Produção Nacional
Revisado por pares
Átila Pereira Timbó, Paulo Victor Ferreira Pinto, Hilton Andrade Pinho, Lucas Pinheiro de Moura, Jécol Bamutsha Chretien, Flávio Wanderley Viana, Rogério Guerra Diógenes Filho, Erandir Brasil da Silva, Marcos Erick Rodrigues da Silva, José Wally Mendonça Menezes, Glendo de Freitas Guimarães, W. B. Fraga,
This paper presents an optical sensor for pH measurement based on thin film applied onto a silica substrate. The thin films were prepared through the sol–gel process, by using bromocresol purple (BCP) as photoresist indicator by means of hydrolysis and acid catalyzed reaction of tetraethylorthosilicate (TEOS) with the surfactant sodiumdodecylsulfate (SDS). As for the excitation light source, we used the wavelength of 470 nm, and we measured the fluorescence response by using three optical filters: ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2015 - Elsevier BV | Sensors and Actuators B Chemical
Produção Nacional
Revisado por pares
N.A.S. Nogueira, Erandir Brasil da Silva, P.M. Jardim, J. M. Sasaki,
Nanoparticles of NiAl2O4 were synthesized by heating (500–1000 °C) the dried resin resultant of a mixture in aqueous solution of gelatin, NiCl2·6H2O and AlCl3·6H2O. The particle size and microstrain were calculated from the line broadening of X-ray powder diffraction peaks through the Rietveld method refinement: these are 3.9–16 nm and − 0.743–0.139%, respectively. The NiAl2O4 nanoparticles were characterized by X-ray powder diffraction (XRPD), thermo gravimetric analysis (TG), BET and TEM techniques.
Tópico(s): Advanced ceramic materials synthesis
2007 - Elsevier BV | Materials Letters
Produção Nacional
Revisado por pares
Edilan Lima, Luelc Souza da Costa, Gabrielle R. L. M. Sampaio, Edipo S. Oliveira, Erandir Silva, Hélio Oliveira do Nascimento, Ronaldo Ferreira do Nascimento, Karine Oliveira Moura, Moisés Bastos-Neto, Adonay R. Loiola, J. M. Sasaki,
Coprecipitation is one of the most practical methods used to synthesize ferrite nanoparticles.Fine characteristics of these materials can be improved by means of a series of modifications in the synthesis method.In this paper we present a study of influence of glycerol as structure directing and stabilizing agent in the synthesis of zinc ferrite nanoparticle, exploring its chelating capacity and oxidation.The studied materials include two series of zinc ferrite samples and its precursors obtained ...
Tópico(s): Magnetic Properties and Synthesis of Ferrites
2018 - Brazilian Chemical Society | Journal of the Brazilian Chemical Society
Erandir Brasil Silva, Paulo Pinto, Jécol Bamutsha Chretien, João Isaac Silva Miranda, Hilton Andrade Pinho, Átila Pereira Timbó, W. B. Fraga, José Wally Mendonça Menezes, Marcos Erick Rodrigues da Silva, Glendo de Freitas Guimarãres,
In this study, we present the development of a green and high-sensitivity optical dissolved oxygen (DO) sensor for measuring DO in water using spectrofluorimetry. For the development of the sensor element, an organometallic complex was synthesized from the "chlorophyll A" molecule, extracted from the plant Brassica oleracea L., with zinc insertion (Zn+2) replacing the magnesium (Mg+2). In the investigation, we evaluated the fluorescence suppression of the organometallic zinc complex for samples with ...
Tópico(s): Analytical chemistry methods development
2017 - Optica Publishing Group | Applied Optics
Produção Nacional
Revisado por pares
André de Oliveira Girão Maia, Francisco G.S. Oliveira, Carlos Henrique Nascimento Cordeiro, Edwalder Silva Teixeira, Erandir Brasil da Silva, J.M. Soares, Igor F. Vasconcelos, J. M. Sasaki, T. Dumelow,
Tópico(s): Pigment Synthesis and Properties
2021 - Springer Science+Business Media | Journal of Sol-Gel Science and Technology
Produção Nacional
Revisado por pares
Erandir Brasil da Silva, Antoninho Valentini,
OF METHYLENE BLUE.Solid samples containing a Ca 2 Fe 2 O 5 phase were synthesized using the Pechini method.The samples were characterized using X-ray diffraction, thermogravimetric analysis, differential thermal analysis, X-ray fluorescence, nitrogen adsorption/desorption isotherms, and scanning electron microscopy.The stability of the Ca 2 Fe 2 O 5 phase was evaluated in the photocatalytic degradation of methylene blue (MB) in aqueous solution in the presence of bubbling gas (air, N 2 , or CO 2 ).The ...
Tópico(s): Pigment Synthesis and Properties
2015 - Brazilian Chemical Society | Química Nova