Abstract
Summary Previous attempts to characterize the gas transport through inorganic nanopores were not fully successful. The presence of adsorption water film within nanopores is generally overlooked. Moreover, the compound influences of moisture content and confinement effect on critical properties of gas phase have not been considered before. With the intent of overcoming these deficiencies, a fully-coupled analytical model has been developed, in which complex bulk-gas transport mechanisms, moisture content, confinement effect, as well as various cross-section shapes of nanopores are incorporated. Results show that confinement effect will significantly enhance the apparent gas permeability when the pore radius is smaller than 5 nm. And real gas effect can achieve an average increase of 4.38% when the pore radius falls in the range of 1∼2 nm. The stress dependence will greatly decrease the apparent gas permeability and the corresponding degree for slit-like inorganic nanopores will slightly increase with the increasing aspect ratio.
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