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相关概念视频

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Valence Bond Theory02:42

Valence Bond Theory

8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.4K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

2.0K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Transitions01:21

Phase Transitions

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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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通过固态相位过渡来增强二维Co-La协调框架中的质子导电.

Song-Song Bao1, Kazuya Otsubo, Jared M Taylor

  • 1State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, P. R. China.

Journal of the American Chemical Society
|June 20, 2014
PubMed
概括
此摘要是机器生成的。

一种新的2D 3d-4f酸盐材料 (CoLa-II) 过渡到一个新的相 (CoLa-III) 在45°C和93%相对湿度以上. 这种相位过渡显著提高了质子导电率的一个数量级.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学 有机化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 两维 (2D) 金属有机框架 (MOF) 正在积极研究能源应用.
  • MOF中的质子导电性对于开发先进的质子交换膜至关重要.
  • 了解MOF中的相位转换可以解锁新的功能.

研究的目的:

  • 为了合成和表征一种新的2D 3d-4f酸盐材料.
  • 为了研究在不同温度和湿度下合成材料的相变态行为.
  • 评估相位过渡对材料质子导电性的影响.

主要方法:

  • 单晶X射线衍射用于结构确定.
  • 热重力测量分析 (TGA) 和差分扫描热量测量 (DSC) 测量热稳定性.
  • 可变温度和可变湿度的粉末X射线衍射 (PXRD).
  • 电化学阻抗光谱 (EIS) 用于测量质子导电性.

主要成果:

  • 一种新的2D 3d-4f酸盐,[Co(III) La(III) ((notpH) ((H2O) 6),ClO4·5H2O (CoLa-II),已经成功合成.
  • 在45°C以上的温度和93%的相对湿度下,CoLa-II会发生可逆相变,变成[H3O][CoLa(notp) ((H2O) ][4]ClO4·3H2O (CoLa-III).
  • 阶段过渡涉及从内层到间层的质子迁移,导致质子导电率增加一个数量级.

结论:

  • 合成的2D 3d-4f酸盐表现出依赖湿度和温度的相变.
  • 这种过渡促进了物质内部增强的质子运输通路.
  • 该材料显示出在质子导体装置和膜中的应用潜力.