15 documents found, page 1 of 2
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...
Pani addition to improve contact between CdTe/CdS semiconductors
Júnior, Paulo Herbert França Maia; Almeida, Ana Fabíola Leite; Moreira, Raquele Lima; Teixera, Edwalder Silva; Nunes, Vanja FonteneleThis paper presents the study of the addition of the polyaniline polymer (PANI), at the junction of the cadmium telluride and cadmium sulfide (CdTe/CdS) layers in order to improve the contact between the layers, to decrease the air gap that limit the conversion photovoltaic. The morphology of CdS, CdTe and polyaniline (PANI) were characterized with multiple techniques including scanning electron microscopy (SEM...
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...
Uma revisão sobre as tecnologias de dessalinização térmica associadas a concent...
Portela, Lino Wagner Castelo Branco; Almeida, Ana Fabíola Leite; Barbosa, Erilson de Sousa; Cézar, Kleber LimaEste artigo apresenta uma revisão sobre asprincipaistecnologias de dessalinização térmica associadas a energia solar. O concentrador solar parabólico é uma tecnologia de aproveitamento de energia solar que consiste basicamente em aquecer um fluido de trabalho (água, óleos minerais ou sintéticos, ar) que está presente em umsistema, sendo então capaz de fornecer energia térmica. Quantos aos dessalinizadores térmi...
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...
Performance evaluation of titanium oxide deposited by electrophoresis in photoe...
Souza, Antonio Paulo Santos; Cavalcante, Natália Macêdo; Freire, Francisco Nivaldo Aguiar; Almeida, Ana Fabíola LeiteNanoparticles of TiO2 have been the main semiconductor applied in Dye-sensitized solar cells (DSSCs). In this work, solar cells were developed from the electrophoretic deposition of anatase titanium dioxide (TiO2) films on conductive glasses. The electrophoretic deposition was perfomed with a constant voltage of 80V for 2 minutes and, after drying, the films were sintered at three different temperatures: 450 °C...
Photoelectrodes with titanate nanotubes sensitized by mesoporphyrin derivative ...
Souza, Antonio Paulo Santos; Almeida, Ana Fabíola Leite; Conegero, Leila de Souza; Viana, Bartolomeu Cruz; Ferreira, Odair PastorTitanate nanotubes (TiNTs) with the chemical composition Na2Ti3O7.nH2O (NaTiNT) were obtained through a hydrothermal method in highly alkaline medium. Protonated titanates nanotubes (H-TiNTs), with the composition H2Ti3O7.nH2O, were prepared by ion exchange reaction through a suspension of Na2Ti3O7nH2O nanotubes in HCl medium, promoting the exchange of Na+ ions by H+. Both Na2Ti3O7.nH2O and H2Ti3O7.nH2O produc...