Water and Gas Flow Measurements

1304 Words Feb 24th, 2018 5 Pages
The measurement of water flow indicated that the values exceeded those predicted by hydrodynamics models by several orders of magnitude. The water flow rates were similar to those predicted from molecular dynamics (MD) simulations. The measurement of gas flow revealed that the predictions given by the Knudsen Diffusion model, commonly employed for systems in which the pore diameter ranges in between 2 and 50 nm, were off by more than an order of magnitude. The study also showed that these nanotubes had greater permeability of gas and water as compared to commercial polycarbonate membranes, which are generally used for filtration, despite having pore sizes that were smaller in size. This study is interesting because it provides for an in depth study of mass transfer and filtration at a nanometer level in a confined space.
The study is of significant importance as it might give insight into “water transport through hydrophobic channels” which is similar to the “system of transmembrane protein pores like aquaporins”.
The paper reports that a double walled carbon nanotube (DWNT) was fabricated for the purposes of conducting transport experiments. These DWNTs were fabricated by a microelectromechanical systems (MEMS)-compatible process. First a vertical array of DWNTs were grown on a silicon chip used as a substrate by a catalytic chemical vapour deposition…
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