Volume 82, Number 5, June 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||23 May 2008|
Evidence for a disorder-driven phase transition in the condensation of in aerogels
Institut Néel, CNRS-UJF - BP 166, 38042 Grenoble-Cedex 9, France, EU
2 Groupe d'Etude des Semiconducteurs, CNRS-UMR 5650, Université Montpellier II - Case Courrier 074, 34095 Montpellier-Cedex 5, France, EU
Corresponding author: email@example.com
Accepted: 14 May 2008
We report on thermodynamic and optical measurements of the condensation process of 4He in three silica aerogels of different microstructures. For the two base-catalysed aerogels, the temperature dependence of the shape of adsorption isotherms and of the morphology of the condensation process show evidence of a disorder-driven transition, in agreement with recent theoretical predictions. This transition is not observed for a neutral-catalysed aerogel, which we interpret as due to a larger disorder in this case.
PACS: 64.60.-i – General studies of phase transitions / 64.70.F- – Liquid-vapour transitions / 67.25.bh – Quantum fluids and solids: 4He: Films and restricted geometries
© EPLA, 2008
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