Synthesis, characterization and influence of calcination temperature on magnetic properties of nanocrystalline spinel Co-ferrite prepared by polymeric precursor method

Gharagozlou, Mehrnaz

doi:10.1016/j.jallcom.2009.07.025

Cited by 145 publications

(59 citation statements)

References 29 publications

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“…[10][11][12]15,19] or comparable [13,[16][17][18] with other reported methods. Moreover, this method does not require any corrosive reagent like NaOH and any elaborate experimental setup.…”

Section: Magnetic Measurementmentioning

confidence: 82%

“…Synthesis routes are commonly used for CoFe 2 O 4 are co-precipitation [10][11][12][13][14], sol-gel [15,16], *Corresponding author. Email: naren70@yahoo.com precursors [17][18][19], reverse micelle [20], microemulsion [21], hydrothermal [22], etc. However, several limitations are associated with these methods which make these processes relatively complex and expensive.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Rajput

Hazra

Ghosh

2012

Journal of Experimental Nanoscience

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Single-phase cobalt ferrite (CoFe 2 O 4 ) nanopowder, with average particle size �20 nm, has been synthesised using an ethylene diamine tetra acetic acid precursor-based method. CoFe 2 O 4 nanopowder was obtained by calcining precursor at 550 � C for 4 h in air. The change of microstructure of the synthesised CoFe 2 O 4 with increasing sintering temperature was studied using scanning electron microscopy. DC electrical resistivities of unsintered and sintered samples were measured using a two-probe method. Room temperature magnetic hysteresis measurement revealed that the synthesised CoFe 2 O 4 nanopowder exhibited ferromagnetic behaviour at room temperature with saturation magnetisation of 67.55 emu/g and coercivity of 1645.24 Oe.

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“…[10][11][12]15,19] or comparable [13,[16][17][18] with other reported methods. Moreover, this method does not require any corrosive reagent like NaOH and any elaborate experimental setup.…”

Section: Magnetic Measurementmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Rajput

Hazra

Ghosh

2012

Journal of Experimental Nanoscience

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“…Heat treatment would have also caused agglomeration, resulting in bigger grains. This is a typical characteristic feature of spinel ferrites [33,35]. By analyzing both the samples, sample prepared using PF act as better surfactant than sample prepared using WF.…”

Section: Fourier Transform Infrared Spectroscopy (Ft-ir) Studiesmentioning

confidence: 98%

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Jacintha

Umapathy

Neeraja³

et al. 2017

J Nanostruct Chem

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Nanosized manganese ferrite (MnFe 2 O 4 ) particles were prepared by sol-gel method using natural polymers like wheat flour (WF) and potato flour (PF) as surfactants and its structural, morphological, optical and magnetic characteristics were studied by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), scanning electron microscope (SEM), photoluminescence spectroscopy (PL) and vibration sample magnetometer (VSM). Brunauer-Emmett-Teller (BET) surface area test also performed and the results obtained were discussed. The average crystallite size was found to be 23 and 16 nm for WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples, respectively. Magnetic hysteresis loops confirmed the super-paramagnetic behavior for both the samples. For oxidation of benzyl alcohol to benzaldehyde, the catalytic activity of MnFe 2 O 4 nanoparticles (NPs) was carried out. Antimicrobial and antifungal activity of WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples were investigated against two Gram-positive bacteria (Staphylococcus aureus, Streptococcus pneumoniae), two Gram-negative bacteria (Pseudomonas aeruginosa, Salmonella paratyphi) and fungus (Candida albicans) using inhibition zone method. Minimum Inhibitory Concentration (MIC) values also calculated to determine susceptibilities of bacteria to drugs and also to evaluate the activity of new antimicrobial agents. The in vitro cytotoxicity of newly synthesized samples were analyzed by MTT assay against MCF-7, A549 and HaCaT cell lines in a dose-dependent fashion. Among these two samples, sample B (using potato flour) shows better response than sample A (using wheat flour) and both the samples were non-toxic to normal cell line. The concentration required to kill 50% of the cell (IC 50 ) was also calculated. Graphical AbstractMnFe 2 O 4 nanoparticles were synthesized by sol-gel method using natural polymers, wheat flour and potato flour, as surfactant. The as-prepared MnFe 2 O 4 was characterized by XRD, FT-IR, SEM, EDX, PL and VSM analysis. The average crystallite size was found to be 23 and 16 nm for WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples, respectively. Magnetic hysteresis loops confirmed the super-paramagnetic behavior for both the samples. The catalytic activity of MnFe 2 O 4 nanoparticles (NPs) were carried out for oxidation of benzyl alcohol to benzaldehyde. Biological activities like antimicrobial, antifungal and anticancer activities of the samples were investigated. Among these two samples, PF/MnFe 2 O 4 shows better response than WF/MnFe 2 O 4 and both the samples were non-toxic to normal cell line.

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“…As bandas fortes entre 1580 a 1300 cm -1 são relacionadas aos estiramentos assimétrico υ as (COO) e simétrico υ s (COO) do grupo carboxila, respectivamente, que confi rmam a coordenação dos íons metálicos por grupos carboxilatos na forma de um complexo bidentado. Nos espectros também é possível observar um deslocamento da banda que indica óxidos estiramento υ(M-O) em 590 cm -1 para aproximadamente 680 cm -1 [15]. Os espectros de infravermelho de todas as amostras são muito similares, o que sugere que em todos os casos há a coordenação do ligante ao metal e é sugestivo de ligação do tipo quelato.…”

Section: Resultsunclassified

Estudo da influência das condições de síntese do método dos precursores poliméricos na formação de perovsquitas do tipo LaNiO3

et al. 2011

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INTRODUÇÃONos últimos anos, várias pesquisas têm sido focadas no desenvolvimento de novas rotas para a síntese de óxidos do tipo perovsquitas, a fi m de controlar a morfologia do produto fi nal e a pureza da fase desejada. Estes esforços são conseqüências das perovsquitas serem consideradas materiais estratégicos de interesse mundial, devido as suas interessantes propriedades, tais como ferroelétricas, magnéticas, eletrônicas, ópticas e catalíticas, dentre outras. Perovsquitas são óxidos mistos com fórmula geral ABO 3 , em que o cátion no sítio A é uma terra rara e/ ou alcalino terroso e o cátion no sítio B é um metal de transição 3d, no estado oxidação +3 [1][2][3][4].LaNiO 3 pertence ao grupo de materiais com estrutura perovsquita, mostra caráter metálico, que é bastante incomum em óxidos, e é bem conhecido como um óxido bom condutor de eletricidade aplicado como material de elétrodo em dispositivos eletrônicos [3,5]. Este material é bem conhecido por ser uma perovsquita romboédrica, que apresenta um caráter metálico abaixo de 4,2 K. As propriedades elétricas e magnéticas destes óxidos são regidas pelos efeitos de correlação eletrônica forte [5]. Uma característica interessante desses óxidos mistos é que a sua atividade catalítica pode ser altamente melhorada pela substituição parcial nos sítios A e/ou B, com apenas pequenas mudanças na estrutura média [4,6]. Tanto os cátions no sítio A quanto no B podem ser substituído por diferentes cátions, A' e B', melhorando a estabilidade estrutural da perovsquita e introduzindo defeitos estruturais (vacâncias de oxigênio) e eletrônicos. A substituição parcial do cátion no sítio A por um íon de valência diferente mostrou infl uenciar a atividade catalítica por estabilizar o cátion no sítio B em estados de oxidações incomuns [6]. ResumoA perovsquita do tipo LaNiO 3 é um material que exibe aplicações em diversas áreas como catálise, óptica, células a combustível de óxido sólido, etc.. Neste trabalho, a otimização da síntese de perovsquitas do tipo LaNiO 3 foi feita pelo método dos precursores poliméricos, modifi cando as razões metal/ácido cítrico e etilenoglicol/ácido cítrico. Em geral, as propriedades destes materiais variam com a composição e com o método de síntese. Os materiais sintetizados foram caracterizados por difração de raios X, análise termogravimétrica e espectroscopia de infravermelho. As perovsquitas com razões metal/ácido cítrico (1,0/1,0) e etilenoglicol/ácido cítrico (60/40) apresentaram melhores resultados em relação à obtenção da fase perovsquita monofásica. Palavras-chave: LaNiO 3 , infl uência da condição de síntese, método dos precursores poliméricos. Abstract

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Synthesis, characterization and influence of calcination temperature on magnetic properties of nanocrystalline spinel Co-ferrite prepared by polymeric precursor method

Cited by 145 publications

References 29 publications

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Estudo da influência das condições de síntese do método dos precursores poliméricos na formação de perovsquitas do tipo LaNiO3

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Synthesis, characterization and influence of calcination temperature on magnetic properties of nanocrystalline spinel Co-ferrite prepared by polymeric precursor method

Cited by 145 publications

References 29 publications

Synthesis and characterisation of pure single-phase CoFe2O4 nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe2O4 nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Estudo da influência das condições de síntese do método dos precursores poliméricos na formação de perovsquitas do tipo LaNiO3

Contact Info

Product

Resources

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Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route

Synthesis and characterisation of pure single-phase CoFe₂O₄ nanopowder via a simple aqueous solution-based EDTA-precursor route