we simulate a system of self-propelled particles whose shape varies smoothly from isotropic (disks/spheres) to weakly elongated (rods). We construct the phase diagrams of 2D active disks, 3D active spheres, and 2D/3D active rods of aspect ratio l/σ = 2. A stability analysis of the homogeneous isotropic phase allows us to predict the onset of MIPS based on the effective swimming speed and rotational diffusion of the particles. Both methods find suppression of MIPS as the particle shape is elongated. We propose a suppression mechanism based on the duration of collisions and argue that this mechanism can explain both the suppression of MIPS found here for rodlike particles and the enhancement of MIPS found for particles with Vicsek interactions.
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28 April 2019
Research Article|
April 22 2019
Interparticle torques suppress motility-induced phase separation for rodlike particles
Special Collection:
Chemical Physics of Active Matter
Robin van Damme
;
Robin van Damme
1
Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University
, Princetonplein 1, 3584 CC Utrecht, The Netherlands
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Jeroen Rodenburg
;
Jeroen Rodenburg
2
Institute for Theoretical Physics, Utrecht University
, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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René van Roij
;
René van Roij
2
Institute for Theoretical Physics, Utrecht University
, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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Marjolein Dijkstra
Marjolein Dijkstra
1
Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University
, Princetonplein 1, 3584 CC Utrecht, The Netherlands
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Note: This article is part of the Special Topic “Chemical Physics of Active Matter” in J. Chem. Phys.
J. Chem. Phys. 150, 164501 (2019)
Article history
Received:
December 22 2018
Accepted:
March 28 2019
Citation
Robin van Damme, Jeroen Rodenburg, René van Roij, Marjolein Dijkstra; Interparticle torques suppress motility-induced phase separation for rodlike particles. J. Chem. Phys. 28 April 2019; 150 (16): 164501. https://doi.org/10.1063/1.5086733
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