期刊
NANOTECHNOLOGY
卷 27, 期 8, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0957-4484/27/8/085707
关键词
anodic alumina membranes; track-etched membranes; nanopores; mass transport; Knudsen diffusion; transition flow; slip-flow
资金
- Rosneft Oil Company
- Russian Scientific Foundation [15-19-10002]
- RF President Grant [MK-5085.2015.3]
- Russian Foundation for Basic Research Grant [16-08-00574]
- Lomonosov Moscow State University Development Program
- Russian Science Foundation [15-19-10002] Funding Source: Russian Science Foundation
An experimental study on the permeability of anodic alumina (20-120 nm) and track-etched (30 nm) nanoporous membranes for different gases in the transitional flow regime is reported in the range of Knudsen numbers from 0.1 to 10. A significant variation (up to 30%) of the membrane permeance for different gases at the same Knudsen numbers is reported with certainty. It is established that this. discrepancy relates to a molecule's effective collision area, which is poorly described in the frameworks of conventional gas permeation models. Two models are proposed for the description of the effect: self-diffusion of penetrate gases due to intermolecular collisions and enhancement of the slip flow contribution due to tangential momentum accommodation growth with the decrease of a molecule's effective collision area. The best fit parameters for the simultaneous fit of the experimental data with different models for 30 membrane-gas pairs are given.
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