解读图氧化物膜在湿度诱导的胀期间的拓和表面电荷之间的相互作用
Mohd Rafie Bin Shaharudin1, Christopher D Williams2, Amritroop Achari1,3
1Department of Chemical Engineering, School of Engineering, The University of Manchester, Booth Street East, M13 9PL Manchester, United Kingdom.
ACS nano
|November 2, 2023
概括
石墨烯氧化物 (GO) 膜胀是由片表面电荷和孔隙变化与增加的湿度驱动的. 模拟显示了GO膜的复杂,依赖湿度的结构和化学变化.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 表面化学 表面化学
背景情况:
- 石墨烯氧化物 (GO) 膜表现出由石墨烯氧化和制备影响的复杂形态.
- 了解GO膜胀对于分离和过的应用至关重要.
研究的目的:
- 在不同相对湿度 (RH) 条件下研究GO膜的膨胀机制.
- 为了阐明石墨烯表面化学和膜胀行为之间的关系.
- 为实验GO膜结构提供原子解析的洞察力.
主要方法:
- 大法典蒙特卡罗 (GCMC) 模拟被用于模拟GO膜胀.
- 在不同相对湿度水平下进行模拟.
- 模拟数据与实验吸附数据的比较.
主要成果:
- 在水吸附时,GO膜结构发生变化,氧化石墨烯片获得电荷.
- 碎片表面电荷驱动低RH的水吸附,有无序的毛孔.
- 在高的RH (80%),毛孔扩大,同时保持混乱;在非常高的RH (98%),毛孔变得状,片电荷稳定.
结论:
- GO膜胀是一个复杂的过程,受湿度依赖的表面电荷和毛孔形态的影响.
- 单个分子模型无法完全捕捉膨胀GO膜的动态化学和形态.
- 计算方法为GO膜结构提供了前所未有的原子解析的洞察力.
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