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Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface

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 affec...

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Detalles Bibliográficos
Autores principales: van Baalen, Carolina, Uspal, William E., Popescu, Mihail N., Isa, Lucio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10663988/
https://www.ncbi.nlm.nih.gov/pubmed/37946586
http://dx.doi.org/10.1039/d3sm01079a
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author van Baalen, Carolina
Uspal, William E.
Popescu, Mihail N.
Isa, Lucio
author_facet van Baalen, Carolina
Uspal, William E.
Popescu, Mihail N.
Isa, Lucio
author_sort van Baalen, Carolina
collection PubMed
description 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 H(2)O(2) 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.
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spelling pubmed-106639882023-10-27 Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface van Baalen, Carolina Uspal, William E. Popescu, Mihail N. Isa, Lucio Soft Matter Chemistry 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 H(2)O(2) 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. The Royal Society of Chemistry 2023-10-27 /pmc/articles/PMC10663988/ /pubmed/37946586 http://dx.doi.org/10.1039/d3sm01079a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
van Baalen, Carolina
Uspal, William E.
Popescu, Mihail N.
Isa, Lucio
Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title_full Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title_fullStr Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title_full_unstemmed Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title_short Transition from scattering to orbiting upon increasing the fuel concentration for an active Janus colloid moving at an obstacle–decorated interface
title_sort transition from scattering to orbiting upon increasing the fuel concentration for an active janus colloid moving at an obstacle–decorated interface
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10663988/
https://www.ncbi.nlm.nih.gov/pubmed/37946586
http://dx.doi.org/10.1039/d3sm01079a
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