Counterion Exchange to Achieve Reversibly Switchable Hydrophobicity and Oleophobicity on Fabrics

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• 作者：Jin Yang ; Zhaozhu Zhang ; Xuehu Men ; Xianghui Xu ; Xiaotao Zhu ; Xiaoyan Zhou
• 刊名：Langmuir
• 出版年：2011
• 出版时间：June 21, 2011
• 年：2011
• 卷：27
• 期：12
• 页码：7357-7360
• 全文大小：807K
• 年卷期：v.27,no.12(June 21, 2011)
• ISSN：1520-5827

文摘

We describe a simple layer-by-layer (LbL) technology and counterion exchange procedure to tune the liquid wettability of commercially available cotton fabrics. A polyelectrolyte multilayer is deposited on the fabric surface by the LbL technology, and counterion exchange is used to control the surface composition and thereby to modulate the solid surface energy. The tunability of the solid surface energy, along with the inherent re-entrant texture of the cotton fabric, results in simultaneously switchable wettability between a nonwetting state and a fully wetted state for water and hexadecane. This switchable hydrophobicity and oleophobicity can be explained within a robustness factor, which is a quantitative criterion for the transition between the two states. The counterion exchange can be confirmed by X-ray photoelectron spectroscopy analysis.