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相关概念视频

Electric Field of Two Equal and Opposite Charges01:30

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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Ionic Strength: Effects on Chemical Equilibria01:19

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Aqueous Solutions and Heats of Hydration02:42

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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.
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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...
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Ionic Bonding and Electron Transfer02:48

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Colligative Properties of Electrolytes
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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了解多价盐溶液中远程相反电荷排斥的理解

Nikhil R Agrawal1, Carlo Carraro1, Rui Wang1,2

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概括
此摘要是机器生成的。

负荷相反的表面之间的排斥来自强烈的离子-离子相关性,而不是表面过电. 这种在多价离子中观察到的现象是长距离的,并且随着盐度的增加而增加.

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科学领域:

  • 物理化学 物理化学
  • 合体和表面科学科学

背景情况:

  • 离子之间的静电相关性对于电气双层结构和力量至关重要.
  • 在各种科学和工程领域,了解充电表面之间的力量是关键.

研究的目的:

  • 为了研究负荷相反的表面之间的反直觉排斥.
  • 探索相反电荷排斥和表面过电之间的关系.
  • 阐明离子-离子相关性在这些现象中的作用.

主要方法:

  • 修改后的高斯重新规范化的波动理论的应用.
  • 对空间变化的离子-离子相关性进行准确的计算.
  • 对多价离子 (双价,三价,四价) 的量化比较与模拟结果.

主要成果:

  • 成功地捕获了相反电荷的表面之间的排斥力,与模拟一致.
  • 证明了长距离的相反电荷排斥 (几纳米) 取决于多价离子度.
  • 鉴定了因离子积累而导致的透压的增加作为排斥的起源,与过度充电不同.

结论:

  • 反电荷排斥是由离子-离子相关性和透压的增加驱动的,而不是表面过电.
  • 排斥强度随着多价盐度的增加而单调地增加.
  • 反电荷排斥和过电荷之间没有因果关系;它们可以独立发生.