Transport of the obstacle lattice with topographical gradients driven by chiral active particles

Abstract

The transport of the obstacle lattice with topographic gradients in the $y$ direction within a two-dimensional channel is numerically studied under the influence of chiral active particles. The asymmetry of the obstacle lattice and the chirality of the active particles result in directional transport of the obstacle lattice along the longitudinal direction. The obstacle lattice and the chiral active particles move in opposite directions, with their transport direction governed by the chirality of the active particles. The average velocity magnitudes of the chiral active particles and the obstacle lattice exhibit similar trends concerning angular velocity, self-propulsion speed, translational and rotational diffusion coefficient. However, distinct behaviors emerge as the numbers of obstacle particles and active particles vary. Notably, the ratio of the average velocity magnitude of obstacle particles to that of active particles equals the ratio of active particles to obstacle particles. These findings offer insights for the design of advanced smart materials and the development of targeted drug delivery systems.