000160796 001__ 160796 000160796 005__ 20251017144558.0 000160796 0247_ $$2doi$$a10.1021/acs.nanolett.5c01567 000160796 0248_ $$2sideral$$a144012 000160796 037__ $$aART-2025-144012 000160796 041__ $$aeng 000160796 100__ $$aXiao, Zuyao 000160796 245__ $$aIonic diffusiophoresis of active colloids via galvanic exchange reactions 000160796 260__ $$c2025 000160796 5060_ $$aAccess copy available to the general public$$fUnrestricted 000160796 5203_ $$aIn order to move toward realistic applications by extending active matter propulsion reactions beyond the classical catalytic hydrogen peroxide decomposition, we investigate the self-propulsion mechanism of Janus particles. To address the influences of ionic species, we investigate Janus particles driven by a galvanic exchange reaction that consumes and produces ions on one hemisphere. Our galvanophoretic experiments in the regime of thin Debye layers confirm that even the simplest models in active matter are still full of important surprises. We find a logarithmic speed dependence on the fuel concentration, which cannot be explained using the classic ionic self-diffusiophoretic framework. Instead, an approach based on the Poisson–Nernst–Planck equations yields a better agreement with the experiments. We attribute the discrepancy between the two models to the breakdown of two key hypotheses of the ionic self-diffusiophoretic approach. 000160796 536__ $$9info:eu-repo/grantAgreement/ES/MCIU/PID2022-139803NB-I00$$9info:eu-repo/grantAgreement/ES/MCINN/PID2021-126570NB-I00$$9info:eu-repo/grantAgreement/ES/MICINN/RYC2021-030948-I 000160796 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es 000160796 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000160796 700__ $$aSimmchen, Juliane 000160796 700__ $$aPagonabarraga, Ignacio 000160796 700__ $$0(orcid)0000-0002-9361-4794$$aCorato, Marco de$$uUniversidad de Zaragoza 000160796 7102_ $$15001$$2600$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Mecánica de Fluidos 000160796 773__ $$g25, 19 (2025), 7975-7980$$pNano lett.$$tNano Letters$$x1530-6984 000160796 8564_ $$s3104985$$uhttps://zaguan.unizar.es/record/160796/files/texto_completo.pdf$$yVersión publicada 000160796 8564_ $$s3056064$$uhttps://zaguan.unizar.es/record/160796/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000160796 909CO $$ooai:zaguan.unizar.es:160796$$particulos$$pdriver 000160796 951__ $$a2025-10-17-14:13:47 000160796 980__ $$aARTICLE