| Autor: | M. Schindler, Frank Pobell, Y. Kondo |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Journal of Low Temperature Physics. 110:549-554 |
| ISSN: | 0022-2291 |
| Popis: | The dynamics of adsorbed hydrogen molecules on the pore surface of Vycor glass has been investigated with a torsional oscillator technique at temperatures between 7.5 K and 22 K. Whereas most experiments carried out previously on this system were performed under thermodynamic equilibrium, we concentrated on the dynamics of the mass transport. Since the free energy of hydrogen inside the Vycor is a function of both temperature and film thickness, a temperature change causes a gradient in the chemical potential between inside and outside of the Vycor which leads to mass transport of the hydrogen molecules as consequence of a wetting or a solidification transition. We find a thermally activated motion with an activation energy of 25 K corresponding to the value for surface self-diffusion of quench-condensed hydrogen films. |
| Databáze: | OpenAIRE |
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