Estimation of the critical behavior in an active colloidal system with Vicsek-like interactions

Abstract

We study numerically the critical behavior of a modified, active Asakura-Oosawa model for colloid-polymer mixtures. The colloids are modeled as self-propelled particles with Vicsek-like interactions. This system undergoes phase separation between a colloid-rich and a polymer-rich phase, whereby the phase diagram depends on the strength of the Vicsek-like interactions. Employing a subsystem-block-density distribution analysis, we determine the critical point and make an attempt to estimate the critical exponents. In contrast to the passive model, we find that the critical point is not located on the rectilinear diameter. A first estimate of the critical exponents $\beta$ and $\nu$ is consistent with the underlying 3d-Ising universality class observed for the passive model.

9 pages, 8 figures

References in corpus (13)

• Novel type of phase transition in a system of self-driven particles
• Self-motile colloidal particles: from directed propulsion to random walk
• Interaction Ruling Animal Collective Behaviour Depends on Topological rather than Metric Distance: Evidence from a Field Study
• Motility-Induced Phase Separation
• Spontaneous motion in hierarchically assembled active matter
• Activity-induced phase separation and self-assembly in mixtures of active and passive particles
• Pattern formation in self-propelled particles with density-dependent motility
• Spontaneously ordered motion of self-propelled particles
• Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions
• Active colloidal suspensions: Clustering and phase behavior
• New aspects of the continuous phase transition in the scalar noise model (SNM) of collective motion
• Critical phenomena in colloid-polymer mixtures: interfacial tension, order parameter, susceptibility and coexistence diameter
• Statics and Dynamics of Colloid-Polymer Mixtures Near Their Critical Point of Phase Separation: A Computer Simulation Study of a Continuous AO Model

Cited by in corpus (2)

• Statistical mechanics of transport processes in active fluids: Equations of hydrodynamics
• Relaxation in a Phase-separating Two-dimensional Active Matter System with Alignment Interaction