Spontaneous propulsion of an isotropic colloid in a phase-separating environment
| Autor: | Jeanne Decayeux, Vincent Dahirel, Marie Jardat, Pierre Illien |
|---|---|
| Přispěvatelé: | PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
[PHYS]Physics [physics]
Phase transition endocrine system Materials science Statistical Mechanics (cond-mat.stat-mech) Isotropy digestive oral and skin physiology FOS: Physical sciences Condensed Matter - Soft Condensed Matter 01 natural sciences complex mixtures 010305 fluids & plasmas Langevin equation body regions Condensed Matter::Soft Condensed Matter Colloid Chemical physics Local symmetry Phase (matter) 0103 physical sciences Soft Condensed Matter (cond-mat.soft) Diffusion (business) 010306 general physics Anisotropy Condensed Matter - Statistical Mechanics |
| Zdroj: | Physical Review E Physical Review E, American Physical Society (APS), 2021, 104 (034602) |
| ISSN: | 2470-0045 2470-0053 |
| Popis: | International audience; The motion of active colloids is generally achieved through their anisotropy, as exemplified by Janus colloids. Recently, there was a growing interest in the propulsion of isotropic colloids, which requires some local symmetry breaking. Although several mechanisms for such propulsion were proposed, little is known about the role played by the interactions within the environment of the colloid, which can have a dramatic effect on its propulsion. Here, we propose a minimal model of an isotropic colloid in a bath of solute particles that interact with each other. These interactions lead to a spontaneous phase transition close to the colloid, to directed motion of the colloid over very long timescales and to significantly enhanced diffusion, in spite of the crowding induced by solute particles. We determine the range of parameters where this effect is observable in the model, and we propose an effective Langevin equation that accounts for it and allows one to determine the different contributions at stake in self-propulsion and enhanced diffusion. |
| Databáze: | OpenAIRE |
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