2009/03/18 by J. Tailleur, M. E. Cates · 2 citations
Engineering · Materials Science · Physics and Astronomy · #Micro and Nano Robotics #Particle Dynamics in Fluid Flows #Pickering emulsions and particle stabilization #cond-mat.stat-mech
paper · pdf · doi:10.1209/0295-5075/86/60002
published as EPL 86, 60002 (2009)
arxiv created 2009/03/18 · openalex publication_date 2009/06/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The run-and-tumble dynamics of bacteria, as exhibited by E. coli , offers a simple experimental realization of non-Brownian, yet diffusive, particles. Here we present some analytic and numerical results for models of the ideal (low-density) limit in which the particles have no hydrodynamic or other interactions and hence undergo independent motions. We address three cases: sedimentation under gravity; confinement by a harmonic external potential; and rectification by a strip of "funnel gates" which we model by a zone in which tumble rate depends on swim direction. We compare our results with recent experimental and simulation literature and highlight similarities and differences with the diffusive motion of colloidal particles.