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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
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Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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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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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
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Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

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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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Electric Field Lines01:25

Electric Field Lines

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The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
The solution to this problem is to use electric field lines, which are not vectors but...
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Induced Electric Fields01:23

Induced Electric Fields

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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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In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
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El desglose del campo eléctrico en las uniones de moléculas individuales.

Haixing Li1, Timothy A Su1, Vivian Zhang1

  • 1†Department of Applied Physics and Applied Mathematics and ‡Department of Chemistry, Columbia University, New York, New York 10027, United States.

Journal of the American Chemical Society
|February 13, 2015
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio revela cómo la estabilidad de las uniones moleculares se ve afectada por el sesgo de voltaje. Los enlaces covalentes son robustos, mientras que los enlaces donante-aceptante y los enlaces Si-Si/Ge-Ge se rompen bajo tensión, con el esqueleto Si-C mostrando la mayor estabilidad.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Química de las superficies.

Sus antecedentes:

  • Comprender la estabilidad de las uniones moleculares es crucial para la electrónica molecular.
  • El sesgo de alto voltaje puede inducir la ruptura en las uniones moleculares.
  • El papel de la columna vertebral molecular y los grupos de vinculación en la estabilidad de las uniones requiere una mayor investigación.

Objetivo del estudio:

  • Para investigar la estabilidad y ruptura de las uniones moleculares bajo un sesgo de alto voltaje a nivel de una sola molécula/un solo enlace.
  • Para determinar cómo la composición de la columna vertebral molecular (carbono, silicio, germanio) y los grupos de vinculación influyen en la ruptura de unión inducida por voltaje.
  • Establecer un nuevo método para estudiar los fenómenos de descomposición del campo eléctrico a escala de una sola molécula.

Principales métodos:

  • Utilizó la técnica de ruptura de unión basada en el microscopio de túnel de exploración.
  • Cables moleculares sintetizados a base de carbono, silicio y germanio con grupos de enlace aurófilos.
  • Probabilidad de ruptura de unión analizada como una función del sesgo de voltaje aplicado.

Principales resultados:

  • Las uniones con enlaces covalentes azufre-oro (S-Au) exhibieron una alta robustez y ninguna ruptura dependiente de sesgo.
  • Las uniones con bonos donante-aceptante se rompieron con más frecuencia y mostraron una fuerte dependencia de sesgo.
  • Aumento significativo de la probabilidad de ruptura por encima de ~1 V para los enlaces silicio-silicio (Si-Si) y germanio-germanio (Ge-Ge) en disilanos y digermanes terminados en metiltiol.
  • Las columnas vertebrales de silicio-carbono (Si-C) demostraron una mayor estabilidad bajo alta tensión en comparación con los enlaces silicio-silicio (Si-Si) y silicio-oxígeno (Si-O).

Conclusiones:

  • La estabilidad de las uniones moleculares bajo alta tensión depende en gran medida del tipo de enlace químico y de la columna vertebral molecular.
  • Los enlaces S-Au covalentes ofrecen una estabilidad superior, mientras que los enlaces donante-aceptante y homonucleares (Si-Si, Ge-Ge) son susceptibles a la ruptura inducida por voltaje.
  • Los enlaces Si-C proporcionan una mayor estabilidad en las uniones moleculares bajo campos eléctricos altos, ofreciendo potencial para dispositivos electrónicos moleculares robustos.