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Ion Exchange01:17

Ion Exchange

596
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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Intermolecular Forces03:13

Intermolecular Forces

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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...
58.5K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.5K
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...
1.5K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.2K
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.
63.2K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.7K
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...
14.7K
Ionic Bonds00:42

Ionic Bonds

118.5K
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...
118.5K

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在区块共聚合物电解质中通过使用混合离子液体的界面被动化提高了离子导电性.

Jaemin Min1, Suhyun Bae1, Daisuke Kawaguchi2

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

The Journal of chemical physics
|November 3, 2023
PubMed
概括

将混合的离子液体引入块共聚合物电解质中,可以显著提高离子导电性. 这一策略增强了先进固态聚合物电解质的离子运输.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 聚合物科学 聚合物科学

背景情况:

  • 块共聚合物电解质对于固态能量储存至关重要.
  • 提高这些材料的离子导电性是一个关键的挑战.
  • 离子液体 (ILs) 提供了改善离子传输的潜力.

研究的目的:

  • 开发一种战略方法,以提高区块共聚合物电解质中的离子导电性.
  • 为了研究混合离子液体的不同摩尔比对电解质性能的影响.
  • 合成和表征新型聚合物矩阵,以改善离子传输.

主要方法:

  • 聚4-styrenesulfonate) -b-polymethylbutylene (SSMB) 和聚4-styrenesulfonyl (trifluoromethanesulfonyl) imide) -b-polymethylbutylene (STMB) 聚合物矩阵的合成. 这两种聚合物基因组分别是:
  • 将混合离子液体 (含有BF4或TFSI离子的伊米达离子) 纳入聚合物矩阵.
  • 块共聚合物电解质结构的表征,接口特性和离子导电性.

主要成果:

  • 混合IL的SSMB和STMB电解质都表现出六角圆柱形结构.
  • 由于强大的库伦和键相互作用,STMB电解质显示出增强的分离强度.
  • 由于有效的离子扩散和减少的离子捕获,SSMB电解质显示出改善的离子导电性,超过理论平均值.

结论:

  • 在区块共聚合物电解质中混合离子液体的战略性使用可以显著提高离子导电性.
  • 聚合物矩阵和离子液体组件的选择极大地影响了接口特性和离子传输机制.
  • 这种方法为开发用于能源应用的高性能固态聚合物电解质提供了有希望的途径.