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Updated: Jul 15, 2025
In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
Published on: September 2, 2016
Anomalous Diffusion of Helium and Neon in Low-Density Silica Glass
Sergey V Kukhtetskiy1, Elena V Fomenko1, Alexander G Anshits1,2
1Federal Research Center "Krasnoyarsk Science Center SB RAS", Institute of Chemistry and Chemical Technology SB RAS, Akademgorodok 50/24, Krasnoyarsk 660036, Russia.
Abstract:
The diffusion properties of low-density non-porous silica glasses (expanded silica glasses) were researched with the aim of searching for the molecular structure of membrane materials intended for the effective separation of helium-neon gas mixtures. It has been shown on a large number (84) of computer models of such glasses that there are molecular structures of silica in which various helium and neon diffusion mechanisms are simultaneously implemented: superdiffusion for helium and subdiffusion for neon. This makes it possible to significantly (by 3-5 orders of magnitude) increase the helium permeability of such glasses at room temperature and maintain a high selectivity for the separation of helium and neon (at the level of 104-105) at the same time.
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