Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States.
Langmuir. 2013 May 14;29(19):5742-8. doi: 10.1021/la401056t. Epub 2013 May 2.
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-water interface by surface pressure-area isotherm measurement, stability, adsorption, and atomic force microscopy (AFM) imaging. Based on the observation of surface pressure-area isotherms, adsorption, and stability of PF127 and PF127/GO mixture at the air-water interface, GO is suggested to change the conformation of PF127 at the air-water 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.
三嵌段共聚物 Pluronic F127（PF127）先前已被证明可在电解质溶液中分散氧化石墨烯（GO），并阻止 GO 与 l-色氨酸和 l-酪氨酸之间的疏水相互作用。然而，PF127 和 GO 之间的这种相互作用的性质仍有待表征和阐明。在本研究中，我们旨在使用二维 Langmuir 单层方法，通过表面压-面积等温线测量、稳定性、吸附和原子力显微镜（AFM）成像，来表征和理解 GO 和 PF127 之间的相互作用。基于在空气-水界面上观察到的表面压-面积等温线、PF127 和 PF127/GO 混合物的吸附和稳定性，GO 被认为会改变 PF127 在空气-水界面上的构象，并且还会将 PF127 从界面拖曳到主体亚相中。原子力显微镜（AFM）图像支持了这一假设，因为可以通过将亚相溶液铺展在压缩障碍之外来观察 GO 和 PF127，如图所示。
