Capture of Superfluid Helium by Porous Structures

We have studied superfluid helium capture in a sample of silica aerogel of 98.2% porosity in the temperature range from 1.22 K up to 1.89 K. The high retention of He in the aerogel sample corresponds to a similar phenomenon in impurity-helium condensates, in which very high values of the ratio of he...

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Veröffentlicht in:Journal of low temperature physics 2008-02, Vol.150 (3-4), p.511-515
Hauptverfasser: Boltnev, R. E., Bykhalo, I. B., Ivashin, S. V., Krushinskaya, I. N., Mezhov-Deglin, L. P.
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container_issue 3-4
container_start_page 511
container_title Journal of low temperature physics
container_volume 150
creator Boltnev, R. E.
Bykhalo, I. B.
Ivashin, S. V.
Krushinskaya, I. N.
Mezhov-Deglin, L. P.
description We have studied superfluid helium capture in a sample of silica aerogel of 98.2% porosity in the temperature range from 1.22 K up to 1.89 K. The high retention of He in the aerogel sample corresponds to a similar phenomenon in impurity-helium condensates, in which very high values of the ratio of helium atoms to impurity atoms (up to 60) have been seen. We have observed that removing the aerogel sample from superfluid helium in a cylindrical glass beaker caused a decrease of the helium level corresponding to the geometrical volume of the sample (≈1 cm 3 ). This observation has allowed us to conclude that superfluid helium is completely captured by the porous sample. Superfluid helium filling aerogel and impurity-helium samples (porous structures) serves as a dispersive medium of gel-like samples which interacts strongly with impurity nanoclusters forming the dispersing system.
doi_str_mv 10.1007/s10909-007-9575-7
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subjects Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
title Capture of Superfluid Helium by Porous Structures
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