使用霍夫迈斯特离子在空气/水界面上的水蒸发过程的研究
Bhawna Rana1, David J Fairhurst2, Kailash C Jena1,3
1Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India.
Journal of the American Chemical Society
|September 22, 2022
概括
离子通过改变空气/水接口结构来改变水蒸发速度. 宇宙热带离子减缓了蒸发,而热带离子加速了蒸发,影响了结合和分子方向.
科学领域:
- 物理化学
- 表面科学
- 化学物理
背景情况:
- 蒸发是一个关键的界面过程,涉及水分子转化为蒸汽.
- 界面水结构在蒸发中的确切作用尚不完全理解.
- 了解这一过程对于包括大气科学和材料处理在内的各种应用至关重要.
研究的目的:
- 研究宇宙热带和热带离子对水蒸发速度的影响.
- 阐明控制离子对水界结构和蒸发的影响的分子层次机制.
- 将观察到的蒸发趋势与霍夫迈斯特系列相关联.
主要方法:
- 使用时间分辨率干涉度测量水盐滴的蒸发速度.
- 使用表面特定总频率生成 (SFG) 振动光谱来探测空气/水接口结构.
- 引入宇宙热 (例如,HPO4^2-,SO4^2-,CO3^2-) 和混热 (例如,NO3^-,I-) 离子来扰乱结网络.
主要成果:
- 发现宇宙热离子会降低蒸发率,而混乱热离子会增加蒸发率,这与霍夫迈斯特系列相一致.
- SFG光谱显示,离子显著改变结强度和界面上的自由OH振荡器的方向.
- 在结度,OH振荡器方向和观察到的蒸发率之间建立了相关性.
结论:
- 这项研究表明,通过修改水界结构, 离子对水蒸发有深远的影响.
- 强化结合,使OH振荡器远离表面正常,减缓蒸发.
- 混流体会削弱结合,并将OH振荡器定向向表面正常,加速蒸发,从而证实了界面水结构的决定性作用.
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