Ab Initio 在没有人工高温的情况下模拟液态水
Chenyu Wang1, Wei Tian1, Ke Zhou1
1College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou 215006, China.
Journal of chemical theory and computation
|September 2, 2024
概括
一种新的计算方法,规范化SCAN (rSCAN),准确地模拟了液态水的结构和环境条件下的动态. 这种方法消除了对人工高温的需求,改善了水系统的模拟.
科学领域:
- 计算化学是一种计算化学.
- 材料科学是一种材料科学.
- 物理化学 物理化学
背景情况:
- 精确模拟水的结构和动态对于海水淡化,离子分离,电催化和生物化学过程至关重要.
- 现有的初始分子动力学 (AIMD) 方法需要人工高温 (AHT) 来模拟水中的量子效应,这对于多相系统来说是不够的.
- 由于其他阶段的声子激活,AHT可以高估界面和溶液中的水动力学.
研究的目的:
- 开发和验证一种计算方法,在没有AHT的环境条件下准确模拟液态水.
- 评估规范化SCAN (rSCAN) 功能用于建模水结构和动态的性能.
- 评估rSCAN对各种离子的水化结构的准确性.
主要方法:
- 使用了初始分子动力学 (AIMD) 模拟.
- 使用规范化的SCAN (rSCAN) 功能.
- 将模拟结果与液态水和离子水结构的实验数据进行比较.
主要成果:
- rSCAN功能精确地捕捉了环境条件下的液态水的结构和动态,消除了对AHT的需求.
- rSCAN显示出与,土和化离子的水合结构的实验数据的良好一致.
- 这些发现表明rSCAN能够有效地建模水系统.
结论:
- 功能性rSCAN为模拟水性环境提供了通用和准确的方法.
- rSCAN是水中化学过程的初始模拟的一个有前途的工具.
- 这种方法克服了AHT在模拟复杂水系统中的局限性.
相关概念视频
States of Water
50.6K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
50.6K
Deriving the Speed of Sound in a Liquid
485
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
485
Heating and Cooling Curves
22.8K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
22.8K
Role of Water in Human Biology
8.4K
Water is the one of the most significant components of the human body; it plays a crucial role in several physiological activities because of its unique physicochemical properties. Importantly, it helps to regulate body temperature and is the chief component of several body fluids.
Water's Solvent Properties
Since water is a polar molecule with slightly positive and slightly negative charges, ions and polar molecules can readily dissolve in it. Therefore, it is referred to as a solvent, a...
Water's Solvent Properties
Since water is a polar molecule with slightly positive and slightly negative charges, ions and polar molecules can readily dissolve in it. Therefore, it is referred to as a solvent, a...
8.4K
Vapor Pressure of Fluid
1.3K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
1.3K
Classifying Matter by State
73.7K
Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars.
73.7K


