Capillary Condensation of Liquid 4He in Aerogel on Cooling Through λ Point

Miyashita, W.; Yoneyama, K.; Kato, Hitoshi; Nomura, R.; Okuda, Y.

doi:10.1063/1.2354687

Cited by 3 publications

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“…Silica-aerogels are highly porous materials whose pore size is on a nanometer scale while at the same time being very transparent; we can thus investigate the dynamics inside the material by visual observation. There have been several reports on the imbibition process of normal fluid and superfluid 4 He in aerogel by visualization [10][11][12]; superfluid 4 He is imbibed in aerogel at a constant rate while normal fluid 4 He is imbibed following the classical Washburn law. Anomalous two-step imbibition was also found in highly porous aerogels [11].…”

Section: Introductionmentioning

confidence: 99%

Formation of superfluid liquid pocket in aerogel and its solidification by cooling

Matsuda

Ochi

Isozaki

et al. 2013

Low Temperature Physics

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Formation of superfluid liquid pockets of 4 He surrounded by 4 He crystals were observed in an aerogel of 96% porosity. The liquid pockets did not crystallize by application of pressure but crystallized via avalanche by cooling below a particular temperature. The crystallization by cooling was also observed when crystals occupied a smaller portion of the aerogel. Driving force for the crystallization by cooling and possible mass transport process are discussed.

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Section: Introductionmentioning

confidence: 99%

Formation of superfluid liquid pocket in aerogel and its solidification by cooling

Matsuda

Ochi

Isozaki

et al. 2013

Low Temperature Physics

Self Cite

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Nucleation and Avalanche of 4He Crystals in Aerogel

et al. 2009

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Imbibition of Liquid Helium in Aerogels

et al. 2012

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6 pagesInternational audienceWe report optical measurements of the imbibition of liquid helium in a sample of silica aerogel with 90 % porosity. Both direct imaging and light scattering experiments were performed to determine the dynamics and the properties of the liquid-gas interface in both the normal and superfluid phases of liquid helium. In the normal phase, a classical Lucas Washburn behavior is observed for the rise of the imbibition front while the behavior in the superfluid phase is markedly different, as the fluid invades the sample from all sides with a constant speed. In both phases, the interface is rough, leading to light scattering. In addition, condensation ahead of the imbibition front is observed at low temperature in the superfluid phase

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Capillary Condensation of Liquid 4He in Aerogel on Cooling Through λ Point

Cited by 3 publications

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Formation of superfluid liquid pocket in aerogel and its solidification by cooling

Formation of superfluid liquid pocket in aerogel and its solidification by cooling

Nucleation and Avalanche of 4He Crystals in Aerogel

Imbibition of Liquid Helium in Aerogels

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