Artículo
Transition from Scattering to Orbiting upon Increasing the Fuel Concentration for an Active Janus Colloid Moving at an Obstacle-decorated Interface
Autor/es | van Baalen, Carolina
Uspal, William E. Popescu, Mihail N. Isa, Lucio |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2023 |
Fecha de depósito | 2024-05-22 |
Publicado en |
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Resumen | Efficient exploration of space is a paramount motive for active colloids in practical applications. Yet, introducing activity may lead to surface-bound states, hindering efficient space exploration. Here, we show that the ... Efficient exploration of space is a paramount motive for active colloids in practical applications. Yet, introducing activity may lead to surface-bound states, hindering efficient space exploration. Here, we show that the interplay between self-motility and fuel-dependent affinity for surfaces affects how efficiently catalytically-active Janus microswimmers explore both liquid-solid and liquid-fluid interfaces decorated with arrays of similarly-sized obstacles. In a regime of constant velocity vs. fuel concentration, we find that microswimmer-obstacle interactions strongly depend on fuel concentration, leading to a counter-intuitive decrease in space exploration efficiency with increased available fuel for all interfaces. Using experiments and theoretical predictions, we attribute this phenomenon to a largely overlooked change in the surface properties of the microswimmers' catalytic cap upon H2O2 exposure. Our findings have implications in the interpretation of experimental studies of catalytically active colloids, as well as in providing new handles to control their dynamics in complex environments. |
Agencias financiadoras | European Union (UE). H2020 National Science Foundation (NSF). United States Army Research Office. United States Junta de Andalucía |
Identificador del proyecto | 812780
![]() 101001514 ![]() 2201428 ![]() 2232862 ![]() W911NF-23-1-0190 ![]() PID2021-126348N ![]() |
Cita | van Baalen, C., Uspal, W.E., Popescu, M.N. y Isa, L. (2023). Transition from Scattering to Orbiting upon Increasing the Fuel Concentration for an Active Janus Colloid Moving at an Obstacle-decorated Interface. Soft Matter, 19 (45), 8790-8801. https://doi.org/10.1039/d3sm01079a. |
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