基于GAFF的离子液体的极化力场开发和验证
1Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.
The journal of physical chemistry. B
|January 16, 2024
概括
一个基于一般珀力场 (GAFF) 的新德鲁德振荡器模型准确地预测了离子液体 (IL) 的特性. 这种可偏振的力场改进了IL模拟的经典模型.
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:
- 离子液体 (ILs) 是多功能材料,在气体分离,电化学,滑和催化等领域都有应用.
- 准确预测IL特性需要可靠的分子模拟和高质量的力场.
- 经典的固定电荷模型经常表现出局限性,例如缓慢的动力学和无法捕捉偏振效应.
研究的目的:
- 开发基于一般珀力场 (GAFF) 的离子液体极化德鲁德振荡器模型.
- 评估开发的模型对基于 imidazolium 和 pyrrolidinium 的 ILs 的性能.
- 为了将新模型与IL模拟的现有力场进行比较.
主要方法:
- 根据CL&Pol协议开发Drude振荡器模型,与GAFF力场集成.
- 对八种不同的离子液体进行了分子模拟.
- 模拟结果 (密度,自我扩散率,结构性质) 与实验数据和其他力场模型的比较.
主要成果:
- 开发的基于GAFF的德鲁德模型为研究ILs的密度,自我扩散性和结构性质提供了合理的估计.
- 与经典的固定电荷模型相比,可极化模型的准确性得到了提高.
- 该模型显示了基于imidazolium和pyrrolidinium的离子液体的良好性能.
结论:
- 基于GAFF的德鲁德振荡器模型是模拟离子液体的可行和准确方法.
- 这项工作提出了一种简单的方法,可以将GAFF力场扩展到更广泛的离子液体中.
- 开发的模型提供了一个计算效率高的路线来预测IL特性,有助于材料设计和应用选.
更多相关视频
相关概念视频
02:28Intermolecular Forces in Solutions
33.7K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
33.7K
02:48Bond Polarity, Dipole Moment, and Percent Ionic Character
28.9K
Bond Polarity
28.9K
03:13Intermolecular Forces
58.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.3K
02:56Intermolecular Forces and Physical Properties
20.8K
20.8K
02:54Molecular and Ionic Solids
17.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.1K
02:34Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.4K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.4K