9 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 ...
Modelo teórico relacionando as potências elétrica e química em célula fotossens...
Lima, Francisco Marcone; Bezerra, Karine Pereira; Marques, Maria Katiane Diógenes; Júnior, Paulo Herbert França Maia; Freire, Francisco Nivaldo AguiarThis paper presents a theoretical model relating the electrical power to the chemical power in a photosensitized dye-cell. The same is based on the junction of present concepts of chemical potential models and chemical power. Thus, from these two considerations is possible to perform tests under various physical and environmental conditions during the solar conversion process. Consequently, the proposed theoret...
Building and testing a spin coater for the deposition of thin films on DSSCs
Teixeira, Edwalder Silva; Cavalcanti, Raphael Coelho; Nunes, Vanja Fontenele; Júnior, Paulo Herbert França Maia; Lima, Francisco MarconeA low cost spin coater was constructed in this work for the deposition of thin films of titanium dioxide (TiO2) on conductive substrate of FTO (fluoride doped tin oxide) with application on dye sensitized solar cells. The results showed a 95% precision between the speed values obtained by the software of C#sharp language and the spin values observed directly on the device. The TiO2 films deposited through the s...
Use of SnOx: F in the Recycling of Silicon Solar Cells
Lima, Francisco Marcone; Alves, Jean Faber Araújo; Júnior, Paulo Herbert França Maia; Martins, Felipe Mota; Teixeira, Edwalder SilvaAmongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the...
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...
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...
Preparação e caracterização de filmes condutores: óxidos de estanho e cobre par...
Lima, Francisco MarconeThe transparent conductor oxide films are a class important of materials because exhibit both transparency and electronic conductivity simultaneously. Although a large number of works on preparation using acid and characterization on that materials have seen reported over the years, but there seems not a single work on the theme. In the present work was developed a systematic process for the preparation of tran...
Deposição de dióxido de estanho-flúor (SnO2:F) em substrato transparente para u...
Lima, Francisco MarconeThe conductor glasses have been used as transparent conductor oxides (TCO’s). Due to its transmittance in the visible spectrum and low sheet resistance, TCO’s have been employed as a constituent component of photoeletrochemical cells activated with dye. This work is dedicated to the conductor glass fabrication, at a lab scale, on 2,6 cm x 7,6 cm glass substrates by spray pyrolyris method and application of the ...