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相关概念视频

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.5K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
10.2K

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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用化学精确的分子构建块进行超级晶格工程

Xiao-Yun Yan1,2, Qing-Yun Guo1,2, Xian-You Liu1

  • 1South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou 510640, China.

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|December 16, 2021
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概括

研究人员设计了巨大的分子, 这项工作推进了复杂,有序材料的理性设计,

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科学领域:

  • 材料科学
  • 超分子化学
  • 纳米技术

背景情况:

  • 纳米级构建块的合理设计对于创建具有类似于金属合金的新兴性质的超级格子至关重要.
  • 由于分子灵活性和复杂的自我组装过程,与超级网格形成相关的分子特征存在挑战.
  • 单元系统的体积不对称性有限,阻碍了新型超级网的出现.

研究的目的:

  • 为了证明专门设计的分子系统可以产生多种不同传统的超级网格.
  • 使用巨型分子探索单元和二元系统中控制格子形成的原理.
  • 了解分子积分学,拓学和尺寸差异对中原子和由此产生的超级格子的影响.

主要方法:

  • 设计和合成四种类型的巨大分子.
  • 在单元 (单元) 和混合元件 (二元) 系统中系统地探索格子形成原理.
  • 分析分子特征如何影响中等尺度超级网格的形成.

主要成果:

  • 从设计的巨型分子中形成的非传统超级网结构的演示.
  • 确定控制超级网格形成的关键分子参数 (立体测量,拓,大小).
  • 观察到的新型超级网与已知的软物质弗兰克-卡斯珀相的相关性.

结论:

  • 正确设计的分子系统可以导致广泛的非传统超级网格.
  • 了解分子设计原理可以合理制造复杂的超级网格.
  • 这种方法为先进材料提供了可扩展的准备和简单的加工.