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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.7K
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...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.1K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

14.5K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
14.5K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

73.4K
Dipole Moment of a Molecule
73.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.1K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.1K

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相关实验视频

Updated: Jan 9, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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形状异构性控制2D融路径.

Yu D Fomin1, A V Mikheyenkov1, E N Tsiok1

  • 1Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe shosse, 14, Troitsk, Moscow 108840, Russia.

The Journal of chemical physics
|December 9, 2025
PubMed
概括
此摘要是机器生成的。

粒子形状异质性决定了2D系统中的化. 较弱的异性质 (k<1.15) 显示混合化,而较高的异性质 (k≥1.15) 则遵循连续的贝雷津斯基-科斯特利茨-托勒斯过渡.

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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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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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 统计力学就是统计力学.
  • 材料科学是一种材料科学.

背景情况:

  • 融化在二维 (2D) 系统中是复杂的,受到拓缺陷和热波动的影响.
  • 对于材料设计来说,了解异性质系统中的相变是非常重要的.

研究的目的:

  • 通过使用Gay-Berne潜力,研究具有可调整形状异性质的2D粒子的融机制.
  • 确定粒子面积比和异性强度在调节融路径中的作用.

主要方法:

  • 采用了分子动力学 (MD) 模拟.
  • 模拟粒子通过Gay-Berne潜力相互作用,在弱异性异性状态 (1.0 ≤ k ≤ 1.2) 中.
  • 分析了不同粒子面积比的融化行为.

主要成果:

  • 融机制严重依赖于颗粒面积比 (异极性,k).
  • 一个混合的伯纳德-克劳斯化场景 (连续的晶体-六度,第一阶段的六度-液体) 发生在k < 1.15.
  • 观察到一个完整的Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young情景 (两个连续的过渡) 在k ≥1.15时.
  • 二元混合物抑制第一阶段的转换,有利于持续的化.

结论:

  • 弱形态异构性作为2D系统化的基本切换参数.
  • 这项研究揭示了由异构性支配的普遍化行为.
  • 结果提供了对控制异型二维材料相变的见解.