22 documents found, page 1 of 3
Zinc ferrite nanoparticles via coprecipitation modified method: glycerol as str...
Lima, Edilan Silva; Costa, Luelc Souza da; Sampaio, Gabrielle R. L. M.; Oliveira, Edipo S.; Silva, Erandir B.; Nascimento, Hélio O.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. Th...
Lateritas do Domínio Médio Coreaú - comportamento geoquímico de mantos lateríti...
Siqueira, Ana Cláudia de Abreu; Magini, Christiano; Dantas, Elton Luis; Fuck, Reinhardt Adolf; Sasaki, José MarcosIn this paper an evaluation is made over the geochemistry signature of major elements in lateritic rocks on the counties of Granja, Martinópole and Parazinho, Northwest of Ceará State. Geologically, the area is located in Médio Coreaú Domain, characterized by the Granja Complex, which is the geological basement of the region, composed by gneiss, granulites and migmatites, and supracrustal sequences formed by qu...
Análise química preliminar da sujidade depositada em duas plantas fotovoltaicas...
Araújo, Danielly Norberto; Freitas Filho, Marcelo Ferreira; Carvalho, Paulo Cesar Marques de; Sasaki, José MarcosSujidade é um dos parâmetros ambientais que mais afeta o desempenho de módulos Fotovoltaicos (FV), sendo apenas menos relevante do que a irradiação solar e a temperatura. A redução do desempenho FV devido à sujidade é influenciada não apenas pela quantidade acumulada de sujeira, mas também por sua composição física e química. As características química e física da sujidade depositada são específicas do local/mó...
Análise da composição físico-química da sujidade de plantas fotovoltaicas: estu...
Freitas Filho, Marcelo Ferreira; Araújo, Danielly Norberto; Carvalho, Paulo Cesar Marques de; Sasaki, José MarcosWith the growth of the Photovoltaic (PV) sector, studies that seek to increase the efficiency of PV modules and analyze the factors that impact their performance have been intensifying. Soiling is one of the parameters that negatively interferes with the performance of the modules, whose impact depends not only on the amount of accumulated soiling, but also on the chemical and physical composition of the dirt. ...
Estudo sobre a utilização do rejeito de granito rosa Iracema como matéria-prima...
Lobo, Cândido Jorge de Sousa; Nogueira, Ricardo Emílio Ferreira Quevedo; Argonz, Raquel; Sasaki, José Marcos; Sales, Juscelino ChavesThe spinning navel is a component widely used in the textile industry. Such navels are basicaly alumina or high-alumina ceramic parts, and since they are not produced in Brazil, they are imported at high costs. For this reason, an alternative material for the fabricationof hte navel was proposed, consisting of granite powders.Since granites are basically silicates and exhibit lower mechanical strength and hardn...
Estudo sobre a utilização do rejeito de granito rosa Iracema como matéria-prima...
Lobo, Cândido Jorge de Sousa; Nogueira, Ricardo Emílio Ferreira Quevedo; Argonz, Raquel; Sasaki, José Marcos; Sales, Juscelino ChavesIn this work, physical properties of sintered compacts made from granite powder reinforced with alumina particles were determined. This composite is proposed as an economic alternative to the more expensive pure alumina, currently used in the fabrication of spinning navels for the textile industry. The composite material was compared to the materials from some spinning navels currently in use in a textile plant...
Síntese de nanopartículas de óxido de cromo a partir do método Sol-gel protéico
Medeiros, Angela Maria de Lemos; Silva, Erandir Brasil da; Flores, Wladimir Hernandes; Sasaki, José MarcosA first motivation for the development of materials in the nanometric scale is associated to the possibility that a larger number of them comes to be gathered in devices of very small dimensions, increasing miniaturization and capacity for processing information. This research reside in the fact that new and uncommon physical and chemical properties, absent in the same material in macro and microscopic size, ar...
Utilização da borra do alumínio como matéria-prima para a produção de cerâmicas.
Mota, Rejane Carneiro; Argonz, Raquel; Nogueira, Ricardo Emílio Ferreira Quevedo; Sasaki, José Marcos; Oliveira, Leonardo Rodrigues deDuring the production of aluminium, a residue called dross is produced, which contains oxides. This residue can be used for the production of cement and refractories. Aluminium drosses, when not inertized, are dangerous to human health and may contamine the environment. In this work, aluminium dross was milled and classified by sieving. Powders obtained were pressed into bars and sintered at 1400ºC for 1h with ...
Produção de cerâmicas refratárias utilizando a borra do alumínio com diferentes...
Mota, Rejane Carneiro; Argonz, Raquel; Nogueira, Ricardo Emílio Ferreira Quevedo; Sasaki, José Marcos; Oliveira, Leonardo Rodrigues deAluminum dross, a by-product from the production of aluminum, contains a large amount of high-melting point oxides which make it a potential candidate for a refractory material. In order to improve the mechanical properties of this material, different amounts of mullite ( 0 to 35 wt%) were added. The mixtures obtained were pressed into bars and sintered at 1400ºC for 1h. The pyrometric cone equivalent (PCE) was...
Utilização do rejeito do granito Rain Forest como matéria prima alternativa par...
Cabral, Daniel Henrique Pires; Nogueira, Ricardo Emílio Ferreira Quevedo; Sasaki, José Marcos; Argonz, RaquelThis work describes a study on the technical viability of using Rain Forest granite rejects as an alternative raw material for the fabrication of ceramic tiles with low water absorption. The aim is to employ these tiles in the construction industry, thereby reducing the environmental impact of granite residues and minimizing fabrication costs. Initially the rejects were milled and sieved. A small amount of wate...