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DOI : 10.1209/0295-5075/101/16010

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Europhysics Letters 101 (2013) 16010

Light scattering reveals the influence of temperature on collective effects during evaporation and condensation in a disordered porous material

Fabien Bonnet 1, Mathieu Melich 1, Laurent Puech 1, Pierre-Etienne Wolf 1

(22/01/2013)

We combine high resolution isotherms measurements and light scattering technics to study over a broad temperature range collective effects during the condensation and evaporation of helium from Vycor, a prototypic disordered porous material. For evaporation, our results provide the first direct evidence for a crossover from a percolation collective mechanism at low temperature to a local cavitation mechanism at high temperature. No long range collective effects are detected during condensation. We compare these results to recent theoretical predictions emphasizing the specific role of disorder, and discuss their relevance for determining pores sizes distributions in disordered porous materials.

1 :	Institut Néel (NEEL)
	CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)

Équipe de recherche : HELFA

Domaine

:

Physique/Matière Condensée/Mécanique statistique Physique/Matière Condensée/Matière Molle

Mots Clés : Liquid Vapor transition – confinement – porous materials – disorder – percolation – cavitation – light scattering

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Contributeur : Pierre-Etienne Wolf <>

Soumis le : Vendredi 3 Août 2012, 23:20:00

Dernière modification le : Mercredi 17 Avril 2013, 22:08:45