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Increase of flow-through pores in rationally designed organosilica-PVDF nanocomposite membrane

机译:合理设计的有机硅-PVDF纳米复合膜中的流通孔隙增加

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Organosilica-polyvinylidenefluoride nanocomposite membrane has shown excellent performance in emerging technology of membrane distillation process for treatment of highly saline water stream. In present work, a systematic study using capillary flow porometry was carried out to evaluate the constricted part of the flow-through pores, which is active pores of the nanocomposite membranes. Mean flow pore size and distributions of the membrane pores were found to be influenced due to the phenomenon of micro-gelation by air exposure prior to the immersion in the coagulation bath of the preparation method, polymer concentration, polymer chain length and nature of the solvent in the casting dope solution. The best membrane in terms of the largest mean flow diameter of 0.12 mu m with narrow distribution of flow-through pores were observed in the membrane with optimum organosilica content of 1.4 wt%.
机译:有机硅-聚偏氟乙烯纳米复合膜在处理高盐水流的新兴膜蒸馏技术中表现出了优异的性能。在目前的工作中,使用毛细管流动孔隙率测定法进行了系统的研究,以评估通孔的收缩部分,即纳米复合膜的活性孔。研究发现,由于制备方法、聚合物浓度、聚合物链长度和浇铸涂料溶液中溶剂的性质在浸入凝固浴之前暴露在空气中产生的微凝胶现象,膜孔的平均流动孔径和分布受到影响。在最佳有机二氧化硅含量为1.4 wt%的膜中,观察到最大平均流径为0.12μm、通孔分布窄的最佳膜。

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