(716c) Sub-200-Nm Thick Carbon Molecular Sieve Membranes and Modulation of Pore-Size-Distribution By Room Temperature Oxygen Functionalization
In this presentation, I will discuss two membrane fabrication routes, namely transfer and masking techniques,4 leading to 100 â 200 nm CMS film by preventing the infiltration of the CMS precursor in the pores of the membrane support. The 100-nm-thick CMS film yielded attractive gas-sieving performances with H2 permeance reaching up to 3060 gas permeation units (GPU) with corresponding H2/CH4 selectivity of 18 at 150 oC.Furthermore, a rapid (of the order of 15 sec) and highly-tunable post-synthetic modification method based on room temperature ozone treatment will be discussed. Gas selectivity could be improved by several folds by shrinking the CMS micropores by a fraction of an angstrom. The optimized membranes yielded H2 permeance of 507 GPU and H2/CH4 selectivity of 50.7. Other membrane yielded H2 permeance of 453 GPU and H2/CH4 selectivity of 106.
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