对密度函数和分散校正对二离子液体不同性质的性能进行比较评估 - 一个分子动力学研究 (AIMD) 的初始研究
Zahra Ostadsharif Memar1, Majid Moosavi1
1Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran. m.mousavi@sci.ui.ac.ir.
Physical chemistry chemical physics : PCCP
|October 8, 2024
概括
这项研究表明,将分散校正 (D3) 添加到密度函数理论 (DFT) 计算中,可以提高模拟二离子液体的准确性. 建议使用BLYP-D3功能来更好地预测结构和动态属性.
科学领域:
- 计算化学的计算化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 离子液体 (ILs) 是具有调节性质的多功能材料.
- 分离离子离子液体 (DILs) 由于其电荷密度而具有独特的特性.
- 精确模拟DILs需要仔细选择理论方法,包括密度函数和分散校正.
研究的目的:
- 调查DFT密度函数 (BLYP,PBE) 和分散校正 (D3) 对模拟基于伊米达的DIL ([C3(mim) [2][NTF2]2) 的影响.
- 将模拟结果与实验数据进行电子,结构和动态性能比较.
- 为了确定最佳的DFT功能和分散校正,以准确描述DIL行为.
主要方法:
- 使用BLYP和PBE函数进行了*ab initio*的分子动力学模拟,有或没有D3分散校正.
- 分析了辐射分布函数,结构因子,沃罗诺伊模块化和链接链形状.
- 计算了自我扩散系数,速度自相关函数,范霍夫相关函数,研究了离子动态,电子结构和振动光谱 (红外线,功率光谱).
主要成果:
- D3分散校正增强了阴离子和原子之间的相互作用,减少了结构异质性和链聚合.
- BLYP-D3功能表现出与实验性阴离子/离子自我扩散比率的改进一致,并更好地捕捉了键的动态.
- D3 校正显著影响双极时刻分布,并强化高波数的阴离子-离子气结合与BLYP 功能.
结论:
- 将D3分散校正应用于BLYP和PBE函数,可以提高模拟DIL属性的准确性.
- 在经过测试的方法中,BLYP-D3功能被确定为最合适的方法,用于准确描述研究的DIL的结构,动态和振动特性.
- 这项研究为选择适当的计算方法提供了关键的见解,用于未来对二离子液体的研究.
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