在冲击压缩下进行碳化合物的大规模模拟的原子集群扩张潜力
Jonathan T Willman1, Romain Perriot1, Christopher Ticknor1
1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The Journal of chemical physics
|August 9, 2024
概括
我们开发了一种机器学习潜力,可以在极端条件下模拟碳化合物. 这个工具准确地模拟超临界流体和冲击状态,推进材料科学模拟.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 物理化学 物理化学
背景情况:
- 在极端条件下 (高压,高温) 精确模拟碳化合物对于理解材料的行为至关重要.
- 现有的模型往往难以捕捉超临界和冲击碳化合物系统中复杂的结合和相变.
研究的目的:
- 为碳化合物开发一个高保真度的机器学习的原子间潜力.
- 为了能够准确地对碳化合物的原子模拟,在超临界流体状态附近和以上.
- 通过实验数据和量子力学计算来验证潜力.
主要方法:
- 开发一个原子集群扩展 (ACE) 的机器学习潜力.
- 训练潜力,使用碳化合物固态度和结合环境的多样化数据集.
- 通过大规模密度函数理论 (DFT) 分子动力学 (MD) 模拟,构建一个高保真度训练数据库.
- 实施用于DFT MD轨迹的新型结构选择方法.
主要成果:
- 该ACE潜力准确地复制同热,碳融化曲线,辐射分布函数,以及碳和碳化合物系统的冲击Hugoniots.
- 这种潜力在高达100 GPa的压力和高达6000 K (碳化合物) 和9000 K (纯碳) 的温度下得到验证.
- 在捕捉复杂的分子环境,包括反应性混合物和转基因稳定性固态度测量方面的准确性得到证明.
结论:
- 开发的ACE潜力为冲击碳化合物的大规模模拟提供了可靠的工具.
- 适配和验证机器学习原子间潜力的方法适用于其他复杂的分子系统,包括能量材料.
- 这项工作提升了材料科学中高准确度原子模拟的能力.
相关概念视频
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
6.3K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.3K
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
34.5K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
34.5K
Molecular Orbital Theory II
19.0K
Molecular Orbital Energy Diagrams
19.0K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.2K
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...
44.2K
Molecular Comparison of Gases, Liquids, and Solids
40.8K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
40.8K
Adiabatic Processes for an Ideal Gas
3.1K
When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
3.1K


