Huan Liang(梁欢)1,2, Peng Liu(刘鹏)1,2,3, Fangfu Ye(叶方富)1,2,3,4,†, and Mingcheng Yang(杨明成)1,2,4,‡
1. Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China; 2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China; 4. Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract Thermophoresis and diffusiophoresis respectively refer to the directed drift of suspended particles in solutions with external thermal and chemical gradients, which have been widely used in the manipulation of mesoscopic particles. We here study a phoretic-like motion of a passive colloidal particle immersed in inhomogeneous active baths, where the thermal and chemical gradients are replaced separately by activity and concentration gradients of the active particles. By performing simulations, we show that the passive colloidal particle experiences phoretic-like forces that originate from its interactions with the inhomogeneous active fluid, and thus drifts along the gradient field, leading to an accumulation. The results are similar to the traditional phoretic effects occurring in passive colloidal suspensions, implying that the concepts of thermophoresis and diffusiophoresis could be generalized into active baths.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11874397) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33000000).
Corresponding Authors:
Fangfu Ye, Mingcheng Yang
E-mail: fye@iphy.ac.cn;mcyang@iphy.ac.cn
Cite this article:
Huan Liang(梁欢), Peng Liu(刘鹏), Fangfu Ye(叶方富), and Mingcheng Yang(杨明成) Active thermophoresis and diffusiophoresis 2022 Chin. Phys. B 31 104702
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