Transport of active ellipsoidal particles in ratchet potentials

Abstract

Rectified transport of active ellipsoidal particles is numerically investigated in a two-dimensional asymmetric potential. The out-of-equilibrium condition for the active particle is an intrinsic property, which can break thermodynamical equilibrium and induce the directed transport. It is found that the perfect sphere particle can facilitate the rectification, while the needlelike particle destroys the directed transport. There exist optimized values of the parameters (the self-propelled velocity, the torque acting on the body) at which the average velocity takes its maximal value. For the ellipsoidal particle with not large asymmetric parameter, the average velocity decreases with increasing the rotational diffusion rate, while for the needlelike particle (very large asymmetric parameter), the average velocity is a peaked function of the rotational diffusion rate. By introducing a finite load, particles with different shapes (or different self-propelled velocities) will move to the opposite directions, which is able to separate particles of different shapes (or different self-propelled velocities).

7pages, 8 figures

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• Inclusions, Boundaries and Disorder in Scalar Active Matter
• Activated barrier crossing dynamics of a Janus particle carrying cargo
• Pattern Formation and Transport for Externally Driven Active Matter on Periodic Substrates
• Mechanochemical Active Ratchet
• Particle-Wall Alignment Interaction and Active Brownian Diffusion Through Narrow Channels
• Diffusion dynamics of an overdamped active ellipsoidal particle in two dimensions
• Curvature induces and enhances transport of spinning colloids through narrow channels
• Nanoswimmers in a ratchet potential: Effects of a transverse rocking force
• Effect of Convection Rolls in Motility-Induced Phase Separation of Active Janus Particles