Self-diffusiophoresis of Janus particles that release ions

Autor:	Evgeny S. Asmolov, Tatiana V. Nizkaya, Olga I. Vinogradova
Rok vydání:	2022
Předmět:	Fluid Flow and Transfer Processes Mechanics of Materials Mechanical Engineering Fluid Dynamics (physics.flu-dyn) Computational Mechanics Soft Condensed Matter (cond-mat.soft) FOS: Physical sciences Physics - Fluid Dynamics Condensed Matter - Soft Condensed Matter Condensed Matter Physics
Zdroj:	Physics of Fluids. 34:032011
ISSN:	1089-7666 1070-6631
Popis:	Catalytic Janus swimmers demonstrate a diffusio-phoretic motion by self-generating the gradients of concentrations and electric potential. Recent work has focused on simplified cases, such as a release of solely one type of ions or low surface fluxes of ions, with limited theoretical guidance. Here, we consider the experimentally relevant case of particles that release both types of ions, and obtain a simple expression for a particle velocity in the limit of thin electrostatic diffuse layer. Our approximate expression is very accurate even when ion fluxes and surface potentials are large, and allows one to interpret a number of intriguing phenomena, such as the reverse in the direction of the particle motion in response to variations of the salt concentration or self-diffusiophoresis of uncharged particles. Comment: 9 pages, 7 figures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9cd31c5bcd6bd851af5ea15112bda66 https://doi.org/10.1063/5.0085746 Zobrazit plný text záznamu