Author(s): W Taweepreda, R Nu-Mard, W Pattanasiriwisawa and P SongsiriritthigulAffiliation(s): Membrane Science and Technology Research Center, Polymer Science Program, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla, 90112, Thailand; NANOTEC Center of Excellence at Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand; Synchrotron Light Research Institute, 111 University Avenue, Muang, Nakhon Ratchasima 30000, Thailand; School of Physics, Suranaree University of Technology, Muang, Nakhon Ratchasima, 30000, Thailand
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