2026-04-17T03:15:29Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1823412025-11-19T20:25:46Zcom_2072_1057col_2072_478822col_2072_478902col_2072_478914col_2072_478917

00925njm 22002777a 4500 dc Corato, Marco de author Arqué, Xavier author Patiño, Tania author Arroyo, Marino author Sanchez, Samuel author Pagonabarraga Mora, Ignacio author 2022-01-13T18:21:25Z 2022-01-13T18:21:25Z 2020-03-13 2022-01-12T12:04:19Z 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. Col·loides Física de partícules Experiments Colloids Particle physics Experiments Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments