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    Interfacial Polymerization with Electrosprayed Microdroplets: Toward Controllable and Ultrathin Polyamide Membranes

    Year: 2018

    Journal: Environ. Sci. Technol. Lett., Volume 5, FEB, page 117–122

    Authors: Ma, Xiao-Hua; Yang, Zhe; Yao, Zhi-Kan; Guo, Hao; Xu, Zhen-Liang; Tang, Chuyang Y.

    Organizations: Hong Kong Scholars Program [XJ2015015]; Research Grants Council of Hong Kong [17207514]; Strategic Research Theme (Clean Energy) at the University of Hong Kong; National Natural Science Foundation of China [21406060]; Fundamental Research Funds for the Central Universities [WA1514305]; China Postdoctoral Science Foundation [2016M601527]

    Commercial polyamide membranes for seawater desalination and water purification have low water permeability because of their relatively thick rejection layers. We report a novel interfacial polymerization method for synthesizing ultrathin polyamide layers with a precisely controllable thickness. Monomer solutions of m-phenylenediamine and trimesoyl chloride were electrosprayed into fine microdroplets. The polymerization reaction between microdroplets of different monomers leads to a fine and controllable amount of deposition. We fabricated smooth polyamide layers from 4 nm to several tens of nanometers in thickness, with a growth rate of approximately 1 nm/min. Our study provides a new dimension for the rational design and preparation of ultrathin polyamide membranes with tunable separation properties.
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