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Entropy 2017, 19(2), 77;

Energy Transfer between Colloids via Critical Interactions

Laboratoire de Physique, École Normale Supérieure, CNRS UMR5672 46 Allée d’Italie, Lyon 69364, France
Departamento de Física Atómica, Molecular y Nuclear and Grupo Interdisciplinar de Sistemas Complejos, Universidad Complutense de Madrid, Madrid 28040, Spain
Scottish Universities Physics Alliance and School of Physics and Astronomy, The University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK
Authors to whom correspondence should be addressed.
Academic Editors: Giancarlo Franzese, Ivan Latella and Miguel Rubi
Received: 22 January 2017 / Revised: 12 February 2017 / Accepted: 14 February 2017 / Published: 17 February 2017
(This article belongs to the Special Issue Nonequilibrium Phenomena in Confined Systems)
Full-Text   |   PDF [530 KB, uploaded 17 February 2017]   |  


We report the observation of a temperature-controlled synchronization of two Brownian-particles in a binary mixture close to the critical point of the demixing transition. The two beads are trapped by two optical tweezers whose distance is periodically modulated. We notice that the motion synchronization of the two beads appears when the critical temperature is approached. In contrast, when the fluid is far from its critical temperature, the displacements of the two beads are uncorrelated. Small changes in temperature can radically change the global dynamics of the system. We show that the synchronisation is induced by the critical Casimir forces. Finally, we present the measure of the energy transfers inside the system produced by the critical interaction. View Full-Text
Keywords: critical Casimir force; synchronization; stochastic energetics; colloidal physics; binary mixtures critical Casimir force; synchronization; stochastic energetics; colloidal physics; binary mixtures

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Martínez, I.A.; Devailly, C.; Petrosyan, A.; Ciliberto, S. Energy Transfer between Colloids via Critical Interactions. Entropy 2017, 19, 77.

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