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相关概念视频

Calculation of Electric Flux01:25

Calculation of Electric Flux

Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric field, the...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
11:25

In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries

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设计用于电荷逆转的表面.

James R Matthews1, Dönüs Tuncel, Robert M J Jacobs

  • 1Contribution from the Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK. harry.anderson@chemistry.ox.ac.uk

Journal of the American Chemical Society
|June 6, 2003
PubMed
概括

研究人员开发了响应pH的表面,可以将电荷从正变为负. 这种受控的表面电荷是可逆的,对于静电自组装应用有用.

科学领域:

  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学
  • 纳米技术 纳米技术

背景情况:

  • 控制表面电荷对于自组装和分离等应用至关重要.
  • 开发具有可调整表面性能的材料是纳米技术的一个持续挑战.

研究的目的:

  • 为了创建具有pH可切换电荷特性的表面.
  • 为了研究连接器长度对电荷逆转行为的影响.
  • 探索这些表面对于静电自组装的潜力.

主要方法:

  • 和黄金基板的功能化与氨基二酸单位.
  • 在pH范围内使用紫外线吸收和反射光谱监测染料吸附 (阴离子和阴离子).
  • 黄金表面的特征与不同长度的二硫化物链接器.
  • 研究可逆和不可逆的质子触发电荷切换.

主要成果:

  • 表面表现出可逆电荷切换从阴离子 (pH < 3) 到阴离子 (pH > 5) 的情况.
  • 染料吸附行为证实了依赖pH的表面电荷.
  • 黄金表面上较长的链接器导致电荷逆转的pH范围较窄.
  • 与相比,功能化黄金表面的吸附动力学显著更快.

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
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Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
09:20

A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

Published on: January 26, 2016

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
10:27

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Published on: October 5, 2017

  • 证明了可逆和不可逆的电荷切换机制.
  • 结论:

    • 开发了多功能表面,可调节,pH值依赖的充电.
    • 证明了这些表面对控制静电相互作用的实用性.
    • 突出了自组装和表面修改中先进应用的潜力.