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関連する概念動画

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

2.4K
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...
2.4K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.7K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
19.7K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.4K
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. 
48.4K
Ion Exchange01:17

Ion Exchange

1.1K
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...
1.1K
Formation of Complex Ions03:45

Formation of Complex Ions

25.5K
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...
25.5K
Intermolecular Forces03:13

Intermolecular Forces

68.5K
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...
68.5K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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カップリングカチオン-アニオンダイナミクスは,室温の超陽性固体電解質におけるカチオン移動性を高めます.

Zhizhen Zhang1, Pierre-Nicholas Roy1, Hui Li1,2

  • 1Department of Chemistry, and the Waterloo Institute of Nanotechnology , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada.

Journal of the American Chemical Society
|November 9, 2019
PubMed
まとめ
この要約は機械生成です。

アニオンフレームのダイナミクスは,固体電解質のイオン移動性に大きく影響する. Na11Sn2PSe12とNa11Sn2PSe12の簡単なアニオン回転は,固体電池の開発の重要な発見であるナトリウムイオン拡散を高める.

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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科学分野:

  • 材料科学
  • 固体化学
  • 電気化学

背景:

  • 先進的な固体電池には 単離導電精が不可欠です
  • 高いイオン流動性を制御するメカニズムを理解することは不可欠ですが,依然として困難です.
  • カチオン輸送におけるアニオンフレームのダイナミクスの役割は完全に解明されていません.

研究 の 目的:

  • 固体電解質のNa11Sn2PnX12におけるイオン輸送に対するアニオンフレームのダイナミクスの影響を調査する.
  • アニオン回転とカチオン移動の関係を解明する.
  • 素早いイオン導体におけるイオン伝導機構の基本的な理解を確立する.

主な方法:

  • 最大エントロピーメソッドによる中性子粉の微分データ分析.
  • アブ・イニシオ分子動力学シミュレーション
  • 関節時間相関分析 カチオン-アニオン相互作用を研究する.

主要な成果:

  • アニオンフレームのダイナミックレスポンスがイオン移動性に大きく影響することを実証した.
  • 超イオン Na11Sn2PS12 と Na11Sn2PSe12 の容易な[PX4]3-イオン回転が観察され, Na11Sn2SbS12 の阻害された回転と対照的である.
  • アニオン回転が,拡散ボトルネックを拡大することによって,長距離カチオン移動性を結合し,強化する直接的な証拠を提供した.

結論:

  • アニオン回転ダイナミクス,特にパドルホイールメカニズムは,ロータフェーズにおけるカチオン移動を強化する上で重要な役割を果たします.
  • 共同時間相関分析は,従来の移行状態理論を超えて,カチオン-アニオン相互作用を研究するための新しいアプローチを提供します.
  • アニオン回転ダイナミクスは,固体電池のための次世代の高速イオン導体の開発のための普遍的な設計原理を表しています.