Interaction between Graphene Oxide and Pluronic F127 at the Air鈥揥ater Interface

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• 作者：Shanghao Li ; Jingru Guo ; Ravi A. Patel ; Anup L. Dadlani ; Roger M. Leblanc
• 刊名：Langmuir
• 出版年：2013
• 出版时间：May 14, 2013
• 年：2013
• 卷：29
• 期：19
• 页码：5742-5748
• 全文大小：389K
• 年卷期：v.29,no.19(May 14, 2013)
• ISSN：1520-5827

文摘

Triblock copolymer Pluronic F127 (PF127) has previously been demonstrated to disperse graphene oxide (GO) in electrolyte solution and block the hydrophobic interaction between GO and l-tryptophan and l-tyrosine. However, the nature of this interaction between PF127 and GO remains to be characterized and elucidated. In the present study, we aimed to characterize and understand the interaction between GO and PF127 using a 2-dimensional Langmuir monolayer methodology at the air鈥搘ater interface by surface pressure鈥揳rea isotherm measurement, stability, adsorption, and atomic force microscopy (AFM) imaging. Based on the observation of surface pressure鈥揳rea isotherms, adsorption, and stability of PF127 and PF127/GO mixture at the air鈥搘ater interface, GO is suggested to change the conformation of PF127 at the air鈥搘ater interface and also drag PF127 from the interface to the bulk subphase. Atomic force microscopy (AFM) image supports this assumption, as GO and PF127 can be observed by spreading the subphase solution outside the compressing barriers, as shown in the TOC graphic.