Chitosan-silane sol-gel hybrid thin films with controllable layer thickness and morphology

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• 作者：Stefan Spirk^a ; ^b ; ¹ ; ^{stefan.spirk@uni-graz.at} ; Gerald Findenig^a ; ¹ ; Ales Doliska^b ; ¹ ; Victoria E. Reichel^a ; ^b ; Nicole L. Swanson^a ; Rupert Kargl^a ; ¹ ; Volker Ribitsch^a ; ¹ ; Karin Stana-Kleinschek^b ; ¹
• 关键词：Hybrid materials ; Chitosan ; Sol&ndash ; gel process ; Thin films ; Silanes ; Sarfus
• 刊名：Carbohydrate Polymers
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：93
• 期：1
• 页码：285-290
• 全文大小：876 K

文摘

The preparation of thin films of chitosan-silane hybrid materials by combining sol-gel processing and spin coating is reported. A variety of silanes can be used as starting materials for the preparation of such thin films, namely tetraethoxysilane, tri-tert-butoxysilanol, trimethylethoxysilane, p-trifluoromethyltetra-fluorophenyltriethoxysilane, trivinylmethoxysilane, (methoxymethyl)trimethyl-silane, and hexamethoxydisilane. These silanes are subjected to a sol-gel process before they are added to acidic chitosan solutions. The chitosan:silane ratio is kept constant at 6:1 (w/w) and dilutions with ethanol are prepared and spin coated. Depending on the degree of dilution, film thickness can be controlled in a range between 5 and 70 nm. For the determination of additional surface properties, static water contact angle measurements and atomic force microscopy have been employed.