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
formisano@fi.infn.it

Received 20 May 1999

Abstract
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.

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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