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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

15.9K
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...
15.9K
Metallic Solids02:37

Metallic Solids

20.3K
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....
20.3K
Valence Bond Theory02:42

Valence Bond Theory

10.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.8K
Valence Bond Theory02:45

Valence Bond Theory

48.8K
Overview of Valence Bond Theory
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Bonding in Metals02:32

Bonding in Metals

51.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
51.4K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

59.6K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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相关实验视频

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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通过自我插曲的工程共价结合的2D层材料

Xiaoxu Zhao1,2, Peng Song2, Chengcai Wang3

  • 1Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore.

Nature
|May 15, 2020
PubMed
概括

研究人员开发了自我合, 创建了新的超薄, 联的二维材料. 这种方法可以通过控制过渡金属二原体内的原生原子位置来调整性能.

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科学领域:

  • 凝聚物质物理学
  • 材料科学
  • 纳米技术

背景情况:

  • 二维 (2D) 材料对于探索拓学和多体物理学至关重要.
  • 两维材料的合可以产生新的特性,但生长后的方法是有限的,通常是金属.

研究的目的:

  • 引入一种新的方法,通过自我合来制造超薄,共价结合的二维材料.
  • 通过受控的石化测量和间隔原子的排列来证明材料特性.
  • 探索新的材料组成及其潜在的特性,如磁性.

主要方法:

  • 在双层过渡金属二基的生长过程中开发了一种自我插曲技术.
  • 使用高金属化学潜力来实现本地原子的受控合.
  • 合成并描述了各种间的TaS(Se) y相,包括Ta9S16,Ta7S12,Ta10S16,Ta8Se12 (卡戈姆晶格) 和Ta9Se12.

主要成果:

  • 成功地产生了一种名为ic-2D的超薄,共价结合材料.
  • 通过变化的间隔覆盖和排列来证明对静态度和性能的控制.
  • 在一些合成的合相中观察到铁磁秩序,并成功地生长了其他自我合化合物 (V11S16,In11Se16,FexTey).

结论:

  • 自动插入是一种可行的方法,用于合成具有可调和,依赖于静态度的新型二维材料.
  • 这种方法扩大了2D材料的范围,超出了传统的合技术所能实现的范围.
  • 合成的ic-2D材料为基础物理研究和潜在应用提供了一个有前途的平台.