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相关概念视频

Ion Exchange01:17

Ion Exchange

395
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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.
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Formation of Complex Ions03:45

Formation of Complex Ions

23.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.0K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.1K
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...
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Ions as Acids and Bases02:54

Ions as Acids and Bases

22.9K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
22.9K
Ionic Bonds00:42

Ionic Bonds

117.3K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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使用聚离子复合离子的化物离子导体

Taehyun Kim1,2, Taeseung Kim1,2, Taegyoung Lee1,2

  • 1Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.

Journal of the American Chemical Society
|April 17, 2025
PubMed
概括

这项研究引入了化物离子导电新型材料. 这些材料包含聚离子化物,显著提高化物离子导电性,用于储能应用.

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科学领域:

  • 材料科学
  • 固态化学
  • 电化学

背景情况:

  • 离子 (H−) 导体固态材料对于电化学能源系统如电池和燃料电池至关重要.
  • 由于化物离子的反应性质,使得离子系统的多样化存在挑战,阻碍了最佳的运输.
  • 开发新的离子系统是推动离子导体设计的关键.

研究的目的:

  • 报告使用聚离子化物 (BH4−) 的化物离子导体.
  • 研究Sr1−xNaxLiH3−<0xE1><0xB5><0xA7>(BH4) 的结构和导电性质.
  • 探索共存的H−和BH4−离子和H−空位在增强离子导电性的作用.

主要方法:

  • 矿类化合物Sr1−xNaxLiH3−<0xE1><0xB5><0xA7>的合成和结构特征.
  • 通过阻抗光谱分析化物离子导电性.
  • 中子粉衍射以阐明阴离子和离子和导电通路之间的相互作用.

主要成果:

  • 在低x值下,在立方矿结构中稳定了与H−和BH4−共存的单相离子导体.
  • 加入H−空位 (增加y) 显著增强了H−和BH4−的秩序,使化物离子电导率提高了三倍.
  • 中子衍射揭示了BH4−和阳离子之间的不对称相互作用,通过较弱的相互作用途径促进导电.

结论:

  • 开发的矿类材料的高化物离子导电性在100°C时超过10−4 S cm−1.
  • H−和BH4−离子的共存和H−空位的战略引入是增强离子导电性的有效策略.
  • 复杂的离子,如化,显示为先进的化离子导体的新离子系统.