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Related Concept Videos

Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

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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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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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Related Experiment Video

Updated: Dec 2, 2025

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Assessing Changes in Dielectric Properties Due to Nanomaterials Using a Two-Port Microwave System.

Mohammed Rahman1, Rachita Lahri1, Syed Ahsan2

  • 1Institute of Pharmaceutical Sciences, King's College London, Strand, London WC2R 2LS, UK.

Sensors (Basel, Switzerland)
|November 4, 2020
PubMed
Summary

This study evaluates how nanoparticles enhance microwave signals for cancer detection. Carbon nanotubes and salt solutions were tested, showing potential for screening contrast-enhancing materials in microwave systems.

Keywords:
contrast enhancementmicrowave imagingnanoparticles

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Electromagnetics

Background:

  • Dielectric property changes in tissues at microwave frequencies offer potential for cost-effective cancer detection.
  • Nanoparticles (NPs) with high dielectric constants and tumor uptake can enhance these detectable changes.
  • Carbon nanotubes (CNTs) are explored for their high microwave dielectric contrast properties.

Purpose of the Study:

  • To assess the impact of contrast enhancement on microwave signals using a two-port experimental setup.
  • To investigate multiwall carbon nanotubes (MWNT) and functionalized MWNT-OH as contrast-enhancing NPs in tissue phantoms.
  • To evaluate salt (NaCl) solutions as reliable reference mixtures for inducing dielectric contrast changes.

Main Methods:

  • Characterization of MWNT and MWNT-OH using atomic force microscopy.
  • Measurement of dielectric properties of NPs dispersed in 60% glycerol-water mixtures.
  • Study of salt concentrations in glycerol mixtures to induce dielectric contrast.
  • Evaluation of contrast enhancement using a simplified two-port microwave system.
  • Comparison of experimental findings with numerical simulations.

Main Results:

  • Dielectric properties of MWNT and MWNT-OH were measured in glycerol-water mixtures.
  • Salt solutions reliably induced measurable dielectric contrast changes.
  • The two-port microwave system demonstrated the impact of dielectric contrast on microwave signals.
  • Experimental results were corroborated by numerical simulations.

Conclusions:

  • The presented approach is a reliable method for screening contrast-enhancing materials.
  • The study validates the use of microwave systems for detecting the impact of contrast agents.
  • This technique shows promise for developing simple and cost-effective cancer detection tools.