Capillary to bulk crossover of nonequilibrium fluctuations in the free diffusion of a near--critical binary liquid mixture

Details Capillary to bulk crossover of nonequilibrium fluctuations in the free diffusion of a near--critical binary liquid mixture Capillary to bulk crossover of nonequilibrium fluctuations in the free diffusion of a near--critical binary liquid mixture

2001-03-26

arxiv.org/abs/cond-mat/0103547v1

Physics

Condensed Matter

Statistical Mechanics

accepted for publication in Applied Optics

Scientific paper

10.1364/AO.40.004140

We have studied the nonequilibrium fluctuations occurring at the interface between two miscible phases of a near-critical binary mixture during a free diffusion process. The small-angle static scattered intensity is the superposition of nonequilibrium contributions due to capillary waves and to bulk fluctuations. A linearized hydrodynamics description of the fluctuations allows us to isolate the two contributions, and to determine an effective surface tension for the nonequilibrium interface. As the diffuse interface thickness increases, we observe the cross-over of the capillary-wave contribution to the bulk one.

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