Collective dynamics of active circle-swimming Lennard–Jones particles

Abstract

We report a numerical study on collective dynamics of self-propelling and circle-swimming Lennard- Jones (LJ) particles in two dimensions using Brownian dynamics simulations. We investigate the combined role of attraction,...

Collective behavior of passive and active circle swimming particle mixtures

“…The presence of rotation or circle-swimming behavior suppresses or delays MIPS, as shown by Hrishikesh and Mani. 37 Along with these results, the present study reports the effect of passive particles, which are not self-propelling but otherwise identical to active particles, on the phase behaviour of the binary mixture.…”

“…36 Our previous work has also shown that for attractive circle swimming systems, MIPS is delayed in the combination of active rotation, self-propulsion and attraction. 37 This effect is similar to the suppression of MIPS by the presence of hydrodynamic interactions in a soft repulsive system observed by Matas-Navarro et al 38 Torques introduced by hydrodynamic interactions cause the particles to undergo larger rotations for each collision, thus preventing the collisional slowing down that forms the basis for MIPS. Recent studies have shown that active rotation interrupts MIPS due to dynamical clustering at finite length scales.…”

“…In the absence of passive particles, we have seen that for a system of rotating attractive active particles at ε * = 3 and at Pe = 70, a gas–liquid phase separated state is produced, which is destabilised with the increase in ω *. 37 When active rotation is high enough, clustering is suppressed because of the increased tendency of particles to escape. However, the presence of attraction prevents complete destabilisation of the phase separated domain.…”

Collective behavior of chiral active particles with anisotropic interactions in a confined space

“…The majority of the current studies make an isotropic assumption where particles interact via steric repulsion. [42][43][44][45][46] However noticeably, a rather different phenomenology is observed when the considered particles are subject to directional interactions, either because of a non-spherical geometry of the particle 47,48 or as a result of explicit anisotropic interaction potentials. 49,50 Janus particles consisting of two sides of different chemistry and/or polarity are known as anisotropic.…”