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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.
61.9K
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

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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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関連する実験動画

Updated: May 11, 2025

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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ハイドリドイオン導体とポリイオン複合アニオン

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
まとめ

この研究は,ヒドリドイオン伝導のための新しいペロブスキートタイプの材料を導入します. これらの材料はポリイオンボロヒドリドを組み込み,エネルギー貯蔵アプリケーションのヒドリドイオン伝導性を大幅に高めます.

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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科学分野:

  • 材料科学
  • 固体化学
  • 電気化学

背景:

  • 水素イオン (H−) 伝導性固体材料は,電池や燃料電池などの電気化学エネルギーシステムにとって不可欠です.
  • ハイドリドイオンの反応性により,最適の輸送を阻害するアニオンシステムの多様化に課題があります.
  • 新しいアニオンシステムの開発は,ヒドリドイオン導体設計を進めるための鍵です.

研究 の 目的:

  • ポリアニオンボロヒドリド (BH4−) を利用したペロブスキートタイプの新型ヒドリドイオン導体について報告する.
  • Sr1−xNaxLiH3−<0xE1><0xB5><0xA7>(BH4) γの構造と伝導性を調査する.
  • イオン伝導性を高めるために,共存するH−とBH4−アニオンとH−空白の役割を調査する.

主な方法:

  • ペロブスキート型化合物の合成と構造的特徴付け Sr1−xNaxLiH3−<0xE1><0xB5><0xA7>(BH4)γ.
  • 阻力スペクトロスコーピーによる水素イオン伝導性の分析.
  • アニオンとカチオンと伝導経路の相互作用を明らかにするために,中性子粉の difraktion.

主要な成果:

  • H−とBH4−が共存する単相水素イオン導体は,低x値で立方ペロブスキート構造で安定した.
  • H−空位を組み込み (yを増加させる) は,H−とBH4−の乱れを大幅に高め,ヒドリドイオン伝導性を3度増加させた.
  • 中性子 difraktionは,BH4−とカチオン間の非対称な相互作用を明らかにし,より弱い相互作用経路を通じて伝導を促進しました.

結論:

  • 100 °Cで10−4 S cm−1を超える高ヒドリドイオン伝導性は,開発されたペロブスキートタイプの材料で達成された.
  • H−とBH4−アニオンの共存とH−空白の戦略的導入は,水素イオン伝導性を高めるための効果的な戦略である.
  • ボロヒドリドなどの複雑なアニオンは,高度なヒドリドイオン導体のための新しいアニオンシステムとして有望である.