Transport and diffusion of paramagnetic ellipsoidal particles in a rotating magnetic field

Jing-jing Liao, Wei-jing Zhu, and Bao-quan Ai
Phys. Rev. E 97, 062151 – Published 28 June 2018

Abstract

Transport and diffusion of paramagnetic ellipsoidal particles under the action of a rotating magnetic field are numerically investigated in a two-dimensional channel. It is found that paramagnetic ellipsoidal particles in a rotating magnetic field can be rectified in the upper-lower asymmetric channel. The transport and the effective diffusion coefficient are much more different and complicated for active particles, while they have similar behaviors and change a little when applying rotating magnetic fields of different frequencies for passive particles. For active particles, the back-and-forth rotational motion facilitates the effective diffusion coefficient and reduces the rectification, whereas the rotational motion synchronous with the magnetic field suppresses the effective diffusion coefficient and enhances the rectification. There exist optimized values of the parameters (the anisotropic degree, the amplitude and frequency of magnetic field, the self-propelled velocity, and the rotational diffusion rate) at which the average velocity and diffusion take their maximal values. Particles with different shapes, self-propelled speeds, or rotational diffusion rates will move to the opposite directions and can be separated by applying rotating magnetic fields of suitable strength and frequency. Our results can be used to separate particles, orient the particles along any direction at will during motion, and control the particle diffusion.

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  • Received 1 May 2018

DOI:https://doi.org/10.1103/PhysRevE.97.062151

©2018 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & Thermodynamics

Authors & Affiliations

Jing-jing Liao1,2, Wei-jing Zhu1, and Bao-quan Ai1,*

  • 1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
  • 2College of Applied Science, Jiangxi University of Science and Technology, Ganzhou 341000, China

  • *aibq@scnu.edu.cn

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Issue

Vol. 97, Iss. 6 — June 2018

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