Vertically Oriented Microporous Membranes Prepared by Bidirectional Freezing
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Polystyrene membranes with precisely controlled and vertically oriented pores are fabricated by a bidirectional freezing process. In this process, the influence of polymer in growth of diphenyl sulfone (DPS) crystals has been demonstrated by XRD and simulated by DFT based on the interaction between DPS crystal faces and polystyrene (PS). The influence of temperature gradient on membrane structures is also elucidated. Compared to the original membrane and modified traditional membranes, modified PS membranes with vertically oriented pores show large and stable fluxes in the processes of multiple oil and water separation.
KeywordsSeparation membrane Vertical pores Bidirectional freezing Oil separation
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51522305 and 21374100) and the Fundamental Research Funds for the Central Universities (No. 2015XZZX004-26).
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