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Electro-active electret transducers, and on ferroelectret and composite-electret sensors

Grant number: 16/24832-3
Support type:Research Grants - Visiting Researcher Grant - International
Duration: January 02, 2017 - January 15, 2017
Field of knowledge:Engineering - Electrical Engineering - Electrical Materials
Principal Investigator:Ruy Alberto Corrêa Altafim
Grantee:Ruy Alberto Corrêa Altafim
Visiting researcher: Georg Reimund Gerhard
Visiting researcher institution: University of Potsdam, Germany
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


The topic of the visiting project will be the combination of mechanical, electrical and thermal effects on the behavior of electro-active electret transducers in general, and on ferroelectret and composite-electret sensors in particular. Usually, only the electro-mechanical (or piezoelectrical) domain is investigated and utilized for electro-mechanical transducers and the electro-thermal (or pyroelectrical) domain for pyroelectric sensors and electrocaloric devices. However, from fundamental thermodynamical considerations and from the real properties of the relevant materials, it is clear that all three domains may be of comparable importance. Therefore, a holistic view will be beneficial for real-world applications. Consequently, thermal stimulation will be used to better characterize the electro-mechanical behavior and the stability of ferroelectret and other electret sensors, and new experiments and evaluation methods will be developed and initiated. (AU)