Bernhard Gross and the evolution of modern electret research

Sessler, G. M.

doi:10.1590/s0103-97331999000200003

Cited by 13 publications

(10 citation statements)

References 2 publications

(2 reference statements)

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“…By irradiating electrets with ionizing radiation, ions and/or electrons are produced in the surrounding gas and are attracted to the electret fibres and reduce the surface charge. Electrons and/or electron holes, which are produced inside the electret during the irradiation, also contribute to the reduction of the surface charge [ 12 , 13 ]. Polypropylene, which is usually used in FFRs, obtains its surface charge during the melt-blowing or melt-spinning process due to the trapping of charge carriers at defects during the manufacturing process [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Sterilization of polypropylene membranes of facepiece respirators by ionizing radiation

Pirker

Krajnc

Malec

et al. 2021

Journal of Membrane Science

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: Ionizing radiation has been identified as an option for sterilization of disposable filtering facepiece respirators in situations where the production of the respirators cannot keep up with demand. Gamma radiation and high energy electrons penetrate deeply into the material and can be used to sterilize large batches of masks within a short time period. In relation to reports that sterilization by ionizing radiation reduces filtration efficiency of polypropylene membrane filters on account of static charge loss, we have demonstrated that both gamma and electron beam irradiation can be used for sterilization, provided that the respirators are recharged afterwards.

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Section: Introductionmentioning

confidence: 99%

Sterilization of polypropylene membranes of facepiece respirators by ionizing radiation

Pirker

Krajnc

Malec

et al. 2021

Journal of Membrane Science

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“…He was one of the key players in the development of Physics in Brazil. His students and collaborators often acknowledged the important influence of Gross and his contribution to the development of Physics, as can be found in the words of some of his many students and colleagues, S. Mascarenhas [13] and G. M. Sessler [14]. It is also interesting to follow Gross' own testimony in an interview for a project on the History of Sciences in Brazil [15].…”

Section: The Beginning: the Pioneers (1934-1949)mentioning

confidence: 99%

CR Physics in Brazil

Dobrigkeit¹

2011

Proceedings of 4th School on Cosmic Rays and Astrophysics — PoS(CRA School)

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Cosmic rays have long been a topic of intense research activities in Brazil. Due to the contagious enthusiasm and excellence of the men who introduced this field in the country around 1930, a tradition in cosmic ray physics was built and over the past eighty years there have always been one or more groups of scientists dedicating their efforts building detectors, performing experiments and obtaining top results in this research area. Although many physicists spent their lives working in cosmic ray physics in Brazil, one must acknowledge the enormous contribution of Gleb Wataghin and Cesar Lattes to making this one of Brazil's most traditional areas of research in Physics. Wataghin and Lattes are the main protagonists of the story of cosmic ray physics in Brazil.

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“…During the last few years, many experimental methods have been developed for the understanding of charge trapping and 4 Author to whom any correspondence should be addressed. relaxation phenomena in insulators [1][2][3]. These techniques are often two step methods wherein the measurement of the trapped charges starts at the end of the irradiation so that they do not allow a dynamic investigation of the charging and discharging processes.…”

Section: Introductionmentioning

confidence: 99%

Charging effects of PET under electron beam irradiation in a SEM

Jbara¹,

Fakhfakh²,

Belhaj³

et al. 2008

J. Phys. D: Appl. Phys.

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This paper deals with charge trapping and charge transport of polyethylene terephthalate (PET) polymer subjected to electron irradiation in a scanning electron microscope (SEM). Measurement of displacement current and leakage current using an arrangement adapted to the SEM allows the amount of trapped charge during and after electron irradiation to be determined and the charge mechanisms regulation to be studied. These mechanisms involve several parameters related to the electronic injection, the characteristics of insulator and the effects of the trapped charge itself. The dynamic trapping properties of PET samples are investigated and the time constants of charging are evaluated for various conditions of irradiation. The determination of the trapping cross section for electrons is possible by using the trapping rate at the onset of irradiation.Many physical processes are involved in the charging and discharging mechanisms; among them surface conduction is outlined. Through the control of irradiation conditions, various types of surface discharging (flashover phenomenon) behaviour are also observed. The strength of the electric field initiating surface discharge is estimated.

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Bernhard Gross and the evolution of modern electret research

Cited by 13 publications

References 2 publications

Sterilization of polypropylene membranes of facepiece respirators by ionizing radiation

Sterilization of polypropylene membranes of facepiece respirators by ionizing radiation

CR Physics in Brazil

Charging effects of PET under electron beam irradiation in a SEM

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