2005/06/30 by Tobias Herman, Herman, Tobias, John Beamish +1
Chemistry · Engineering · Physics and Astronomy · #Aerogels and thermal insulation #Heat Transfer and Boiling Studies #Quantum, superfluid, helium dynamics #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.cond-mat/0506815
12 pages, 14 figures, submitted to JLTP
arxiv created 2005/06/30 · arxiv updated 2009/12/01
Fluid phase transitions in porous media are a powerful probe of the effect of confinement and disorder on phase transitions. Aerogel may provide a model system in which to study the effect of dilute impurities on a variety of phase transitions. In this paper we present a series of low frequency acoustic experiments on the effect of aerogel on the liquid-vapor phase transition. Acoustic resonators were used to study the liquid-vapor transition in two fluids (helium and neon) and in two different porosity aerogels (95% and 98%). While effective coexistence curves could be mapped out, the transition was sometimes difficult to pinpoint, leading to doubt as to whether this transition can be treated as an equilibrium macroscopic phase transition at all.