Carregant...
Tipus de document
ArticleVersió
Versió acceptadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/182341
Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
We study the self-propulsion of a charged colloidal particle that releases ionic species using theory and experiments. We relax the assumptions of thin Debye length and weak nonequilibrium effects assumed in classical phoretic models. This leads to a number of unexpected features that cannot be rationalized considering the classic phoretic framework: an active particle can reverse the direction of motion by increasing the rate of ion release and can propel even with zero surface charge. Our theory predicts that there are optimal conditions for self-propulsion and a novel regime in which the velocity is insensitive to the background electrolyte concentration. The theoretical results quantitatively capture the salt-dependent velocity measured in our experiments using active colloids that propel by decomposing urea via a surface enzymatic reaction.
Matèries
Matèries (anglès)
Citació
Citació
CORATO, Marco de, ARQUÉ, Xavier, PATIÑO, Tania, ARROYO, Marino, SANCHEZ, Samuel, PAGONABARRAGA MORA, Ignacio. Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments. _Physical Review Letters_. 2020. Vol. 124, núm. 10, pàgs. 108001. [consulta: 21 de gener de 2026]. ISSN: 1079-7114. [Disponible a: https://hdl.handle.net/2445/182341]