受移动障碍物阵列驱动的颗粒输运。

Transport of particles driven by the traveling obstacle arrays.

机构信息

Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.

Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.

出版信息

J Chem Phys. 2018 Nov 7;149(17):174906. doi: 10.1063/1.5049719.

DOI:10.1063/1.5049719

PMID:30409003

Abstract

Transport of three types of particles (passive particles, active particles without polar interaction, and active particles with polar interaction) is numerically investigated in the presence of traveling obstacle arrays. The transport behaviors are different for different types of particles. For passive particles, there exists an optimal traveling speed (or the translational diffusion) at which the average velocity of particles takes its maximum value. For active particles without polar interaction, the average velocity of particles is a peaked function of the obstacle traveling speed. The average velocity decreases monotonically with increase of the rotational diffusion for large driving speed, while it is a peaked function of the rotational diffusion for small driving speed. For active particles with polar interaction, interestingly, within particular parameter regimes, active particles can move in the opposite direction to the obstacles. The average velocity of particles can change its direction by changing the system parameters (the obstacles driving speed, the polar interaction strength, and the rotational diffusion).

摘要

三种类型的粒子（被动粒子、无极性相互作用的主动粒子和有极性相互作用的主动粒子）在移动障碍物阵列的存在下进行了数值研究。不同类型的粒子具有不同的输运行为。对于被动粒子，存在一个最佳的行进速度（或平动扩散），在此速度下粒子的平均速度达到最大值。对于无极性相互作用的主动粒子，粒子的平均速度是障碍物行进速度的峰值函数。对于较大的驱动速度，平均速度随旋转扩散的增加而单调下降，而对于较小的驱动速度，平均速度是旋转扩散的峰值函数。对于具有极性相互作用的主动粒子，有趣的是，在特定的参数范围内，主动粒子可以朝着与障碍物相反的方向移动。通过改变系统参数（障碍物驱动速度、极性相互作用强度和旋转扩散），粒子的平均速度可以改变其方向。