Artículo
Active spheres induce Marangoni flows that drive collective dynamics
Autor/es | Wittmann, Martin
Popescu, Mihail N. Domínguez Álvarez, Álvaro Simmchen, Juliane |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2021 |
Fecha de depósito | 2022-06-30 |
Publicado en |
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Resumen | For monolayers of chemically active particles at a fluid interface, collective dynamics is predicted to arise owing to activity-induced Marangoni flow even if the particles are not self-propelled. Here, we test this ... For monolayers of chemically active particles at a fluid interface, collective dynamics is predicted to arise owing to activity-induced Marangoni flow even if the particles are not self-propelled. Here, we test this prediction by employing a monolayer of spherically symmetric active TiO2 particles located at an oil–water interface with or without addition of a nonionic surfactant. Due to the spherical symmetry, an individual particle does not self-propel. However, the gradients produced by the photochemical fuel degradation give rise to long-ranged Marangoni flows. For the case in which surfactant is added to the system, we indeed observe the emergence of collective motion, with dynamics dependent on the particle coverage of the monolayer. The experimental observations are discussed within the framework of a simple theoretical mean-field model. |
Agencias financiadoras | Gobierno de España European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Identificador del proyecto | FIS2017-87117-P |
Cita | Wittmann, M., Popescu, M.N., Domínguez Álvarez, Á. y Simmchen, J. (2021). Active spheres induce Marangoni flows that drive collective dynamics. The European Physical Journal E, 44 (2), 15. |
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