Abstract
The preparation of 70% CoFe2O4/30% SiO2(wt%) nanocomposites by sol-gel method using three short chain diols (1,2-ethanediol, 1,3-propanediol, and 1,4-butanediol) as chelators was studied. The Fourier transformed infrared spectra and X-ray diffraction patterns were used to confirm the formation of nanocomposites. The X-ray diffraction analysis showed that the chain length of the carboxylates embedded in the silica matrix influences the formation of crystallized cobalt ferrite as single phase at low temperatures. The influence of the methylene groups number in the precursors and annealing temperature on the nanocrystallite size was revealed. The stability of the obtained compounds was determined by calculation of thermodynamic parameters.
Highlights
During the last decades, the nanocomposites preparation techniques experienced a fast development as these materials have a wide range of applications [1,2,3,4]
The FT-IR spectra (Figure 1) for the gels dried at 40∘C show the presence of nitrates characterized by an intense band at 1384 cm−1, indicating that the redox reaction was not initiated at this temperature
The embedding of the reactants in the silica matrix followed by the redox reaction with formation of carboxylate type precursors and their thermal decomposition allowed the obtaining of 70% CoFe2O4/30% SiO2 nanocomposites
Summary
The nanocomposites preparation techniques experienced a fast development as these materials have a wide range of applications [1,2,3,4]. Cobalt ferrite based nanocomposites present unique physicochemical properties that make it an attractive material for catalysis, antenna rods, loading coils, magnetic data storage, sensors, ferrofluids, magnetooptic materials, energy conversion applications, and targeted drug delivery [1,2,3,4,5,6]. A high number of methods have been reported previously for the preparation of CoFe2O4 nanoparticles, including microemulsion, thermal decomposition, reverse micelles, coprecipitation, sol-gel, mechanical alloying, combustion, and hydrothermal, electrochemical procedures, and green synthesis [9,10,11,12,13,14,15,16,17,18]. The sol-gel technique followed by annealing is one of the simplest, most effective, and feasible routes to produce high purity, homogeneous, and crystalline nanoparticles [19,20,21]
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