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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 24 — Aug. 20, 2001
  • pp: 4140–4145

Capillary-to-Bulk Crossover of Nonequilibrium Fluctuations in the Free Diffusion of a Near-Critical Binary Liquid Mixture

Pietro Cicuta, Alberto Vailati, and Marzio Giglio  »View Author Affiliations


Applied Optics, Vol. 40, Issue 24, pp. 4140-4145 (2001)
http://dx.doi.org/10.1364/AO.40.004140


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Abstract

We have studied the nonequilibrium fluctuations that occur 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 that are due to capillary waves and to bulk fluctuations. A linearized hydrodynamic 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 crossover of the contribution from the capillary waves to the bulk fluctuations.

© 2001 Optical Society of America

OCIS Codes
(240.6690) Optics at surfaces : Surface waves
(240.6700) Optics at surfaces : Surfaces
(290.5870) Scattering : Scattering, Rayleigh

Citation
Pietro Cicuta, Alberto Vailati, and Marzio Giglio, "Capillary-to-Bulk Crossover of Nonequilibrium Fluctuations in the Free Diffusion of a Near-Critical Binary Liquid Mixture," Appl. Opt. 40, 4140-4145 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-24-4140

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