Abstract
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.
Highlights
The synthesis of magnetic nanoparticles has received a lot of attention because of their potential applications in various technological fields, as high-density magnetic recording devices [1] microwave devices [2], magnetic drug delivery [3], localized magnetic hyperthermia for tumor ablation in cancer treatment [4, 5]
The results obtained in this study indicated that the hydrothermal method assisted by microwave radiation was favorable for the synthesis of C oFe2O4
Cobalt ferrite nanocrystals with diameters ranging from 36 to 125 nm were prepared and their lattice parameters were in agreement with stoichiometric CoFe2O4 samples
Summary
The synthesis of magnetic nanoparticles has received a lot of attention because of their potential applications in various technological fields, as high-density magnetic recording devices [1] microwave devices [2], magnetic drug delivery [3], localized magnetic hyperthermia for tumor ablation in cancer treatment [4, 5]. The synthesis parameters can influence the crystallite size, degree of crystallinity and morphology of the particles These parameters are: synthesis temperature, pH value, reaction time, type and concentration of salts (iron chloride, iron sulfate, iron nitride), type and concentration of alkali (KOH, NaOH). The design of experiments (DOE) is a set of experimental assays used to statistically evaluate the effects of one or more variables on the response [36, 37]. It consists of an experiment-based model in which a systematic approach is used for data collection and analysis. The DOE provides the relationship between the parameters and responses, yields significant information and better explanation when compared to the OFAT method.
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