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Microscopic Engine Powered by Critical Demixing

Journal article
Authors Falko Schmidt
Alessandro Magazzu
A. Callegari
L. Biancofiore
F. Cichos
Giovanni Volpe
Published in Physical Review Letters
Volume 120
Issue 6
ISSN 0031-9007
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevLett.120....
https://gup.ub.gu.se/file/207376
https://gup.ub.gu.se/file/207381
Keywords particles, transitions, Physics
Subject categories Physical Sciences

Abstract

We experimentally demonstrate a microscopic engine powered by the local reversible demixing of a critical mixture. We show that, when an absorbing microsphere is optically trapped by a focused laser beam in a subcritical mixture, it is set into rotation around the optical axis of the beam because of the emergence of diffusiophoretic propulsion. This behavior can be controlled by adjusting the optical power, the temperature, and the criticality of the mixture.

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