G F Leal Ferreira
G. F. Leal Ferreira | |
|---|---|
| Residence | C.P. 369, Sao Carlos, SP, Brazil |
G F Leal Ferreira (Guilherme Fontes Leal Ferreira) is a Brazilian physicist associated with the Instituto de Física de São Carlos of the Universidade de São Paulo (USP) in São Carlos, São Paulo, Brazil. He is known for his research on electrets, dielectric materials and charge transport in polymers.
Biography
Leal Ferreira worked for many years in São Carlos, São Paulo, where the Instituto de Física de São Carlos (formerly the Instituto de Física e Química de São Carlos) of the Universidade de São Paulo developed one of Brazil's principal research traditions in dielectrics and electrets. He is counted among the Brazilian scientists formed under the influence of the physicist Bernhard Gross, the pioneer of electret research in Brazil, alongside such figures as Joaquim Costa Ribeiro, Sérgio Mascarenhas, Yvonne Mascarenhas and Roberto Faria.
Work
Leal Ferreira's research has centred on the physics of electrets and dielectrics: the storage and decay of electric charge in insulating materials, thermally stimulated currents and discharges, the effects of electron-beam irradiation on polymeric insulators, and models of charge transport in charged polymer films. Working with the polymer group at São Carlos, he collaborated extensively with Bernhard Gross and José Alberto Giacometti on the corona charging of polymer foils and on the interpretation of the resulting charging and discharge transients.
Publications
Selected co-authored papers include:
- B. Gross, J. A. Giacometti, G. F. Leal Ferreira and O. N. Oliveira Jr., "Conduction of polyvinylidene fluoride", Journal of Applied Physics.
- B. Gross, J. A. Giacometti and G. F. Leal Ferreira, "Constant schubweg for hole transport in corona charged fluorethylenepropylene", Applied Physics A 37, 89–94 (1985).