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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
X-ray Crystallography02:18

X-ray Crystallography

23.9K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.9K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.0K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.0K
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
Structures of Solids02:22

Structures of Solids

14.2K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.2K

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相关实验视频

Updated: Jul 7, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

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在原子失序的钻石中,温度依赖的半晶核形成.

ZhongTing Zhang1, ZhouYu Fang1, HengAn Wu1,2

  • 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China.

Nano letters
|December 22, 2023
PubMed
概括

原子无序的钻石表现出独特的特性. 模拟显示,准晶体钻石的形成取决于温度,有利于其独特结构的特定温度范围.

关键词:
无形碳素是无形的碳.原子不顺序的钻石 原子不顺序的钻石表面的自由能量表面的自由能量准晶体钻石 准晶体钻石

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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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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相关实验视频

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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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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
  • 计算材料科学科学 计算材料科学
  • 纳米技术 纳米技术

背景情况:

  • 最近的实验已经产生了具有中等范围秩序的原子失序钻石,扩大了对原子失序的理解.
  • 现有的无形碳模型不能完全解释与其他四面体无形碳 (ta-Cs) 相比,对晶体钻石 (p-D) 的独特形成.
  • p-D的形成对温度敏感,这表明热条件起着关键作用.

研究的目的:

  • 通过原子模拟,研究在原子无序钻石中对晶体钻石的温度依赖的核化机制.
  • 在不同温度下阐明不同四面体无形碳结构之间的相位过渡.
  • 为了确定有利于形成准晶体钻石的特定温度范围.

主要方法:

  • 基于原子的模拟被用来模拟无序的钻石结构的行为.
  • 使用元动力学模拟来探索相变的自由能量场景.
  • 用两个精心设计的集体变量来跟踪和分析不同ta-Cs之间的可逆相变.

主要成果:

  • 模拟显示了在不同温度下各种ta-Cs之间的可逆相变,并得到了自由能量表面分析的支持.
  • 发现准晶体钻石 (p-D) 在狭窄的特定温度范围内优先形成.
  • 确定p-D形成的温度范围与使用阿雷尼乌斯框架分析时实验观察到的条件一致.

结论:

  • 准晶体钻石的形成与特定的温度条件密切相关.
  • 原子模拟为了解无形碳材料的形成路径提供了强大的工具.
  • 这些发现为其他类型无形碳的研究和受控合成提供了新的视角.