000148276 001__ 148276 000148276 005__ 20250115160155.0 000148276 0247_ $$2doi$$a10.1103/PhysRevLett.124.108001 000148276 0248_ $$2sideral$$a135320 000148276 037__ $$aART-2020-135320 000148276 041__ $$aeng 000148276 100__ $$0(orcid)0000-0002-9361-4794$$aDe Corato, Marco$$uUniversidad de Zaragoza 000148276 245__ $$aSelf-Propulsion of Active Colloids via Ion Release: Theory and Experiments 000148276 260__ $$c2020 000148276 5060_ $$aAccess copy available to the general public$$fUnrestricted 000148276 5203_ $$aWe 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. 000148276 536__ $$9info:eu-repo/grantAgreement/EC/H2020/712754/EU/Postdoctoral Programme in Bioengineering Excellence Scientific Training/BEST$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 712754-BEST$$9info:eu-repo/grantAgreement/ES/MINECO/SEV-2014-0425 000148276 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000148276 590__ $$a9.161$$b2020 000148276 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b7 / 84 = 0.083$$c2020$$dQ1$$eT1 000148276 592__ $$a3.688$$b2020 000148276 593__ $$aPhysics and Astronomy (miscellaneous)$$c2020$$dQ1 000148276 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000148276 700__ $$aArqué, Xavier 000148276 700__ $$aPatiño, Tania 000148276 700__ $$aArroyo, Marino 000148276 700__ $$aSánchez, Samuel 000148276 700__ $$aPagonabarraga, Ignacio 000148276 7102_ $$15001$$2600$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Mecánica de Fluidos 000148276 773__ $$g124, 10 (2020), 108001 [6 pp.]$$pPhys. rev. lett.$$tPhysical Review Letters$$x0031-9007 000148276 8564_ $$s788602$$uhttps://zaguan.unizar.es/record/148276/files/texto_completo.pdf$$yPostprint 000148276 8564_ $$s2782601$$uhttps://zaguan.unizar.es/record/148276/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000148276 909CO $$ooai:zaguan.unizar.es:148276$$particulos$$pdriver 000148276 951__ $$a2025-01-15-15:06:18 000148276 980__ $$aARTICLE