Development of cobalt ferrite powder preparation employing the sol–gel technique and its structural characterization

Sajjia, M.; Oubaha, Mohamed; Prescott, Tim; Olabi, Abdul–Ghani

doi:10.1016/j.jallcom.2010.07.015

Cited by 98 publications

(28 citation statements)

References 27 publications

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“…As reported in the literature [14,15] (220), (311), (222), (400), (422), (511), (440), respectively. The respective intensities of these peaks against the intensity of the maximum peak located at 2θ1=35.438 are as follows: 10%, 30%, 100%, 8%, 20%, 10%, 30%, 40%.…”

Section: Structural and Thermal Analysesmentioning

confidence: 52%

“…The sample is composed of nanoparticles in the size range between 7 and 28 nm. The particles are smaller than those in the corresponding FE-SEM image, after the heat treatment parameters indicated by A were followed (sample 14 in the previous study) [14]. It is evident that the increase in particle size resulted because the heat treatment temperature was allowed to reach a much higher value, 600 1C, in comparison with the temperature indicated by G, 250 1C.…”

Section: Morphology and Particle Sizementioning

confidence: 80%

“…According to the work reported in the previous study, the heat treatment conditions designated as A were carried out already, in both the horizontal tube furnace, and in the DTA/TGA equipment (sample 14 and Fig. 7) [14]. The analyses suggest that the product, identified as cobalt ferrite with a spinel structure, at 350 1C, became free of any organic or unstable inorganic impurities, because the solid (WtPercent[%]) became stable with no further oxidation or decomposition reactions to form gases about and above 350 1C.…”

Section: Structural and Thermal Analysesmentioning

confidence: 99%

“…In a previous study [14], cobalt ferrite powders were prepared and developed. It was suspected that the nanoparticles which had been synthesized had agglomerated and formed larger particles as a result of the heat treatment operation.…”

Section: Introductionmentioning

confidence: 99%

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Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Sajjia

Oubaha

Hasanuzzaman

et al. 2014

Ceramics International

Self Cite

149

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In the phase of the study reported, the sol-gel technique was followed in the preparation of cobalt ferrite amorphous powder following the same procedure which was selected as the best approach as described in a previous study. It was assumed that there must be a correlation between the heat treatment operational parameters and the structural properties of the material being synthesized. Similarly, it was understood that some heat treatment is necessary to completely decompose the organic and nitrate contents present in the amorphous powder. Having ensured that the heat treatment parameters could be changed without producing a material with poorer properties, it was then possible to produce batches of powders using milder conditions in the heat treatment operation. The particle size distributions of these new batches of nanoparticles were estimated to be in the range 7-28 nm and since the results showed promise, their magnetic properties were also determined.

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Section: Structural and Thermal Analysesmentioning

confidence: 52%

Section: Morphology and Particle Sizementioning

confidence: 80%

Section: Structural and Thermal Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Sajjia

Oubaha

Hasanuzzaman

et al. 2014

Ceramics International

Self Cite

149

View full text Add to dashboard Cite

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“…À temperatura ambiente apresenta estrutura cristalina cúbica do tipo espinélio inverso, que possibilita a este material propriedades magnéticas diferenciadas (Turtelli et al, 2012;Sajjia et al, 2010;Santos, 2008). Contudo, tais características e propriedades dependem do tamanho de cristalito e da uniformidade de suas partículas, as quais são suscetíveis aos parâmetros e métodos de preparação adotados.…”

Section: Introductionunclassified

Produção De Ferrita De Cobalto Por Coprecipitação Em Meio Oxalato

Medeiros¹,

Andrade²,

Moriyama³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -O desenvolvimento de cerâmicas surgiu como um dos campos mais promissores da área de novos materiais, tanto sob o ponto de vista experimental quanto teórico. Dentre esses materiais, as nanopartículas de ferrita de cobalto têm sido utilizadas como material de base em uma grande variedade de aplicações, tais como: sensores de gás, dispositivos de microondas, e catalisadores em reações de oxidação. Neste contexto, o presente trabalho propõe a obtenção de ferrita de cobalto em reator em batelada pelo método de coprecipitação em meio oxalato, e a análise da influência dos parâmetros de síntese na pureza dos pós e no tamanho de cristalito. Os experimentos foram realizados de acordo com planejamento experimental 2³. As variáveis independentes são o pH do meio reacional, a temperatura e o tempo de calcinação. Os pós foram caracterizados por DRX, EDS e FRX. Verificou-se que o pH é o fator de maior influência na pureza do material. Foi possível gerar modelo estatístico adequado aos resultados. INTRODUÇÃOA cada dia mais a tecnologia vem sendo desenvolvida para a melhoria da vida humana. Para isso, as descobertas minuciosas no âmbito atômico consistem em um diferencial inovador e revolucionário. A área da nanotecnologia se mostra como uma forma de criar, manipular e explorar materiais em escalas nanométricas, permitindo o aprimoramento e controle das propriedades dos mesmos. Sua aplicabilidade vai desde o setor médico até o eletrônico e químico (Durán et al, 2006). Dentre o vasto mundo da nanotecnologia, as nanopartículas magnéticas de ferrita de cobalto (CoFe 2 O 4 ) vêm sendo aplicadas, como, por exemplo, no campo de reações catalíticas. (Feng et al, 2013; Zhao e Ma, 2010;Tong, et al, 2009).O material em estudo deste trabalho, ferrita de cobalto, é um composto cerâmico com baixo custo de obtenção, alta resistência mecânica e estabilidade química. À temperatura ambiente apresenta estrutura cristalina cúbica do tipo espinélio inverso, que possibilita a este material propriedades magnéticas diferenciadas (Turtelli et al., 2012;Sajjia et al, 2010;Santos, 2008). Contudo, tais características e propriedades dependem do tamanho de cristalito e da uniformidade de suas partículas, as quais são suscetíveis aos parâmetros e métodos de preparação adotados. Desta forma, o presente trabalho tem como objetivo a obtenção de ferrita de cobalto nanoestruturada em Área temática: Engenharia de Materiais e Nanotecnologia 1

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Cobalt ferrite magnetic nanoceramics as an efficient nanocatalyst for the oxidation of olefins in the presence of molecular O₂ as an environmentally safe oxidant

Pashaei

Aghaei

2023

Applied Organom Chemis

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Selective oxidation of olefins using catalysts with unique structural and compositional characteristics, high cost‐efficiency, and optimal catalytic performance is still one of the ongoing tasks. In the present study, we synthesized cobalt ferrite (CoFe2O4) magnetic nanoceramics by the sol–gel process as a feasible and effective technique for synthesizing high purity, homogeneous, and crystalline nanoceramics. The nanoceramics were characterized by different analyses such as FT‐IR, XRD, DLS, SEM, XPS, and VSM to investigate their size, morphology, crystallinity, and magnetic properties. Then, the obtained nanoceramics were applied as an environmentally clean catalyst for the oxidation of various olefins to the corresponding epoxides in the presence of molecular O2 and at ambient conditions. The results showed that the CoFe2O4 nanoceramic could act as an efficient catalyst for converting olefins to the corresponding products with excellent yields. To further study the catalytic activity, the effects of some parameters, including catalyst concentration, temperature, time, and solvent, on the oxidation reactions were also studied. In addition, the heterogeneous CoFe2O4 catalyst has advantages such as high selectivity, facile recovery, and reusability of catalyst without a significant decrease in catalytic activity. Finally, our results showed that the catalytic performance of these nanoceramics is among the best reported catalysts for olefin oxidation.

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Development of cobalt ferrite powder preparation employing the sol–gel technique and its structural characterization

Cited by 98 publications

References 27 publications

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Produção De Ferrita De Cobalto Por Coprecipitação Em Meio Oxalato

Cobalt ferrite magnetic nanoceramics as an efficient nanocatalyst for the oxidation of olefins in the presence of molecular O₂ as an environmentally safe oxidant

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Development of cobalt ferrite powder preparation employing the sol–gel technique and its structural characterization

Cited by 98 publications

References 27 publications

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Produção De Ferrita De Cobalto Por Coprecipitação Em Meio Oxalato

Cobalt ferrite magnetic nanoceramics as an efficient nanocatalyst for the oxidation of olefins in the presence of molecular O2 as an environmentally safe oxidant

Contact Info

Product

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About

Cobalt ferrite magnetic nanoceramics as an efficient nanocatalyst for the oxidation of olefins in the presence of molecular O₂ as an environmentally safe oxidant