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- Title
History and recent progress in ferroelectrets produced in Brazil.
- Authors
Altafim, Ruy Alberto Pisani; Altafim, Ruy Alberto Corrêa
- Abstract
More than 30 years ago, a group of researchers in Tampere–Finland developed a thin foamed polymeric material for capacitive sensors. Such soft-voided films exhibited electrical charging characteristics, forming a powerful combination, which resulted in a smart-material with ferroelectric properties. The discovery of the electro-thermo mechanical film (ETMF) has sparked the curiosity of the electret community, leading to the development of several studies. At that time, ETMF became known as cellular electrets and, later, as ferroelectrets or piezoelectrets regarding their electromechanical properties. This paper provides a timeline review of the research on ferroelectrets produced in Brazil, between the years 1990 and 2020, towards demonstrating how the interest in the electret electrical charging mechanism has resulted in the use of ferroelectrets with well-controlled cavities for ultrasound applications.
- Subjects
BRAZIL; TAMPERE (Finland); FINLAND; FOAMED materials; LITERATURE reviews; CAPACITIVE sensors; ELECTRETS; ELECTRIC charge; RESEARCH personnel
- Publication
Journal of Advanced Dielectrics, 2023, Vol 13, Issue 4, p1
- ISSN
2010-135X
- Publication type
Article
- DOI
10.1142/S2010135X23410072