Navegando por Assunto "Combustão"

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Estudo das propriedades morfológicas e estruturais de CuFe2O4 e CoFe2O4 sintetizadas pelo método de combustão
(2023-02-16) Brito, Aimée Giovanna Jerônimo de; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/3353638162487072
The study of advanced ceramic materials such as CuFe2O4 and CoFe2O4 has been, in recent years, of great interest, as it has a wide range of applications such as magneto-optical devices, contrast agent for magnetic resonance imaging, and spintronics. The objective is to evaluate the structural and morphological characteristics of CuFe2O4 and CoFe2O4 synthesized by the combustion method. For the preparation of CuFe2O4 and CoFe2O4, the reagents Copper II nitrate trihydrate PA, iron III nitrate nonahydrate PA, and Cobalt II nitrate (OSO) and Urea P.A as fuel. To carry out the combustion synthesis, two types of containers were used, the beaker and the silica crucible. Flame temperature analyzes were carried out during the analysis, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Electron Scattering Spectroscopy (EDS). The graphs of time versus average temperature showed that the flame temperatures and the reaction time of CuFe2O4 and CoFe2O4 for the silica crucible container were greater than the syntheses carried out in the beaker container. XRD showed that the synthesis of CuFe2O4 and CoFe2O4 achieved crystallinity and formed an cubic normal spinel phase. SEM showed larger particle size for CuFe2O4 (1 to 10 μm) and CoFe2O4 (1 to 5 μm) synthesized in the silica crucible. The electron EDS showed the composition of elements necessary for formation of the spinel phase of CuFe2O4 and CoFe2O4 produced in both containers. The synthesis of CuFe2O4 and CoFe2O4 by combustion reaction is reproducible for both analyzed containers.
Influência da taxa de aquecimento na produção do carvão da madeira de Eucalyptus spp
(2019-07-12) Interaminense, Pedro Paulo Barros; Braz, Rafael Leite; http://lattes.cnpq.br/7332493832361305; http://lattes.cnpq.br/7774231489365848
This work aims to evaluate two carbonization marches and the fresh material collected in a Eucalyptus stand, located in Araripina - PE, in the northeastern backlands, using several clones who being homogenized to evaluate the practices. The Eucalyptus' samples were transformed into chips and underwent a drying process in an oven regulated at 65ºC ± 5ºC for 48-72 hours, until they reached constant weight, obtaining the moisture content and bulk density. Part of the biomass was intended for immediate chemical analysis and to estimate the superior calorific value, and the rest was used to the carbonization process. The gravimetric yield, immediate chemical analysis, and estimation of the superior calorific value of the charcoal produced were determined. Regarding the immediate chemistry analysis, it was possible to observe the reduction of volatile material contents and increase of fixed carbon after the carbonization process. The estimated calorific value was 4357.35 kcal.kg-1 for the fresh sample and 7220.28 kcal.kg-1 for the first march and the second march, related to the charcoal, was 7265.15 kcal.kg-1. Thereby, the second gear is better to use as charcoal because it has a shorter carbonization time and it has the same quality when compared to the first gear for the variables used.
Proposta de um jogo didático intitulado Trilha do Fogo para o ensino de reação de combustão
(2021-03-09) Viana, Eugênio Santana; Batinga, Verônica Tavares Santos; http://lattes.cnpq.br/7759044153725982; http://lattes.cnpq.br/1530132254676601
This presents the development of a Didactic Game entitled "Fire trail" to approach the content of Combustion Reactions, aimed at students of the 1st year of high school, due to the need to plan and introduce ludic didactic strategies in Chemistry classes. This game consists of a questionnaire that aims to diagnose students' previous conceptions about combustion reaction and the steps that make up the didactic game based on theoretical criteria established in the literature, such as: cooperative, board and card games, rules set, puzzle, quiz game, accessories and roll and move. The aim of this game is to provide effective participation and student engagement, interaction between student-students and student-teacher, and the mediation of the teacher in the different moves for the collective construction of the chemical knowledge of combustion reaction.