Electrets In Engineering - Kestelman, Vladimir N.

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Résumé :
Recently a new sphere in materials science? has formed which subject is structure and properties of electret materials used in engineering, medicine, biotechnology and other branches. It is characterized by specific methods of experimental investigations based on recording charge transfer, polarization and depolarization of dielectrics and involves original techniques and physico-mathematical aids where notions that exist at the interface of several natural and technical sciences are concentrated. It embraces a vast area of applications mainly in engineering, instrument? making, electronics, medical technique, biotechnology, and etc., has a specialized technological base for electric polarization of dielectrics composed of uncommon technological methods, equipment and instrumentation. Apparently, future fundamental investigations in the domain of electret materials science are to be developed at the interface of computer of dielectrics. Elaboration of a simulation, physics and physical chemistry model for electric polarization of solid media with uneven charge density distribution, complicated by surface phenomena, outer electromagnetic, heat, chemical and other effects, presents a grave methodological problem. The simulation of structures in which polarization follows diffusion mechanism of chemically active molecules or their fragments, and the development of calculation methods for polarized charge relaxation and regularities of dielectric nonlinear properties, are the most urgent objectives of current research. Success in bioelectret effect studies is anticipated to result in profound widening of natural science knowledge.

Sommaire:
1. Electret effect and electric technologies.- 1.1. Polarization of dielectrics.- 1.2. Electret production and properties.- 1.3. Electric fields as referred to materials technology.- References.- 2. Traditional fields of electret application.- 2.1. Transducers.- 2.2. Energy sources.- 2.3. Filters.- 2.4. Information recording.- References.- 3. The principles of engineering electret materials development.- 3.1. Technological decisions.- 3.2. Operation problems.- 3.3. The problems of electret composite materials (ECM) development.- References.- 4. Electrets in anticorrosion technique.- 4.1. Electret charge effect on corrosion.- 4.2. Polymer coatings.- 4.3. Polymer films.- References.- 5. Electrets in friction joints.- 5.1. Physico-chemical processes at friction.- 5.2. Metal-polymer friction joints.- 5.3. Lubricants.- 5.4. Ceramics.- References.- 6. Electrets in sealing systems.- 6.1. Electret field effect on medium permeation.- 6.2. Electret seals.- 6.3. Hermetic coatings.- 6.4. Filtering materials.- References.- 7. Biological and medical applications of electrets.- 7.1. Electrets in biotechnology.- 7.2. Electret application in medicine.- References.- 8. Ecological and economic aspects of electret Application.- 8.1. Terms of electret charge preservation.- 8.2. Spontaneous electret effects.- 8.3. Electret materials and ecology.- 8.4. Economic aspects of electret application.- References.