Diffusion of a chemically active colloidal particle in composite channels
Xin Lou(娄辛)1,2, Rui Liu(刘锐)2,1, Ke Chen(陈科)2,1,3, Xin Zhou(周昕)1,4,†, Rudolf Podgornik1,2,4,‡, and Mingcheng Yang(杨明成)2,1,3,§
1 School of Physical Sciences, 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 Songshan Lake Materials Laboratory, Dongguan 523808, China; 4 Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
Abstract Diffusion of colloidal particles in microchannels has been extensively investigated, where the channel wall is either a no-slip or a slip-passive boundary. However, in the context of active fluids, driving boundary walls are ubiquitous and are expected to have a substantial effect on the particle dynamics. By mesoscale simulations, we study the diffusion of a chemically active colloidal particle in composite channels, which are constructed by alternately arranging the no-slip and diffusio-osmotic boundary walls. In this case, the chemical reaction catalyzed by the active colloidal particle creates a local chemical gradient along the channel wall, which drives a diffusio-osmotic flow parallel to the wall. We show that the diffusio-osmotic flow can significantly change the spatial distribution and diffusion dynamics of the colloidal particle in the composite channels. By modulating the surface properties of the channel wall, we can achieve different patterns of colloidal position distribution. The findings thus propose a novel possibility to manipulate colloidal diffusion in microfluidics, and highlight the importance of driving boundary walls in dynamics of colloidal particles in microchannels.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11874397, 11674365, and 11774393) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33000000).
Corresponding Authors:
Xin Zhou, Rudolf Podgornik, Mingcheng Yang
E-mail: xzhou@ucas.ac.cn;rudipod@gmail.com;mcyang@iphy.ac.cn
Cite this article:
Xin Lou(娄辛), Rui Liu(刘锐), Ke Chen(陈科), Xin Zhou(周昕), Rudolf Podgornik, and Mingcheng Yang(杨明成) Diffusion of a chemically active colloidal particle in composite channels 2022 Chin. Phys. B 31 044704
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