从分子模拟中预测一种强溶性溶液的水溶性
James Carruthers1, Mauro Ferrario2, Jamshed Anwar1
1Department of Chemistry, Lancaster University, Lancaster LA1 4YB, United Kingdom.
The Journal of chemical physics
|July 28, 2023
概括
分子模拟使用化学潜能计算和直接共存模拟来预测尿素的水溶性. 这两种方法的结果都明显低于实验值,突出了准确建模溶解度的挑战.
科学领域:
- 计算化学计算化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 准确预测化合物溶解度对于各种应用至关重要.
- 分子模拟方法越来越多地用于可溶性预测.
- 尿素的水溶性是具有重要的实验数据的关键参数.
研究的目的:
- 用分子模拟来预测300K时尿素的水溶性.
- 为了比较化学潜力计算和直接共存模拟的结果.
- 评估两个不同的尿素模型组合 (Özpınar/TIP3P和Hölzl/TIP4P/2005) 的性能.
主要方法:
- 在水溶液中计算出尿素的化学潜力,假设在晶体和溶液之间取消分子内贡献.
- 进行了与尿素水溶液接触的尿素晶片的直接共存模拟.
- 用两个不同的尿素-水力场模型进行比较分析.
主要成果:
- 化学潜能计算为两种模型 (0.013-0.018和0.008-0.012摩尔分数) 提供了类似的溶解度预测.
- 预测的溶解度大约低于实验范围 (0.125-0.216摩尔分数) 的一个数量级.
- 直接共存模拟提供了广泛的可溶性极限,不完全涵盖化学潜在结果,但接近下限.
结论:
- 与实验数据相比,这两种模拟方法都低估了尿素的水溶性.
- 选择的力场显著影响计算的化学潜能值,尽管预测的溶解度是可比的.
- 为了准确的溶解性预测,需要进一步完善分子模型和模拟技术.
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