Engineering the morphology of carbon molecular sieve (CMS) hollow fiber membranes
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Carbon Molecular Sieve (CMS) membranes have a potential to achieve attractive gas separation properties. CMS membranes in dense film configuration have shown promising results. Hence, for industrial application it’s important to translate this high performance in hollow fiber configuration. The key shortcoming in CMS hollow fiber fabrication has been the collapse of porous support resulting in lower gas separation productivities. Therefore, the goal of this study was to prevent the collapse in CMS hollow fibers by a process called as V-Treatment. The V-Treatment process uses the sol-gel reaction mechanism between organic-alkoxy silane (i.e. Vinyltrimethoxy Silane – VTMS) and moisture. The sol-gel reaction proposed in this study is a first-of-a-kind approach in asymmetric CMS membranes to create porous morphologies, and it can be easily integrated into the current asymmetric CMS membrane fabrication process. The V-treatment technique enables restricting the microscale morphology collapse in asymmetric CMS membranes without having a chemical reaction with the polymer precursor material.