2021/12/24 by Vivek Semwal, Semwal, Vivek, Jay Prakash +3 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Biological Physics (physics.bio-ph) #FOS: Physical sciences #Micro and Nano Robotics #Pickering emulsions and particle stabilization #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.2112.13015
openalex publication_date 2021/12/24 · openalex created_date 2021/12/31 · openalex updated_date 2026/07/28
We study a binary mixture of disk-shaped \it active run and tumble particles (ARNPs) and passive particles on a two-dimensional substrate. Both types of particles are athermal. The particles interact through the soft repulsive potential. The activity of ARNPs is controlled by tuning their tumbling rate. The system is studied for various sizes of passive particles keeping size of ARNPs fixed. Hence the variables are, size ratio (S) of passive particles and ARNPs, and activity of ARNPs is v. The characterstics dynamics of both ARNPs and passive particles show a crossover from early time ballistic to later time diffusive. Furthermore, we observed that passive particles dynamics changes from diffusive to subdiffusive with respect to their size. Moreover, late time effective diffusivity Deff of passive particles decreases with increasing their size as in the corresponding equilibrium Stokes systems. We calculated the effective temperatures, using Deff, Ta,eff(Δ) and also using speed distribution Ta,eff(v) and compared them. The both Ta,eff(Δ) and Ta,eff(v) increases linearly with activity and are in agreement with each other. Hence we can say that an effective equilibrium can be establish in such binary mixture. Our study can be useful to study the various biological systems like; dynamics of passive organels in cytoplasm, colloids etc.