Publication: Nonequilibrium Casimir-like Forces in Liquid Mixtures
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2015-07-14
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American Physical Society
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Abstract
In this Letter, we consider a liquid mixture confined between two thermally conducting walls subjected to a stationary temperature gradient. While in a one-component liquid nonequilibrium fluctuation forces appear inside the liquid layer, nonequilibrium fluctuations in a mixture induce a Casimir-like force on the walls. The physical reason is that the temperature gradient induces large concentration fluctuations through the Soret effect. Unlike temperature fluctuations, nonequilibrium concentration fluctuations are also present near a perfectly thermally conducting wall. The magnitude of the fluctuation-induced Casimir force is proportional to the square of the Soret coefficient and is related to the concentration dependence of the heat and volume of mixing.
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© 2015 American Physical Society. The authors acknowledge valuable discussions with Jeremy N. Munday. The research at the University of Maryland was supported by the U.S. National Science Foundation under Grant No. DMR-1401449.
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