在压力诱导下将液体酒精插入到石墨氧化物结构中
Alexandr V Talyzin1, Bertil Sundqvist, Tamás Szabó
1Department of Physics, Umeå University, SE-901 87 Umeå, Sweden. Alexandr.talyzin@physics.umu.se
Journal of the American Chemical Society
|December 2, 2009
概括
在压力下,石墨氧化物在浸入甲醇或乙醇时会经历显著的体积膨胀. 这种由溶剂插入引起的结构变化,在环境条件下可以保持.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 固态物理 固态物理
背景情况:
- 石墨氧化物 (GO) 是一种有层次的材料,在各种领域都有潜在的应用.
- 了解GO在压力下的行为对于其技术发展至关重要.
- 之前的研究探讨了GO与压力下水的相互作用.
研究的目的:
- 为了研究高压下在酒精介质中的石墨氧化物相变.
- 描述GO/酒精系统的结构变化和压力依赖的行为.
- 为了比较GO中的溶剂插入机制与不同的液体.
主要方法:
- 使用钻石天细胞进行高压实验.
- 用X射线衍射分析结构变化.
- 在多余的甲醇,乙醇和水/甲醇混合物中压缩GO.
主要成果:
- 在甲醇和乙醇中,石墨氧化物在0.2-0.8 GPa时经历~40%的单元细胞体积扩张.
- 这种扩张归因于压力诱导的溶剂插入到GO层间空间.
- 可将GO/乙醇的扩展高压相灭到环境压力.
- 在水/甲醇混合物中压缩的GO中观察到一个两步异常,表明顺序插入溶剂.
结论:
- 压力诱导的GO在酒精中的相变异与它在水中的行为不同.
- 溶剂插入GO间层是推动压力下的结构变化的关键机制.
- 灭扩展阶段的能力为创建基于GO的新型材料提供了可能性.
相关概念视频
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