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Capacitor With A Dielectric

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...

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.

Dielectric Polarization in a Capacitor

Dielectric Polarization in a Capacitor

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...

Gauss's Law in Dielectrics

Gauss's Law in Dielectrics

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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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh

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Optically transparent, electrically conductive composite medium.

S Jin, T H Tiefel, R Wolfe

Science (New York, N.Y.)

|January 24, 1992

Summary

This summary is machine-generated.

Researchers developed a transparent, conductive material using aligned ferromagnetic spheres in polymer. This material is highly conductive in one direction and switchable with pressure, ideal for touch screens.

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Area of Science:

Materials Science
Nanotechnology
Polymer Science

Background:

Optically transparent and electrically conductive materials are crucial for advanced electronic devices.
Existing materials often face trade-offs between transparency, conductivity, and mechanical properties.
Developing novel composite structures is key to overcoming these limitations.

Purpose of the Study:

To develop a novel composite material with both optical transparency and directional electrical conductivity.
To investigate the pressure-induced electrical switchability of the material.
To explore the potential applications of this material in visual communication devices.

Main Methods:

Fabrication of a composite material by dispersing vertically aligned, laterally isolated chains of ferromagnetic spheres within a transparent polymer sheet.
Characterization of optical transmittance (achieving >90% incident light transmission).
Measurement of electrical conductivity, specifically in the thickness direction.
Testing of pressure-induced electrical switching behavior.

Main Results:

The composite material exhibits high optical transparency (>90% light transmission).
The material demonstrates highly directional electrical conductivity, primarily along the thickness direction.
The material shows on-off electrical switchability when a threshold pressure is applied.
The structure consists of preferentially arranged conductive paths formed by aligned ferromagnetic spheres.

Conclusions:

A novel optically transparent and electrically conductive composite material has been successfully developed.
The material's unique directional conductivity and pressure-switchable properties offer significant advantages.
Potential applications include advanced visual communication devices like touch-sensitive screens and write pads.