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相关概念视频

Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.0K
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.
63.0K
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
Intermolecular Forces03:13

Intermolecular Forces

58.3K
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...
58.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.1K
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...
17.1K
Ionic Bonds00:42

Ionic Bonds

118.4K
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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Ion Exchange01:17

Ion Exchange

592
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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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离子溶剂外驱动有机混合离子电子导体中的电感应.

Filippo Bonafè1, Francesco Decataldo1, Tobias Cramer1

  • 1Department of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna, 40127, Italy.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 2, 2024
PubMed
概括

一种新的调制电化学原子力显微镜 (mEC-AFM) 技术揭示了水合离子如何在有机混合离子电子导体 (OMIEC) 中驱动人工肌肉激活. 这种方法表明,OMIEC微型执行器可以实现小于毫秒的操作.

关键词:
电化学驱动的电化学驱动.电化学原子力显微镜 电化学原子力显微镜电波波动是一种电流波动.离子运输 离子运输 离子运输有机混合离子电子导体 有机混合离子电子导体

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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
  • 纳米技术纳米技术

背景情况:

  • 有机混合离子电子导体 (OMIEC) 对人工肌肉执行器至关重要.
  • 了解电动启动机制是改善OMIEC设备性能和寿命的关键.
  • 目前的表征方法缺乏在微观尺度上探测这些过程的分辨率.

研究的目的:

  • 引入一种新的操作技术,即调制电化学原子力显微镜 (mEC-AFM),用于电活性材料的微观表征.
  • 阐明地方一级的OMIEC中电动启动的基本机制.
  • 为了确定基于OMIEC的设备的电动启动传输功能和操作时间表.

主要方法:

  • 调制电化学原子力显微镜 (mEC-AFM) 的开发和应用.
  • 多维光谱检测局部电感应和电荷吸收.
  • 多通道mEC-AFM成像用于绘制聚乙烯硫酸盐 (PEDOT:PSS) 微电极的电感应振幅,相位和表面形态图.

主要成果:

  • 通过mEC-AFM技术,可以访问电动启动传输函数.
  • 光谱测量和成像显示,水合离子漂移控制了电感应振幅和时间尺度.
  • 发现水扩散并不是调动速度的限制因素.

结论:

  • 化离子动力学是OMIEC中电动启动性能的主要决定因素.
  • 该研究表明,OMIEC微执行器可以在小于毫秒的时间尺度上有效运行.
  • mEC-AFM技术为表征电活性材料和优化执行器设计提供了一个强大的新工具.