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相关概念视频

Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

11.7K
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...
11.7K
Crystal Density01:19

Crystal Density

10
The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor...
10

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相关实验视频

Updated: May 7, 2026

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
08:46

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

Published on: January 15, 2014

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在分子分辨率下跟踪立方冰

Xudan Huang1,2, Lifen Wang3,4, Keyang Liu5

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.

Nature
|March 29, 2023
PubMed
概括
此摘要是机器生成的。

科学家们观察到立方体冰的形成, 这一发现使用先进的显微镜, 澄清了冰的结晶及其结构.

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

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相关实验视频

Last Updated: May 7, 2026

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
08:46

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

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科学领域:

  • 材料科学
  • 物理化学
  • 地质学

背景情况:

  • 冰在地球气候和各种科学应用中起着至关重要的作用.
  • 了解冰的形成和结构至关重要,
  • 关于立方体冰的形成已经存在长期的争论,

研究的目的:

  • 研究立方冰的形成行为和结构.
  • 解决关于立方冰是否可以与六角冰形成的争论.
  • 为了可视化冰结晶的分子级动态.

主要方法:

  • 低剂量成像的冷传导电子显微镜 (冷TEM).
  • 在102K控制的水蒸气沉积.
  • 进行分子动力学模拟.

主要成果:

  • 在低温接口上证明了立方冰的偏好核化.
  • 观察到立方冰和六角冰的分离结晶.
  • 发现了立方体冰缺陷和堆积障碍.
  • 通过模拟揭示了结构演变的动态.

结论:

  • 立方冰可以形成与六角冰分离的不同阶段.
  • 在分子层面提供直接的真实空间冰的成像.
  • 这项研究为研究冰和其他结晶开辟了新的途径.