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相关概念视频

Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.0K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
15.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
27.6K
Intermolecular Forces03:13

Intermolecular Forces

61.1K
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...
61.1K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.8K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
63.8K
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

385
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
385
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.4K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.4K

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相关实验视频

Updated: Sep 10, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
06:44

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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在电场的氧化物电解质接口上调节水分离

Chunyi Zhang1,2, Zheng Yu1, Roberto Car1

  • 1Department of Chemistry, Princeton University, Princeton, NJ 08544.

Proceedings of the National Academy of Sciences of the United States of America
|August 20, 2025
PubMed
概括

电场在接口上显著改变了水的分裂,这对能源技术至关重要. 机器学习模拟揭示了电场如何控制水界分离和化学反应.

科学领域:

  • 表面化学
  • 计算材料科学
  • 电化学

背景情况:

  • 了解水的界面行为是能源应用的关键.
  • 电场在界面化学反应中起着至关重要的作用.

研究的目的:

  • 研究电场对异质接口中的水分离的影响.
  • 阐明电场控制的界面化学反应的机制.

主要方法:

  • 基于 Ab initio 的机器学习模拟.
  • 开发用于反应分析的机器学习集体变量.
  • 数以千计的水分离/重组事件的分析.

主要成果:

  • 微小的电场变化显著改变了TiO2-电解质接口的水解离分数.
  • 自由能量差异显示对电场变化的线性依赖 (1.97 eÅ 斜率).
  • 电场影响局部结构,有利于水分离,而不是个人能量障碍.

结论:

  • 电场对水界分离有明显的影响.
  • 揭示了电场控制的界面化学反应的机制.
  • 这些发现有助于人们更好地理解下一代能源技术.
关键词:
电化学机器学习分子动力学

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