分子动力学的洞察力,以了解结构修饰的水在水性深层水溶剂 (ADES) 中的动态行为
Arnab Sil1, Sangeeta1, Vishnu Poonia1
1Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence, Delhi-NCR, Uttar Pradesh 201314, India.
The Journal of chemical physics
|October 22, 2024
概括
含有深层欧性溶剂 (DES) 的水表现出比纯水中的微观动态慢. 在水性DES中用离子取代离子加快了这些动态,揭示了依赖阴离子的结构刚性.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 计算化学计算化学
背景情况:
- 水显著改变了深层性溶剂 (DES) 的动力学,结构和特性.
- 虽然结构变化已被理解,但水中的水的微观动力学在水性DES (ADES) 中仍未得到充分研究.
研究的目的:
- 研究以乙胺基DES (NaSCN/KSCN) 的水性混合物中的水的微观结构和动力学.
- 了解类型 (Na+与K+) 对ADES中的水动态的影响.
主要方法:
- 分子动力学模拟30% (v/v) 的CH3CONH2和NaSCN/KSCN在不同盐分的水混合物.
- 分析水扩散系数,自我动态结构因子,重定位,键动态和居住时间相关函数.
主要成果:
- 在ADES中的水分子经历了一种异质的环境,受到子的影响.
- 在ADES中的水扩散系数低于纯水或缩盐溶液.
- 将Na+替换为K+会增加水的扩散并加速动态过程,这与NMR数据一致.
结论:
- 富含Na+的ADES表现出硬的水环境,原因是有阴离子和几何限制的水.
- 增加的KSCN分数导致较不刚性介质和更快的动态过程,这是由于较弱的K + - 水相互作用造成的.
- 阴子标识对水的微观动力学和结构刚性进行了批判性调节,在水性深层环氧溶剂中.
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