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Van der Waals Interactions01:24

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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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From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the four fundamental forces of nature. It has been known to humanity in various forms for thousands of years. For example, the ancient Greek philosopher Thales of Miletus recorded his experiments on static electricity using amber and fur in the sixth century BC.
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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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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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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.
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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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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Electrostatic interactions between rough dielectric particles.

Matthew Gorman1, Xuan Ruan1, Rui Ni1

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review. E
|April 18, 2024
PubMed
Summary
This summary is machine-generated.

Particle roughness and orientation significantly impact electrostatic forces, especially at close distances. Charge accumulation on surface bumps weakens interactions, affecting particle aggregation in processes like protoplanetary formation.

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Area of Science:

  • Physics
  • Astrophysics
  • Materials Science

Background:

  • Electrostatic forces drive particle aggregation in various systems, from colloids to protoplanetary disks.
  • Research has primarily focused on spherical particles, leaving interactions of nonspherical and rough particles less understood.

Purpose of the Study:

  • To investigate how surface roughness and charge distribution affect electrostatic interactions between nonspherical dielectric particles.
  • To quantify the influence of particle orientation and surface features on inter-particle forces.

Main Methods:

  • A boundary-element method model was employed to simulate electrostatic interactions.
  • Analysis focused on charge accumulation at surface asperities and near-contact regions.
  • A correction factor (ΔF) was introduced for higher-order dielectric effects.

Main Results:

  • Charge accumulation on convex surface asperities reduces electrostatic interaction strength.
  • Particle roughness and orientation significantly influence electrostatic forces, particularly at small separations.
  • Near-contact interactions were found to be critical in determining the net electrostatic force.

Conclusions:

  • Surface topography and charge distribution asymmetry play crucial roles in particle interactions.
  • Findings have implications for understanding triboelectrification and particle aggregation in astrophysical and material contexts.