Self-Organization of Binary Colloidal Mixtures via Diffusiophoresis

Catalytic activity of the colloids and chemotactic response to gradients of the chemicals in the solution leads to effective interaction between catalytic colloids. In this paper, we simulate mixtures of active and passive colloids via a Brownian dynamics algorithm. These particles interact via phor...

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Published inFrontiers in chemistry Vol. 10; p. 803906
Main Authors Lei, Lijie, Wang, Shuo, Zhou, Xuemao, Ghellab, Salah Eddine, Lin, Guanhua, Gao, Yongxiang
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 10.03.2022
Subjects
active colloids
Brownian dynamics
Chemistry
diffusiophoresis
nonreciprocal interaction
self-assembly
active colloids
self-assembly
Brownian dynamics
diffusiophoresis
nonreciprocal interaction
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Summary:Catalytic activity of the colloids and chemotactic response to gradients of the chemicals in the solution leads to effective interaction between catalytic colloids. In this paper, we simulate mixtures of active and passive colloids via a Brownian dynamics algorithm. These particles interact via phoretic interactions, which are determined by two independent parameters, surface activity and surface mobility. We find rich dynamic structures by tuning passive colloids' surface mobility, size, and area fractions, which include schools of active colloids with exclusion zone, yolk/shell cluster, and stable active-passive alloys to motile clusters. Dynamical cluster can also be formed due to the nonreciprocity of the phoretic interaction. Increasing the size ratio of passive colloids to active colloids favors the phase separation of active and passive colloids, resulting in yolk/shell structure. Increasing the area fraction of active colloids tends to transfer from dynamical clusters into stable alloys. The simulated binary active colloid systems exhibit intriguing nonequilibrium phenomena that mimic the dynamic organizations of active/passive systems.
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This article was submitted to Physical Chemistry and Chemical Physics, a section of the journal Frontiers in Chemistry
Edited by: Lijuan Zhang, Shanghai Advanced Research Institute (CAS), China
Reviewed by: Lei Wang, Harbin Institute of Technology, China
Ming Shen, Yangzhou University, China
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2022.803906