Size-Dependent Interfacial Assembly of Graphene Oxide at Water-Oil Interfaces
Size-Dependent Interfacial Assembly of Graphene Oxide at Water-Oil Interfaces
复制标题
氧化石墨烯在水-油界面上的尺寸依赖性界面组装
DOI：
10.1021/acs.jpcb.0c02687
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发表时间：
2020
影响因子：
3.3
通讯作者：
Wang Dong
中科院分区：
文献类型：
--
作者：
Yuan Qingqing;Xue Han;Lv Jianyong;Wang Jianjun;Shi Shaowei;Russell Thomas P.;Wang Dong
使用悬滴张力测定法研究氧化石墨烯 (GO) 在水/油界面的界面组装与 pH、GO 尺寸和浓度以及聚合物配体分子量的函数关系。结果发现，GO片的横向尺寸越小，界面张力下降得越快，油水之间的界面张力越低。界面张力下降速率的差异与GO向界面的扩散、GO在界面处的呈现、相对于表面积的功能化程度以及GO的面内运动以适应更多GO到达界面以有效覆盖界面有关。在界面处形成的固体薄膜的模量随着GO横向尺寸的减小而增加。
The interfacial assembly of graphene oxide (GO) at the water/oil interface was investigated using pendant drop tensiometry as a function of the pH, GO size and concentration, and molecular weight of the polymer ligands. It was found that the smaller the lateral dimension of the GO sheets, the more rapidly the interfacial tension decreased, and the lower was the interfacial tension between the oil and water. The differences in the rates at which the interfacial tension decreased are related to the diffusion of the GO to the interface, the presentation of the GO at the interface, the degree of functionalization relative to the surface area, and the in-plane motion of the GO to accommodate the arrival of more GO at the interface to effectively cover the interface. The solidlike film formed at the interface had a modulus that increased with decreasing lateral GO dimensions.