Low Temperature Physics: 35, 294 (2009); https://doi.org/10.1063/1.3115812 (5 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 4 (April 2009), p. 385-390    ( to contents , go back )

Evidence for high saturation of porous amorphous carbon films by noble gases

N.V. Krainyukova

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: krainyukova@ilt.kharkov.ua

Received January 26, 2009

Abstract

Results of the electron diffraction study of Kr and Xe deposits on amorphous porous carbon substrates are reported. We have observed mixtures of crystallites typical of condensates formed at such substrates at low deposition temperatures. However, in the warming process at temperatures about three-to-five degrees below the sublimation point characteristic of flat substrates, the diffraction patterns demonstrate that large crystallites gradually disappear and a highly disordered matter forms. Such transformed samples are kept inside substrates several dozens degrees above the sublimation points which are typical of these substances at flat (e.g. metallic) substrates.We ascribe these features to specificity of composites formed from noble gases strongly bonded inside porous carbon matrices due to capillary filling at temperatures close to the sublimation points.

PACS: 61.14.–x Electron diffraction and scattering;
PACS: 61.46.–w Nanoscale materials;
PACS: 81.05.Rm Porous materials; granular materials;
PACS: 81.05.Uw Carbon, diamond, graphite.

Key words: 7carbon nanopores, inert gases, absorption, electron diffraction.

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