A composite micromotor driven by self-thermophoresis and Brownian rectification

doi:10.1088/1674-1056/ac2727

中国物理B ›› 2021, Vol. 30 ›› Issue (11): 114702-114702.doi: 10.1088/1674-1056/ac2727

A composite micromotor driven by self-thermophoresis and Brownian rectification

Xin Lou(娄辛)^1,2, Nan Yu(余楠)^1,2,3, Ke Chen(陈科)^1,2,4, Xin Zhou(周昕)^1,5, Rudolf Podgornik^1,2,5,†, and Mingcheng Yang(杨明成)^1,2,4,‡

1 University of Chinese Academy of Sciences, Beijing 100049, China;
2 Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China;
5 Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China

收稿日期:2021-08-17 修回日期:2021-09-06 接受日期:2021-09-16 出版日期:2021-10-13 发布日期:2021-10-27
通讯作者: Rudolf Podgornik, Mingcheng Yang E-mail:rudipod@gmail.com;mcyang@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11874397 and 11674365).

A composite micromotor driven by self-thermophoresis and Brownian rectification

Xin Lou(娄辛)^1,2, Nan Yu(余楠)^1,2,3, Ke Chen(陈科)^1,2,4, Xin Zhou(周昕)^1,5, Rudolf Podgornik^1,2,5,†, and Mingcheng Yang(杨明成)^1,2,4,‡

1 University of Chinese Academy of Sciences, Beijing 100049, China;
2 Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China;
5 Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China

Received:2021-08-17 Revised:2021-09-06 Accepted:2021-09-16 Online:2021-10-13 Published:2021-10-27
Contact: Rudolf Podgornik, Mingcheng Yang E-mail:rudipod@gmail.com;mcyang@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11874397 and 11674365).

摘要/Abstract

摘要： Brownian motors and self-phoretic microswimmers are two typical micromotors, for which thermal fluctuations play different roles. Brownian motors utilize thermal noise to acquire unidirectional motion, while thermal fluctuations randomize the self-propulsion of self-phoretic microswimmers. Here we perform mesoscale simulations to study a composite micromotor composed of a self-thermophoretic Janus particle under a time-modulated external ratchet potential. The composite motor exhibits a unidirectional transport, whose direction can be reversed by tuning the modulation frequency of the external potential. The maximum transport capability is close to the superposition of the drift speed of the pure Brownian motor and the self-propelling speed of the pure self-thermophoretic particle. Moreover, the hydrodynamic effect influences the orientation of the Janus particle in the ratched potential, hence also the performance of the composite motor. Our work thus provides an enlightening attempt to actively exploit inevitable thermal fluctuations in the implementation of the self-phoretic microswimmers.

关键词: Brownian motors, self-phoretic microswimmers, thermal noise, hydrodynamic effect

Abstract: Brownian motors and self-phoretic microswimmers are two typical micromotors, for which thermal fluctuations play different roles. Brownian motors utilize thermal noise to acquire unidirectional motion, while thermal fluctuations randomize the self-propulsion of self-phoretic microswimmers. Here we perform mesoscale simulations to study a composite micromotor composed of a self-thermophoretic Janus particle under a time-modulated external ratchet potential. The composite motor exhibits a unidirectional transport, whose direction can be reversed by tuning the modulation frequency of the external potential. The maximum transport capability is close to the superposition of the drift speed of the pure Brownian motor and the self-propelling speed of the pure self-thermophoretic particle. Moreover, the hydrodynamic effect influences the orientation of the Janus particle in the ratched potential, hence also the performance of the composite motor. Our work thus provides an enlightening attempt to actively exploit inevitable thermal fluctuations in the implementation of the self-phoretic microswimmers.

Key words: Brownian motors, self-phoretic microswimmers, thermal noise, hydrodynamic effect

中图分类号: (Complex fluids and colloidal systems)

47.57.-s

66.10.cd (Thermal diffusion and diffusive energy transport) 02.70.Ns (Molecular dynamics and particle methods)

Xin Lou(娄辛), Nan Yu(余楠), Ke Chen(陈科), Xin Zhou(周昕), Rudolf Podgornik, and Mingcheng Yang(杨明成). A composite micromotor driven by self-thermophoresis and Brownian rectification[J]. 中国物理B, 2021, 30(11): 114702-114702.

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A composite micromotor driven by self-thermophoresis and Brownian rectification

A composite micromotor driven by self-thermophoresis and Brownian rectification

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