Critical fluctuations of a binary fluid mixture confined in a porous medium |
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Authors: | F Formisano J Teixeira |
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Institution: | (1) Laboratoire Léon Brillouin, CEA/CNRS, 91191 Gif-sur-Yvette Cedex, France, FR;(2) Istituto Nazionale di Fisica della Materia Sezione di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy, IT |
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Abstract: | We have performed small angle neutron scattering experiments on the binary fluid mixture n-C6H14+n-C8F18 imbibed inside porous Vycor glass in the thermodynamic region corresponding to the bulk critical one. The resulting structure
can be represented as the sum of a temperature dependent Lorentzian term and a term describing the interference between the
porous matrix, a shell part richer in one component coating the glass surface, and a core part richer in the other component.
We observe critical fluctuations extending over distances markedly larger than the mean pore size.
Received 20 May 1999 |
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Keywords: | PACS 64 60 Cn Order-disorder transformations statistical mechanics of model systems - 64 70 Ja Liquid-liquid transitions - 68 45 Gd Wetting |
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