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相关概念视频

Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Induced Electric Dipoles01:28

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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.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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...
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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...
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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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定向电场─通用催化剂

Sason Shaik1, David Danovich1, Surajit Kalita1

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.

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概括
此摘要是机器生成的。

定向外部电场 (OEEF) 作为通用试剂,控制化学反应和分子结构. 这些领域在特定的反应轴上降低了能量障碍,使得新的合成可能性和应用成为可能.

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科学领域:

  • 物理化学 物理化学
  • 有机化学 有机化学
  • 超分子化学 超分子化学

背景情况:

  • 外部电场可以影响化学反应和选择性.
  • 了解电场介导化学原理对于新型合成策略至关重要.

研究的目的:

  • 概述导向外部电场 (OEEF) 在控制化学转换中的原理.
  • 证明OEEFs是可以降低能源障碍和直接反应通路的通用试剂.
  • 探索OEEF在各种化学过程中的应用,包括溶液和结构变化的化学过程.

主要方法:

  • 理论计算和实验观察OEEF对化学反应的影响.
  • 在反应轴 (RA) 上降低能量屏障的分析.
  • 研究OEEF诱导的结构变化和溶剂中的催化作用.

主要成果:

  • OEEFs在定义的反应轴上独特地降低能量障碍,充当分子笔.
  • OEEF催化了极性溶剂中的反应,证明了不完美的溶剂选和超出气体/固体阶段的适用性.
  • 使用OEEF的连续流设置显示了扩大产品产量的潜力.
  • 对OEEF/热二分法的证据表明,OEEF诱导的产品可能与热制造的产品不同.
  • 在1GHz以下的振荡电场对分解斑块最有效.

结论:

  • OEEF是化学变化的通用增强剂,适用于反应和结构转换.
  • 概述的原则为预测和利用OEEF效应提供了一个框架.
  • 组织化学培训机构 (OEEF) 准备彻底改变化学教育,实践和分子合成.