Charge storage in electret polymers [Elektronische Ressource] : mechanisms, characterization and applications / vorgelegt von Axel Mellinger

Axelmellinger

Description

Charge Storage in Electret Polymers:Mechanisms, Characterization andApplicationsHabilitationsschrift zur Erlangung des akademischen Gradesdoctor rerum naturalium habilitatus(Dr. rer. nat. habil.)der Mathematisch-Naturwissenschaftlichen Fakult atder Universit at Potsdamvorgelegt vonDr. Axel Mellingergeb. am 25. August 1967 in Munc henPotsdam, 06. Dezember 2004®iiiAbstractElectrets are materials capable of storing oriented dipoles or an electric surplus charge for longperiods of time. The term “electret” was coined by Oliver Heaviside in analogy to thewell-known word “magnet”. Initially regarded as a mere scienti c curiosity, electrets becamethincreasingly imporant for applications during the second half of the 20 century. The mostfamousexampleistheelectretcondensermicrophone, developedin1962bySesslerandWest.Today, these devices are produced in annual quantities of more than 1 billion, and have becomeindispensable in modern communications technology.Eventhoughspace-chargeelectretsarewidelyusedintransducerapplications,relativelylittlewas known about the microscopic mechanisms of charge storage. It was generally accepted thatthe surplus charges are stored in some form of physical or chemical traps. However, trap depthsof less than 2 eV, obtained via thermally stimulated discharge experiments, con icted with theobserved lifetimes (extrapolations of experimental data yielded more than 100000 years).

Sujets

• Physik

Informations

• Publié par: universitat_potsdam
• Publié le: 01 janvier 2005
• Nombre de lectures: 12
• Langue: English
• Poids de l'ouvrage: 5 Mo

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