6 documents found, page 1 of 1
Degradação rápida de folhas de policarbonato
Lima, Francisco Marcone; Martins, Felipe Mota; Nascimento, João Paulo Costa do; Maia Júnior, Paulo Herbert França; Almeida, Ana Fabíola LeiteThe thermal degradation of polycarbonate sheets was made from water-sodium hydroxide solution by spray pyrolysis. It was created a vacuum within nozzle for provides the spray. The material, before and after of the thermal degradation, were characterized by photoluminescence spectroscopy, scanning electron microscopy and X-ray fluorescence. Polycarbonate sheets, before and after of the thermal degradation, when ...
Silicon dioxide extraction from cashew nut ashes
Martins, Felipe Mota; Alencar, Francisco Klayton Marques de; Freire, Francisco Nivaldo Aguiar; Sena, Aline Cosmo de; Rocha, Hélio Henrique BarbosaAfter the cashew nuts processing, the husks rich in silicon are used as fuel in boilers where they are burned at temperatures above 1000 °C. In this study, it was investigated a form of silicon extraction from the ashes taken from the boiler using a chemical route. At first, the ashes were bathed with an aqua regia solution (+ 3), then it were bathed with sulfuric acid (4) and taken to the oven at 600 °C for tw...
Análises bibliométricas aplicadas ao estudo da secagem solar de alimentos
Menezes, Victor Augusto Cavalcante Bezerra; Graça, Manuel Pedro Fernandes; Freire, Francisco Nivaldo Aguiar; Maia Júnior, Paulo Herbert FrançaAnálises bibliométricas são bastante úteis quando se deseja evidenciarrelações existentes entre diversas publicações que tratamde umdeterminado assunto(do mais abrangente ao mais específico).As análises podem ser de diversos tipos, tais como de citação e co-citação, easrelaçõespodem ser estabelecidas tendo como base unidades de análisetais comoautores, organizações (centros de pesquisa e universidades), países ...
Nanostructured titanium dioxide average size from alternative analysis of Scher...
Lima, Francisco Marcone; Martins, Felipe Mota; Maia Júnior, Paulo Herbert França; Almeida, Ana Fabíola Leite; Freire, Francisco Nivaldo AguiarThe materials sizing in nano-scale is a challenge to be overcome, because the size determined by various methods differ. In order to shed light about the nanomaterials sizing, a modified Scherrer's equation was applied to estimate more accurately the nanostructured titanium dioxide crystal size. The manufactured titanium dioxide-nanostructured powder with nominal average size about 21nm was used as the referenc...
Caracterização da eletrodeposição de filmes finos de CdTe sobre Pt em meio ácido
Sousa, José Hugo de Aguiar; Maia Júnior, Paulo Herbert França; Silva, Álvaro Neuton de Araújo; Lima, Francisco MarconeThe electrodeposition has been used for obtaining semiconductor materials; however, remain unclear the mechanisms involved in this process. Thus, this paper presents the research of this process, showing the characterization of electrodeposited CdTe on platinum substrate in acid solution. The deposition occurs from 0.0 V relative to the electrode Ag/AgCl KClsat with step activated control and diffusion. The thi...
Obtenção de um filme fino de FTO pela técnica de spray-pirólise e método sol-ge...
Maia Júnior, Paulo Herbert FrançaThe growing interest in the use of new materials and their applications for photovoltaic systems has been a constant concern of the scientific community in recent years. This work is primarily engaged in the collection, characterization and photoactivity testing photovoltaic solar cells made of thin SnO2 doped fluoride films, the films were deposited by the technique of "spray-pyrolysis" and the Sol-Gel method ...