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Master's Dissertation
DOI
10.11606/D.54.1983.tde-21102009-102441
Document
Author
Full name
Makoto Yoshida
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1983
Supervisor
Title in Portuguese
Montagem da técnica de pulso térmico e sua aplicação ao estudo da evolução de cargas termicamente ativadas da superfície.
Keywords in Portuguese
Armadilhas
Centróide de carga
Corrente termoestimulada
Potencial de superfície
Pulso térmico
Abstract in Portuguese
É apresentada neste trabalho a Técnica de Pulso Térmico com os aspectos teóricos envolvidos e a montagem do sistema experimental. A técnica é destinada à determinação do potencial de superfície, centróide de carga e carga total em filmes de polímeros. A técnica foi aplicada em conjunto com a de descarga termo estimulada em "circuito-aberto'' ao estudo das propriedades de transporte e armazenamento de cargas em filmes de Teflon FEP (25?m) em diferentes situações: amostras virgens, tratadas termicamente, submetidas a radiação ultra violeta e amostras submetidas à descarga iônica a baixa pressão. Vários problemas foram levantados e alguns deles abordados segundo modelos teóricos simplificados na interpretação dos dados experimentais.
Title in English
The heat pulse technique and its application to the study of the evolution of thermally stimulated charges from the surface.
Keywords in English
Charge centroid
Heat pulse
Surface potential
Traps
TSC
Abstract in English
Theoretical experimental aspects of the Heat Pulse Technique (HPT) are presented. The applications were the measurements of surface potentials, charge centroid, and total charge of the film samples. No tentative was made to determinate the spatial distribution of the observed charges. The HPT was used as complement of TSC open circuits measurements in the study of conduction and polarization effects in 25?m Teflon FEP films for different initial conditions of the corona-charged samples: virgin samples, annealed, u.v. irradiated, and samples submitted to ionic glow discharge. Several problems were raised and some of them were treated using very simple theoretical models to interpret the experimental results.
 
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MakotoYoshidaM.pdf (4.58 Mbytes)
Publishing Date
2009-10-23
 
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