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
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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
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
