Activity-assisted barrier-crossing of self-propelled colloids over parallel microgrooves

Abstract

We report a systematic study of the dynamics of self-propelled particles (SPPs) over a one-dimensional periodic potential landscape, which is fabricated on a microgroove-patterned polydimethylsiloxane (PDMS) substrate. From the measured non-equilibrium probability density function of the SPPs, we find that the escape dynamics of the slow-rotating SPPs across the potential landscape can be described by an effective potential, once the self-propulsion force is included into the potential under the fixed angle approximation. This work demonstrates that the parallel microgrooves provide a versatile platform for a quantitative understanding of the interplay among the self-propulsion force, spatial confinement by the potential landscape, and thermal noise, as well as its effects on activity-assisted escape dynamics and transport of the SPPs.

References in corpus (21)

• Active Particles in Complex and Crowded Environments
• Self-motile colloidal particles: from directed propulsion to random walk
• The Mechanics and Statistics of Active Matter
• How far from equilibrium is active matter?
• Microswimmers in Patterned Environments
• Sedimentation of active colloidal suspensions
• Diffusive transport without detailed balance in motile bacteria: Does microbiology need statistical physics?
• Emergent behavior in active colloids
• Topographical pathways guide chemical microswimmers
• Active Brownian Particles and Run-and-Tumble Particles: a Comparative Study
• Photoactivated Colloidal Dockers for Cargo Transportation
• Generalized energy equipartition in harmonic oscillators driven by active baths
• Minimal model of active colloids highlights the role of mechanical interactions in controlling the emergent behavior of active matter
• Time-(ir)reversibility in active matter: from micro to macro
• Activated escape of a self-propelled particle from a metastable state
• Escape rate of active particles in the effective equilibrium approach
• Sedimentation of self-propelled Janus colloids: polarization and pressure
• Kramers escape of a self-propelled particle
• Active Colloids in Harmonic Optical Potentials
• Non-equilibrium Properties of an Active Nanoparticle in a Harmonic Potential
• Active colloidal propulsion over a crystalline surface

Cited by in corpus (2)

• Depinning transition of self-propelled particles
• Two-Dimensional Active Brownian Particles Crossing a Parabolic Barrier: Finite Rectangular Domain with Absorbing Boundary Conditions