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Related Concept Videos

Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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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 permittivity....
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Van der Waals Interactions01:24

Van der Waals Interactions

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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.
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Electric Field of a Non Uniformly Charged Sphere01:22

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Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
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Updated: Dec 30, 2025

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Electrostatic interactions between spheroidal dielectric particles.

Ivan N Derbenev1, Anatoly V Filippov2, Anthony J Stace1

  • 1School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.

The Journal of Chemical Physics
|January 17, 2020
PubMed
Summary
This summary is machine-generated.

Electrostatic interactions between charged polarizable dielectric spheroids are modeled. The theory reveals how particle shape influences attraction and repulsion, crucial for understanding self-assembly.

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Area of Science:

  • Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Electrostatic interactions are fundamental in colloid science and materials self-assembly.
  • Understanding interactions between non-spherical particles is complex but critical for predicting behavior.

Purpose of the Study:

  • To develop a theoretical framework for electrostatic interactions between charged polarizable dielectric spheroids.
  • To investigate the influence of particle shape on electrostatic forces and self-assembly.

Main Methods:

  • Formulating electrostatic force as a surface integral dependent on particle dimensions, charge, dielectric properties, and separation.
  • Analyzing the switching behavior between repulsion and attraction based on spheroid axial ratios.

Main Results:

  • The theory accurately describes forces for spheroids, reducing to spherical particle solutions when axes are equal.
  • Demonstrated shape-dependent switching between attraction and repulsion.
  • Extended to limiting cases for nonpolarizable spheroids (rods, discs, point charges).

Conclusions:

  • The developed theory provides a comprehensive understanding of electrostatic interactions for dielectric spheroids.
  • This work is vital for elucidating mechanisms in electrostatically driven self-assembly processes.