2020 Impact factor 1.890
Soft Matter and Biological Physics

Eur. Phys. J. E 1, 1-4

Rapid Note

Critical fluctuations of a binary fluid mixture confined in a porous medium

F. Formisano12 - J. Teixeira1

1 Laboratoire Léon Brillouin, CEA/CNRS, 91191 Gif-sur-Yvette Cedex, France
2 Istituto Nazionale di Fisica della Materia Sezione di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy

Received 20 May 1999

We have performed small angle neutron scattering experiments on the binary fluid mixture n-C6H14+n-C8F18imbibed 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.

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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