Diffusiophoresis of ionic catalytic particles

Авторы: Asmolov Evgeny S., Vinogradova Olga I.
Журнал: Physics of Fluids
Том: 36
Номер: 9
Год издания: 2024
Издательство: AIP Publishing
Местоположение издательства: United States
Номер статьи: 092026
DOI: 10.1063/5.0216467
Аннотация: A migration of charged particles relative to a solvent, caused by a gradient of salt concentrationand termed a diffusiophoresis, is of much interest being exploited in many fields. Existing theoriesdeal with diffusiophoresis of passive inert particles. In this paper, we extend prior models by focusingon a particle, which is both passive and catalytic, by postulating an uniform ion release over itssurface.We derive an expression for a particle velocity depending on a dimensionless ion flux(Damk¨ohler number Da) and show that a charged region is formed at distances of the order of theparticle size, provided the diffusion coefficients of anions and cations are unequal. When Da becomeslarge enough, the contribution of this (outer) region to the particle velocity dominates. In this casethe speed of catalytic passive particles augments linearly with Da and is inversely proportional to thesquare of electrolyte concentration. As a result, they always migrate towards a high concentrationregion and in dilute solutions become much faster than inert (non-catalytic) ones.
Добавил в систему: Асмолов Евгений Савельевич

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