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Related Concept Videos

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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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.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Updated: Dec 13, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Surface polarization effects in confined polyelectrolyte solutions.

Debarshee Bagchi1, Trung Dac Nguyen2, Monica Olvera de la Cruz3,2,4

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.

Proceedings of the National Academy of Sciences of the United States of America
|August 5, 2020
PubMed
Summary
This summary is machine-generated.

Dielectric mismatch polarization significantly alters polyelectrolyte double-layer structure. This affects charge amplification and energy storage, influenced by polyelectrolyte flexibility and solvent quality.

Keywords:
confinementdielectric mismatchenergy storagenegative differential capacitancepolyelectrolytes

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Nanoscale interactions at interfaces with varying dielectric constants are vital for environmental, biological, and energy storage applications.
  • Understanding dielectric mismatch effects is key to controlling interfacial phenomena.

Purpose of the Study:

  • To investigate how polarization effects influence the double-layer structure of polyelectrolyte solutions confined between charged surfaces.
  • To explore the impact of dielectric mismatch on electrostatic potential, charge amplification, and energy storage.

Main Methods:

  • Theoretical analysis of polyelectrolyte solutions confined between charged surfaces.
  • Modeling of polarization effects due to dielectric mismatch.
  • Investigation of double-layer properties including electrostatic potential, differential capacitance, and energy storage.

Main Results:

  • Polarization effects decrease electrostatic potential with increasing surface charge density, indicating negative differential capacitance.
  • Electrostatic energy storage is enhanced by charge amplification in the presence of polarization.
  • Double-layer properties are sensitive to polyelectrolyte backbone flexibility and solvent quality.

Conclusions:

  • Dielectric mismatch polarization significantly impacts confined polyelectrolyte double-layer structure and properties.
  • The interplay of conformational entropy, Coulombic interactions, and surface repulsion governs these behaviors.
  • Findings offer insights for designing advanced energy storage devices and controlling interfacial processes.