Asymmetric Free-Standing Film with Multifunctional Anti-Bacterial and Self-Cleaning Properties

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• 作者：Liyan Shen ; Bailiang Wang ; Jinlei Wang ; Jinhong Fu ; Catherine Picart ; Jian Ji
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：September 26, 2012
• 年：2012
• 卷：4
• 期：9
• 页码：4476-4483
• 全文大小：590K
• 年卷期：v.4,no.9(September 26, 2012)
• ISSN：1944-8252

文摘

A superhydrophobic/hydrophilic asymmetric free-standing film has been created using layer-by-layer assembly technique. Poly(ethylene-imine)-Ag⁺ complex (PEI-Ag⁺) at pH 9.0 was assembled with poly(acrylic acid) (PAA) at pH 3.2 on a Teflon substrate to yield a micronanostructured surface that can be turned to be superhydrophobic after being coated with a low surface energy compound. Silver nanoparticle loaded free-standing film with one surface being superhydrophobic while the other surface is hydrophilic was then obtained after detachment from the substrate. The superhydrophobicity enabled the upper surface with anti-adhesion and self-cleaning properties and the hydrophilic bottom surface can release silver ions as antibiotic agent. The broad-spectrum antimicrobial capability of silver ions released from the bottom surface coupled with superhydrophobic barrier protection of the upper surface may make the free-standing film a new therapy for open wound.

Keywords:

asymmetric; superhydrophobic; free-standing films; anti adhesion; drug release; layer-by-layer assembly