实验和古典模拟之间的电导率差异揭示了水氧化物和在水溶液中的自我扩散系数和离子寿命
V Jelle Lagerweij1, Othonas A Moultos1, Thijs J H Vlugt1
1Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 39, 2628CB Delft, The Netherlands.
经典分子动力学与实验数据相结合,可以准确地确定离子在水溶液中的自我扩散和寿命,有效地捕获Grotthuss转移机制.
科学领域:
- 物理化学 物理化学
- 计算化学的计算化学
- 材料科学 材料科学 材料科学
背景情况:
- 格罗特萨斯转移机制显著增强了氧化物和离子在水中的自我扩散.
- 机器学习分子动力学在模拟这种复杂的离子运输方面表现有前途.
研究的目的:
- 为了证明经典的分子动力学,加上实验电导率,可以准确地确定离子自我扩散系数和寿命.
- 为了验证这种方法在各种度和温度对水性KOH,NaOH和HCl溶液.
主要方法:
- 增加经典的分子动力学轨迹与一个有偏见的随机步行,以模拟车辆运输和Grotthuss转移.
- 使用实验电导率数据校准随机步行的度和温度依赖.
- 将模拟和实验电导率进行比较,以验证模型.
主要成果:
- 计算的自我扩散系数与无限稀释和机器学习结果的实验测量结果保持一致.
- 该方法可以准确地确定离子寿命,而不会对Grotthuss转移事件的定义敏感.
- 计算的自我扩散系数和电导率是稳定的,不管格罗塔斯的转移定义.
结论:
- 经典分子动力学与实验导电数据相结合,为研究水溶液中的离子运输提供了一种可靠的方法.
- 这种方法提供了准确的自我扩散系数和离子寿命,克服了以前方法的局限性.
- 这些发现有助于更好地了解电解质中的质子和氧化离子流动性.
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