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相关概念视频

Nuclear Binding Energy02:13

Nuclear Binding Energy

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The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.5K
The Energies of Atomic Orbitals03:21

The Energies of Atomic Orbitals

29.9K
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
29.9K
Chemical Bonds02:40

Chemical Bonds

20.9K

Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
30.6K
Ionic Bonds00:42

Ionic Bonds

127.8K
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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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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核心级结合能描述了离子液体原子核中的静电电位.

Frances K Towers Tompkins1, Ekaterina Gousseva1, Roger A Bennett1

  • 1Department of Chemistry, University of Reading, Reading, UK. k.r.j.lovelock@reading.ac.uk.

Physical chemistry chemical physics : PCCP
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PubMed
概括

通过X射线光电子光谱学 (XPS) 测量的核心级结合能是离子液体 (IL) 的有效电子描述器. 这些能量与计算的静电电位量有定量相关,有助于预测应用程序的IL特性.

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科学领域:

  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学
  • 计算化学计算化学

背景情况:

  • 离子液体 (ILs) 具有由静电相互作用驱动的可调节性质.
  • 开发准确的IL电子描述器对于理解和优化其应用至关重要.
  • 来自X射线光电子光谱 (XPS) 的核心级结合能 (E_B(核心)) 是潜在的实验描述器.

研究的目的:

  • 确定核心级绑定能量 (E_B(核心)) 作为离子液体 (IL) 中静电电位 (V_n) 的可靠描述器.
  • 用计算方法验证实验E_B (核心) 和计算V_n之间的定量关系.
  • 探索这些描述符对预测IL行为和为特定应用设计新的IL的影响.

主要方法:

  • 利用初始分子动力学 (AIMD) 模拟来计算原子核的静电电位 (V_n).
  • 使用X射线光电子光谱学 (XPS) 实验测量核心级结合能 (E_B(核心)) .
  • 对ILs中的各种元素进行实验E_B (核心) 和计算V_n之间的定量相关性分析.

主要成果:

  • 在实验E_B (核心) 和C,N,S,O和F的计算V_n之间展示了明确的定量线性相关性,在IL和离子中.
  • 已确立的E_B (核心) 作为可化学解释的描述符,反映了ILs内部的静电相互作用.
  • 展示了V_n在表征IL与表面和接口的相互作用方面的潜力.

结论:

  • 核心级绑定能 (E_B(core)) 是对离子液体 (IL) 的有效和化学可解释的电子描述符.
  • 这项工作使得通过将实验和计算数据关联起来,可以预测针对特定应用的最佳IL组合.
  • 这些发现为在表面和接口上研究IL相互作用开辟了新的途径.