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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

13.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.5K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

222
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
222
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

9.1K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
9.1K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

47.2K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
47.2K
Chemical Bonds02:40

Chemical Bonds

16.6K

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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相关实验视频

Updated: Jul 12, 2025

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
13:09

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

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从钻石到BC8碳的双冲击压缩路径.

Jiuyang Shi1, Zhixing Liang1, Junjie Wang1

  • 1National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

Physical review letters
|October 20, 2023
PubMed
概括

科学家们使用一种新的双冲击压缩方法实现了难以捉摸的BC8碳相. 这一由机器学习实现的突破,为探索碳的探索开辟了新的途径.

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures

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An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
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An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

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Last Updated: Jul 12, 2025

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
13:09

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
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科学领域:

  • 材料科学 材料科学 材料科学
  • 高压物理 高压物理
  • 计算化学计算化学

背景情况:

  • 碳的意义涵盖了各种科学领域.
  • 几十年来,BC8碳阶段在理论上已经得到预测,但在实验上没有得到证实.
  • 之前的合成BC8碳的实验尝试都没有成功.

研究的目的:

  • 开发一种可靠的方法来合成BC8碳相.
  • 为BC8碳的存在提供实验证据.
  • 在极端条件下探索BC8碳形成的热力学途径.

主要方法:

  • 在高压下对碳的机器学习潜力的开发,根据第一原则计算.
  • 利用基于机器学习潜力的分子动力学模拟.
  • 设计和模拟双冲击压缩实验路径.

主要成果:

  • 通过双冲击压缩设计了一个可行的热力学途径来合成BC8碳.
  • 钻石被压缩到超冷液态,然后凝固到BC8阶段.
  • 关键核大小和核化速率的计算为实验观测提供了参数.

结论:

  • 该研究提出了一种可行的实验方法来合成长期寻求的BC8碳相.
  • 实现BC8碳依赖于形成一个足够超冷的液态.
  • 这项研究弥合了理论预测和BC8碳的实验实现之间的差距.