在异性压力状态下NaCl的溶解性
Bilal Mahmoud Hawchar1,2,3, Tulio Honorio2, Matthieu Vandamme1
1Laboratoire Navier, Ecole des Ponts ParisTech, Université Gustave Eiffel, CNRS, Marne-la-Vallée, France.
The Journal of chemical physics
|July 17, 2023
概括
异型压力显著改变盐的溶解性,影响盐在多孔材料的风化. 这项研究使用分子模拟来量化这些效应,修改已有的规律以获得更高的准确性.
科学领域:
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
- 物理化学 物理化学
背景情况:
- 盐化是多孔介质中的一个关键过程,受到盐晶体的机械应力的影响.
- 现有的模型通常假定异型应力,这可能不反映孔内的现实世界条件.
研究的目的:
- 用分子模拟来确定化 (NaCl) 在异性压力条件下在水中的溶解度.
- 重构可溶性条件,以考虑化学潜力的张量性质在异型应力状态下.
主要方法:
- 使用哈密尔顿热力学集成计算自由能量的分子模拟.
- 在不同压力状态下计算溶液和晶体的化学潜力.
- 对于非理想的液相行为,Pitzer离子相互作用方法的应用.
主要成果:
- 不同向量的压力使得晶体的化学潜能取决于方向,需要张量热力学公式.
- 发现单轴压缩显著影响了NaCl的溶解度,因此需要修订科伦斯定律.
- 观察到结晶几乎与晶体表面直角发生,即使在高剪压下.
结论:
- 压力异构性在盐的溶解性和气候变化中起着至关重要的作用,与异构性条件有很大不同.
- 经过修订的科伦斯法为了解在异性压力下盐的行为提供了一个框架.
- 这项研究提供了一个更准确的热力学模型,用于限制环境中的盐结晶.
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