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相关概念视频

Van der Waals Interactions01:24

Van der Waals Interactions

63.7K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
63.7K
Van der Waals Equation01:10

Van der Waals Equation

4.0K
The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
4.0K
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
Calculations of Electric Potential II01:27

Calculations of Electric Potential II

1.6K
An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
1.6K
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

1.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.1K
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

12.7K
The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
12.7K

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相关实验视频

Updated: Jun 16, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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范德瓦尔斯电极的电极

Jun Zhou1, Jing-Yang You2, Yi-Ming Zhao3

  • 1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.

Accounts of chemical research
|August 19, 2024
PubMed
概括
此摘要是机器生成的。

研究人员通过选超过67,000个晶体,发现了具有独特特性的新范德瓦尔斯 (vdW) 电极. 这些材料表现出新的磁性和潜在的先进应用,如K离子电池和内存设备.

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

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相关实验视频

Last Updated: Jun 16, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 计算材料 发现 发现

背景情况:

  • 电极是具有过多的电子作为离子作用的材料,不形成化学键.
  • 范德瓦尔斯 (vdW) 电极,特别是像LaBr2这样的二维形式,由于松散结合的阳离子电子,具有独特的特性.
  • 这些特性包括铁磁,超导,拓特征和迪拉克等离子体,在热电辐射,OLED和催化中具有潜在的应用.

研究的目的:

  • 通过广泛的计算选,发现新的范德瓦尔斯 (vdW) 电极.
  • 为了研究这些新发现的VDW电极的独特新兴特性,专注于磁性和电子行为.
  • 探索利用这些特性在先进技术应用中的战略.

主要方法:

  • 在材料项目数据库中对已知67,000多个无机晶体进行高通量计算选.
  • 对结构原型和阳离子电子属性的分析,将新发现与已建立的电极 (如Ca2N) 进行比较.
  • 理论研究磁力机制,电子结构和导致量子秩序现象的相互作用.

主要成果:

  • 发现了许多具有独特结构和电子特征的新型VDW电极.
  • 揭示了电极中无原子轨道铁磁的新型机制,这源于阴离子电子的双局部和扩展性质.
  • 识别复杂的相互作用导致诸如山谷极化,电荷密度波,超导和热电等属性.

结论:

  • 这一发现显著扩大了已知的VDW电极家族,为实验研究提供了新的途径.
  • vdW电极表现出可调节的磁性质和丰富的量子现象景观.
  • 这些材料对下一代技术具有显著的前景,包括旋转轨道扭矩内存,山谷电子,K离子电池和热电器件.