Localized Heat Generation from Magnetically Responsive Membranes

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• 作者：Xianghong Qian ; Qian Yang ; Anh Vu ; S. Ranil Wickramasinghe
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：55
• 期：33
• 页码：9015-9027
• 全文大小：676K
• 年卷期：0
• ISSN：1520-5045

文摘

Commercial thin film composite nanofiltration NF270 and microfiltration polyethylene terephthalate (PET) track-etched membranes were modified by grafting thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) polymers via surface initiated atom transfer radical polymerization (ATRP). The polymer chain ends were conjugated with superparamagnetic (Fe₃O₄) nanoparticles. Each tailored superparamagnetic nanoparticle acts as a nanoheater under an external oscillating magnetic field. The localized heat generated induces the lower critical solution temperature (LCST) transition for the PNIPAM in aqueous solution. The phase transition of the polymer leads to the alteration of membrane transport properties. Localized heating affects membrane permeability differently for NF270 and PET membranes based on whether the modification occurs on the membrane surfaces or inside the membrane pores. Filtration of polystyrene latex particles through PET membranes demonstrates that it is possible to modulate the pore size by applying an external oscillating magnetic field.