C213 垂直配向単層カーボンナノチューブ膜における気体分子のエネルギー適応過程の解析(マイクロ・ナノスケールの熱輸送現象III)

概要

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Scattering process of helium molecules on vertically aligned single-walled carbon nanotubes (VA-SWNTs) was investigated using the molecular beam technique. We found that the modification of quartz surface with VA-SWNT films significantly enhances the energy transfer between gas molecules and the surface at room temperature and makes the energy accommodation coefficient of helium, which tends to be small even for contaminated surfaces because of the large mass mismatch between helium and surface atom, close to unity. The high porosity of the film enables gas molecules to penetrate into the film and suffer multiple collisions with carbon nanotubes, leading to the efficient energy transfer.
2009-11-06