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    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/122540

    題名: Facile formation of symmetric microporous PVDF membranes via vapor-induced phase separation of metastable dopes
    作者: Su, Jenn Fang;Beltsios, Konstantinos G.;Li, Ping-Hong;Cheng, Liao-Ping
    關鍵詞: Membranes;PVDF;Bi-continuous structure;Vapor induced phase separation;Membrane distillation
    日期: 2022-02-05
    上傳時間: 2022-03-12 12:11:18 (UTC+8)
    出版者: Elsevier
    摘要: Symmetric microporous PVDF membranes were prepared from the ternary system water/triethyl phosphate/PVDF, by a vapor induced phase separation scheme (VIPS) that employed a non-solvent additive (i.e. water) in the dope to facilitate phase inversion. Incorporation of water into the dope generates a metastable system and induces precipitation even upon limited vapor-exposure at ambient conditions. Additionally, the resulted membranes exhibit a special bi-continuous bulk structure comprising interlinked crystallites with three-dimensionally porous networks. Moreover, the structure of top surface can be controlled by the duration of vapor exposure and ranges from a dense (nonporous) skin to an open top over the period of 0–8 min. Optimally, a symmetric microporous membrane with high hydrophobicity (CA = 119°), large porosity (84.5%) and submicron pore size (0.36 µm) appropriate for membrane distillation in desalination applications is obtained. In actual practice, this membrane could yield nearly pure water at the rate of 17.2 LMH from a 3.5% NaCl(aq) feed by direct contact membrane distillation operated at a temperature difference (ΔThot-cold) of 30 °C.
    關聯: Colloids and Surfaces A: Physicochemical and Engineering Aspects 634, 128012
    DOI: 10.1016/j.colsurfa.2021.128012
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文


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