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Electrophoretic velocity of ion-releasing colloidal particlesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Asmolov Evgeny S., Vasileva Victoria A., Vinogradova Olga I.
- Журнал: Physics of Fluids
- Том: 36
- Номер: 12
- Год издания: 2024
- Издательство: AIP Publishing
- Местоположение издательства: United States
- Номер статьи: 127128
- DOI: 10.1063/5.0243191
- Аннотация: By means of a matched asymptotic expansions approach the electrophoretic velocity and zeta potential of a catalytic particle that uniformly releases ions have been investigated. Attention is focused on large, compared to diffuse layer, particles characterized by the surface potential Fi_s and Damköhler number Da. The latter represents the ratio of the surface reaction rate to the diffusive transfer one. For vanishing Da, we recover the classical Smoluchowski formula for the electrophoretic velocity, which states that the zeta potential of the particle is equal to Fi_s and that the migration direction is determined by its sign. For small values of Da we show that the migration velocity is controlled mostly by Fi_s and affected by an ion release only slightly. However, even small Da can induce the electrophoresis of electro-neutral particles that would be immobile if inert. For larger Da the direction of migration and the sign of zeta potential become independent of Fi_s and are solely determined by the difference in diffusivity of released cations and anions. Still, the surface potential affects the magnitude of the particle velocity.
- Добавил в систему: Асмолов Евгений Савельевич
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