Controllable Water Permeation on a Poly(N-isopropylacrylamide)-Modified Nanostructured Copper Mesh Film

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• 作者：Wenlong Song ; Fan Xia ; Yubai Bai ; Fengqi Liu ; Taolei Sun ; Lei Jiang
• 刊名：Langmuir
• 出版年：2007
• 出版时间：January 2, 2007
• 年：2007
• 卷：23
• 期：1
• 页码：327 - 331
• 全文大小：296K
• 年卷期：v.23,no.1(January 2, 2007)
• ISSN：1520-5827

文摘

Water permeation is important for various applications in industry, agriculture, and daily life. However, mostresearch mainly focuses on the static wettability on different surfaces, and the dynamic properties of the micro- andnanostructure-enhanced responsive wettability is lacking. And the relevant application research is rare, which stillremains a challenge. Herein we report the temperature-controllable water permeation on a poly(N-isopropylacrylamide)-modified nanostructured copper mesh film. At low temperatures (below 25 C), the film shows good water permeabilitybecause of the highly hydrophilic nature, and as a result, the water can easily penetrate through the film. At hightemperatures (above 40 C), it is impermeable to water because of the superhydrophobicity and the large negativecapillary effect induced by the micro- and nanostructures. The excellent controllability of water permeation on thisfilm may be convenient for use in many processes including filtration, water/oil separation, and so on. A detailedinvestigation indicates that the special nanostructures and the appropriate size of the microscale mesh pores not onlyinfluence the static contact angles of the mesh film, but also, more importantly, greatly improve the dynamic propertiesof wettability at different temperatures simultaneously, which plays a crucial role in the excellent controllability overwater permeation on this film. This work may also provide interesting insight into the design of novel functionaldevices that are relevant to surface wettability.