PEG polymer brushes via the Langmuir-Schaefer technique: The transfer ratio

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• 作者：Nicolas Brouette ; Michele Sferrazza ; ^{msferraz@ulb.ac.be}
• 关键词：Polymer brushes ; Langmuir&ndash ; Schaefer deposition ; Transfer ratio
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：643-645
• 全文大小：159 K

文摘

The Langmuir-Schaefer technique allows horizontal transfer of monolayer films of amphiphilic molecules from an air-water interface to a hydrophobic solid substrate. Spectroscopic ellipsometry has been used to estimate the transfer ratio of Polyethylene Glycol (PEG) polymer brushes prepared by this Langmuir-Schaefer method. We measured the transfer ratio for various degrees of polymerization and surface densities at the air-water interface. We do not observe a significant change of transfer ratio with the degree of polymerization. We also show that the transfer ratio is lower from an air-water monolayer film in the liquid phase than from a monolayer in the solid phase. Control over the transfer ratio is a crucial step in many experiments since the efficacy of the repression of proteins depends strongly on the assumption of the characteristics of the brushes.