Synthesis of Nanoporous Silica Membrane and Their Gas Transport Mechanism

TL;DRAbstract

A fundamental understanding of the processes affecting fluid transport in the voids of porous materials constitutes a key step in numerous emerging applications in nanotechnology, materials design, membrane science and biology. By a purely hard sphere treatment of the diffusant, for over a century the Knudsen-based method has been the primary technique in our craft for investigating the transport of fluids in confined space, particularly in narrow disordered nanoporous adsorbents, catalysts and membranes. However, recent theoretical results and simulations, as well as experimental data on transport in well characterised narrow nanoporous materials indicate that the apparent success of the correlation is not necessarily a vindication of the Knudsen theory. Instead, these simulations, and the unrealistically high tortuosities obtained on application of the correlation, demonstrate the Knudsen model to substantially overestimate the diffusivity due to significant dispersive fluid-solid in

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