Navegando por Autor "Torres, M. M."

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Influence of reaction temperature, proportions of iron, cobalt and KOH on the CoFe2O4 synthesis by hydrothermal method assisted by microwave heating
(Springer, 2017-06-19) Paskocimas, Carlos Alberto; Conceição, Ozivam Lopes de Aquino; Garcia, Laurênia Martins Pereira; Lovisa, Laura Ximena; Torres, M. M.; Soares, J. M.; Delmonte, Maurício Roberto Bomio; Motta, Fabiana Villela da
In this study, several factors such as reaction temperature, proportions of iron, cobalt and KOH were considered in the synthesis of cobalt ferrite nanoparticles by hydrothermal method assisted by microwave radiation. These parameters were studied using the full factorial experiment design. The effect of these factors on crystallite size was investigated using surface response methodology. The structure, crystallite size, magnetic properties, degree of inversion, as well as the chemical occupation of Fe ions were investigated in this study. The results indicated that all factors were statistically significant by analysis of variance (F-test), with a confidence level of 95%. The factors that influenced the growth of the crystallite were: KOH and iron concentration, precursors of cobalt salts and the effect of the interaction between the concentration of KOH and the concentration of precursors. The analysis of variance at a significance level of 95% indicates that the model adjusted to the experimental points is significant

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