Graphene oxide at oil-water interfaces: Adsorption, assembly & demulsification
Graphene oxide at oil-water interfaces: Adsorption, assembly & demulsification
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DOI：
10.1016/j.colsurfa.2016.09.058
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发表时间：
2016-12-20
影响因子：
5.2
通讯作者：
Duan, Ming
中科院分区：
文献类型：
--
作者：
Fang, Shenwen;Chen, Ting;Duan, Ming
氧化石墨烯（GO）由于其独特的性质在科学界引起了广泛的兴趣。了解GO在油-水界面上的吸附行为在基础科学和GO在乳状液中的应用方面都变得越来越重要。在目前的工作中，在甲苯/水界面的吸附动力学的GO片探索通过使用垂滴张力计跟踪油/水界面张力的演变。在界面老化过程中观察到从扩散控制到动力学控制的转变，表明GO在界面上的不可逆吸附。讨论了表面活性剂存在下GO在油/水界面的组装。在十六烷基三甲基溴化铵和辛烷酚聚氧乙烯-10存在下，利用GO在油/水界面的组装可以制备坚固的大面积膜。讨论了相应的相互作用机理。最后，结合GO片的界面吸附和界面组装行为，揭示了GO对不同乳状液的破乳性能。本研究中的发现对于充分理解GO在乳液中的界面活性至关重要，并可能提供一种制备大面积氧化石墨烯薄膜的简便方法。(C)2016爱思唯尔B. V.保留所有权利。
Graphene oxide (GO) has gathered widespread interest within the scientific community due to its unique properties. Understanding the adsorption behaviors of GO at the oil-water interface has become increasingly important both in terms of fundamental science and applications of GO in emulsions. In the present work, the adsorption dynamics of GO sheets at the toluene/water interface were explored by using pendant drop tensiometry to trace the evolution of oil/water interfacial tensions. A shift from diffusion-controlled to kinetic controlled feature was observed during the aging of the interface, indicating the irreversible adsorption of GO to the interface. Assembly of GO at oil/water interfaces in the presence of surfactants were discussed. Robust large-area films could be prepared by taking advantage of the assembly of GO at the oil/water interface in the presence of cetyltrimethylammonium bromide and octane phenol polyoxyethylene-10. Corresponding interaction mechanisms were discussed. Ultimately, the acquired insights on the interfacial adsorption and the interfacial assembly behavior of GO sheets were combined to reveal the demulsification performance of GO for different emulsions. The findings in the present study are crucial for fully understanding the interfacial activity of GO in emulsions and might provide a facile way to prepare large-area graphene oxide thin films. (C) 2016 Elsevier B.V. All rights reserved.