Application of Forced Electrification for Preparation of Complex Particles

Abstract

The purposes of the present work are to describe the importance of the application of forced electrification on complex particle preparation and to develop new materials with multiple functions by combining two kinds of particles electrified reciprocally. This paper reports a preparation method and the positive temperature coefficient of resistivity (PTCR) characteristics of composites consisting of semiconductive BaTiO₃ particles and metallic indium powder.

The forced electrification technique was applied to a complex particle preparation process and confirmed to be effective as follows:

1. A vibrating cylindrical electrode can force-electrify metal, semiconductor and insulator particles with positive or negative charges.

2. When two kinds of particles electrified reciprocally are mixed in the same region at the same time, complex particles can be produced by the electrostatically attractive force working between them.

3. Indium-semiconductive BaTiO₃ complex particles made with this processing offer a new PTCR material which can be used in arbitrary shapes by simple packing. This behavior cannot be accomplished by the conventionally sintered PTCR materials.

Get full access to this article

View all access options for this article.

References

Dan, T. , M. Egashira , J. Kyono , H. Fudoji and N. Shinya . 1996. "Preparation of New PTCR Material by Particle Electrification Processing", Extended Abstracts of the 5th Symposium on Intelligent Materials & UK-Japan Seminar on Intelligent Materials, pp. 47-49., Soc. of Non-Traditional Technology Intelligent Materials Forum.

Shinya, N. , M. Egashira and H. Fudouzi . 1994. "Powder Particles Assembly Using Electron Beam for Creation of Multi-Functional Materials", Proc. of the 2nd International Conference on Intelligent Materials, Williamsburg, VA, Technomic Publishing Co., Inc., pp. 1142-1151.