有机混合离子电子导体的等级结构及其在水中的演变
Yael Tsarfati1,2, Karen C Bustillo2, Benjamin H Savitzky2
1Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.
Nature materials
|September 27, 2024
概括
研究人员使用先进的显微镜研究了聚合物有机混合离子电子导体. 液晶结构保持电子传输,即使在水合,对于设备的性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 电化学 电化学 电化学
背景情况:
- 聚合物有机混合离子电子导体对于电化学技术至关重要.
- 它们的性能受到水性环境中的微观结构变化的影响.
- 了解这些变化是优化设备功能的关键.
研究的目的:
- 为了研究一个模型有机混合离子电子导体的多尺度结构.
- 分析水合对聚合物的微观结构和液晶性质的影响.
- 确定结构变化如何影响电子传输属性.
主要方法:
- 使用了冷四维扫描传输电子显微镜 (4D-STEM).
- 该研究检查了干燥和水合状态的材料.
- 导向映射用于分析结构秩序和缺陷.
主要成果:
- 4D-STEM在聚合物晶体区域内发现了缺陷.
- 由于水分的膨胀主要导致局部疾病,保持整体液晶秩序.
- 液晶介质结构表现出对电解质入的强度.
结论:
- 低温4D-STEM为复杂的聚合物提供了有价值的多尺度结构见解.
- 液晶介质结构提高了在水合条件下电子传输的稳定性.
- 这种理解对于设计先进的有机电子设备至关重要.
相关概念视频
Electrolyte and Nonelectrolyte Solutions
62.4K
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.
62.4K
Ionic Bonds
118.1K
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...
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...
118.1K
Aqueous Solutions and Heats of Hydration
14.6K
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...
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...
14.6K
Ionic Bonding and Electron Transfer
41.3K
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.
41.3K
Ionic Crystal Structures
14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Formation of Complex Ions
23.5K
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...
23.5K


