A fresh view on phoresis and self-phoresis |
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| Institution: | 1. Física Teórica, Universidad de Sevilla, Apdo. 1065, 41080 Sevilla, Spain;2. Instituto Carlos I de Física Teórica y Computacional, 18071 Granada, Spain;3. Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany;1. College of Optical and Electronic Technology, International Science and Technology Cooperation Base of Micro-nano Fabrication and Optoelectronic Detection, Ministry of Science and Technology, China Jiliang University, Hangzhou 310018, China;2. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, College of Energy, IChEM, Xiamen University, Xiamen 361005, China;3. Department of Chemistry and Environment Science, Fujian Province University Key Laboratory of Analytical Science, Minnan Normal University, Zhangzhou 363000, China;4. Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China;1. Key Laboratory of Microsystems and Microstructures Manufacturing (Ministry of Education), School of Medicine and Health, Harbin Institute of Technology, YiKuangJie 2, Harbin 150080, China;2. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325000, China; Oujiang Laboratory, Wenzhou 325000, China |
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| Abstract: | Phoresis, a classic example of particle transport driven by thermodynamic gradients, is enjoying a resurgent research interest motivated both by technological developments and by its relevance to the motility of chemically active particles. Here we succinctly review, using the case of chemophoresis (also called diffusiophoresis), the general framework of phoresis and self-phoresis formulated as a Stokes-flow problem for a liquid solution (solvent and solute) maintained out of thermodynamic equilibrium by solute gradients. Within the constraints of local equilibrium, we discuss the simplest extension of the theory in order to account for correlations in the fluid. We show that this leads to a shift from the paradigm based on the ideal case, in that self-phoresis can no longer be represented as phoresis in a self-generated composition gradient. Our review concludes with a concise overview of a few directions which we think hold the potential to reveal a rich behavior in future investigations. |
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| Keywords: | Phoresis Stokes flow Diffusion Active colloid |
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