Preparation of MgFe2O4 nanoparticles by microemulsion method and their characterization

Holec, Petr; Plocek, Jiřı́; Nižňanský, Daniel; Vejpravová, J.

doi:10.1007/s10971-009-1962-x

Cited by 57 publications

(29 citation statements)

References 4 publications

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“…Sasaki et al [33] prepared magnesioferrite nano-particles by hydrothermal synthesis in supercritical water with particle size of about 20 nm and saturation magnetization of 20 emu/g. Holec et al [34] produced MgFe 2 O 4 nano-crystals with intermediate phase (MgO) by reverse micelle method at 900 • C with particle size and saturation magnetization of 39 nm and 32 emu/g, respectively.…”

Section: Introductionmentioning

confidence: 99%

Novel preparation and properties of magnesioferrite nanoparticles

Deraz

Alarifi

2012

Journal of Analytical and Applied Pyrolysis

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Section: Introductionmentioning

confidence: 99%

Novel preparation and properties of magnesioferrite nanoparticles

Deraz

Alarifi

2012

Journal of Analytical and Applied Pyrolysis

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“…Candeia et al (2006), utilizaram o método solgel para sintetizar magnesioferrita que consiste, basicamente, na utilização de nitrato de ferro (III) e carbonato de magnésio além de ácido cítrico e etileno-glicol, para promover a esterificação, sendo que o final da reação é a formação de um gel polimérico. Holec et al (2009) de magnesioferrita pode ser efetuada pelo método hidrotérmico em microondas, com aquecimento a 150ºC e pressão de 50psi por 25 minutos, em frascos de teflon.…”

Section: Fonte: Costa E Bigham (2009)unclassified

Síntese de magnesioferrita a partir de magnetitas magnesianas

Anami

Costa

2013

Semina: Tech. Ex.

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ResumoMagnesioferrita é um importante mineral devido a sua utilização em diferentes campos da ciência e pelo fato de que no solo, pela ação do intemperismo, pode ser fonte de nutrientes essenciais ao desenvolvimento das plantas. A sua utilização na forma pura ou associada a outros minerais só é possível através da síntese em laboratório. Este trabalho teve por objetivo sintetizar magnesioferrita e hematita a partir de magnetita-magnesiana pelo método de co-precipitação. A metodologia utilizada é uma adaptação do método de síntese de magnetita pura, substituindo parcialmente os sais solúveis de ferro por sais solúveis de magnésio na proporção de 30,0 mol% de Fe por Mg. Para caracterização dos materiais foram utilizadas as técnicas de difração de raios-x, análise química total e susceptibilidade magnética por unidade de massa. Os resultados mostraram que além de magnetita-magnesiana foi sintetizada uma inédita muskoxita, que após o tratamento térmico foi convertida a magnesioferrita e hematita na proporção de 93,1% e 6,9% respectivamente. A substituição isomórfica do Fe por Mg aumentou a estabilidade térmica do mineral ferrimagnético sintetizado. Palavras-chave: Óxidos de ferro. Ferrimagnetismo. Susceptibilidade magnética. Maghemita. AbstractMagnesioferrite is an important mineral due to its use in different scientific fields and by the fact that the soil through the action of weathering, can be a source of nutrients essential for plant development by the fact that in the soil. Its use in pure form or associated with other minerals is only possible through the synthesis in laboratory conditions. This study aimed to synthesize magnesioferrite and hematite from magnesian-magnetite by a co-precipitation procedure. The methodology used is an adaptation of the method of synthesis of pure magnetite, partially replacing the soluble salts of iron with soluble magnesium salts in the proportion of 30.0 mol% of Fe for Mg. The characterization of the synthetic minerals used x-rays diffraction, total chemical analysis and mass specific magnetic susceptibility. The results showed that besides the magnesian-magnetite an unprecedented muskoxita was synthesized, which upon annealing was converted to magnesioferrite and hematite and in the proportion of 93.1% and 6.9% respectively. The isomorphous substitution of Fe for Mg enhanced the thermal stability of the ferrimagnetic mineral synthesized.

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“…[25] The colloid solution was prepared by adding 1 mg of the dry nanoparticles into 2 ml of methanol. The mixture was then sonicated for 5 min, decanted for 5 min and centrifuged (at 10 000 rcf for 3 min) to remove nanoparticles that aggregated during sonication.…”

Section: Nanoparticlesmentioning

confidence: 99%

Scanning electron microscopic imaging of surface effects in desorption and nano‐desorption electrospray ionization

et al. 2011

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Scanning electron microscopy was used to investigate rivulets that are formed on the analyzed surface during desorption electrospray ionization (DESI) experiment. Ferromagnetic nanoparticles added to the spray solvent in a form of colloid solution functioned as an additional surface probe. The existence of the rivulets was confirmed on glass and newly demonstrated on two different types of porous polytetrafluoroethylene (PTFE). The results show that in standard DESI set-up the rivulets are arranged into very regular shapes. Same rivulets were obtained in DESI experiments without high voltage on the sprayer. However, no such rivulets or any other regular patterns were found on a surface in nano-DESI (nanospray DESI without the carrier nebulizing gas) experiments. This indicates that symmetrical rivulets are created by the hydrodynamical rather than electrostatic forces. It was also demonstrated that blocking the rivulets by a simple physical barrier did not influence known surface charging effects.

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Preparation of MgFe2O4 nanoparticles by microemulsion method and their characterization

Cited by 57 publications

References 4 publications

Novel preparation and properties of magnesioferrite nanoparticles

Novel preparation and properties of magnesioferrite nanoparticles

Síntese de magnesioferrita a partir de magnetitas magnesianas

Scanning electron microscopic imaging of surface effects in desorption and nano‐desorption electrospray ionization

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