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Susceptibility, Permittivity and Dielectric Constant01:26

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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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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Updated: Jul 12, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples.

Montgomery Baker-Fales1, José D Gutiérrez-Cano2, José M Catalá-Civera2

  • 1Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, Newark, DE, 19716, USA.

Scientific Reports
|October 24, 2023
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Summary

This study presents a simple benchtop method to measure the temperature-dependent dielectric permittivity of liquids at microwave frequencies. This new technique provides essential data for optimizing microwave-assisted chemical processes.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Physical Chemistry

Background:

  • Microwave (MW) heating is crucial for intensified and electrified chemical manufacturing.
  • Accurate dielectric permittivity data, essential for MW heating, is often unavailable due to limitations in current measurement techniques.
  • Temperature and pressure significantly influence dielectric properties, necessitating accessible measurement methods.

Purpose of the Study:

  • To develop a simple, benchtop approach for measuring temperature-dependent dielectric permittivity of liquid samples.
  • To provide accurate dielectric data near the 2.45 GHz industrial, medical, and scientific (ISM) frequency.
  • To facilitate the optimization of microwave-assisted chemical processes by providing accessible material property datasets.

Main Methods:

  • Utilized a modified bireentrant microwave measurement cavity.
  • Incorporated larger pressure- and temperature-capable vials for liquid sample analysis.
  • Measured dielectric permittivity for vapor pressures up to 7 bar across a range of temperatures.

Main Results:

  • Successfully deduced temperature-dependent permittivity for various liquids, including water, organic solvents, and hydrochloric acid solutions.
  • Validated the methodology against existing literature data, confirming its accuracy for materials with dielectric constants from 1 to 100.
  • Provided simple data-fitting models for practical application in chemical process design.

Conclusions:

  • The developed benchtop method offers a rapid and accurate way to obtain critical dielectric permittivity data for liquids.
  • This advancement addresses the lack of accessible datasets, supporting the broader adoption of microwave technology in chemical manufacturing.
  • The generated data and fitting models will aid researchers and engineers in designing and optimizing MW-assisted processes.