Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

Rabelo, Adriano Alves; Macedo, Marfran Cardoso de; Melo, D.M.A.; Paskocimas, C. A.; Martinelli, Antônio Eduardo; Nascimento, Rubens Maribondo do

doi:10.1590/s1516-14392011005000018

Cited by 22 publications

(11 citation statements)

References 28 publications

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“…In the FT-IR spectrum of the product after calcination, showed the main absorption band around 606 cm −1 corresponding to stretching of the metal-oxygen bond in the perovskite, which involves the internal motion of a change in Mn-O-Mn bond length in MnO 6 octahedral structure [25]. The bands' positions are in good agreement with those reported in the literature [26]. FT-IR of three samples were very similar to one another.…”

Section: Resultssupporting

confidence: 87%

Ultrasound and Microwave-Assisted Co-precipitation Synthesis of La0.75Sr0.25MnO3 Perovskite Nanoparticles from a New Lanthanum(III) Coordination Polymer Precursor

Yousefi

Ranjbar

2017

J Inorg Organomet Polym

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Section: Resultssupporting

confidence: 87%

Ultrasound and Microwave-Assisted Co-precipitation Synthesis of La0.75Sr0.25MnO3 Perovskite Nanoparticles from a New Lanthanum(III) Coordination Polymer Precursor

Yousefi

Ranjbar

2017

J Inorg Organomet Polym

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“…The bands at 1,626 cm -1 can be assigned to the stretching vibrations of C-H bonds. 29 From these spectra we can confirm that the nanoparticles are coated with silica as already seen in TEM images.…”

Section: Resultssupporting

confidence: 77%

Silica-coated gadolinium-doped lanthanum strontium manganite nanoparticles for self-controlled hyperthermia applications

2018

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Gadolinium-doped lanthanum strontium manganite (LSM) nanoparticles were synthesized by using a citrate-gel technique. The particles were then annealed at 850 oC to remove defects for a good crystallinity, followed by coating with silica for possible biomedical application to magnetic hyperthermia. The chemical composition was determined to be La0.54Sr0.27Gd0.19MnO3 using an inductively coupled plasma mass spectrometer. The nanoparticles were characterized by X-ray diffraction, transmission electron microscope, and Fourier transform infrared spectrometer to check the perovskite crystalline structure and to observe the particles size and coating status of silica on the surface of the particles. The Curie temperature of the particles was found to be about 280 K. The saturation temperature of the aqueous solution of the particles remained at the hyperthermia target temperature of 42 oC with increasing concentration of particles from 6 to 60 mg/mL in the dispersion. This saturation temperature for a highly concentrated 120-mg/mL-sample increased further, but less than the dangerous temperature of 47 oC for normal tissues. The saturation temperature of the powder sample reached only up to 53 oC. These results showed that the gadolinium-doped LSM nanoparticles can be used for the self-controlled hyperthermia in which the temperature does not exceed the target temperature of hyperthermia even at the tissue site of highly accumulated nanoparticles.

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“…This method, also called the Pechini method, allows the production of nanocrystalline powder samples at relatively low temperatures. This synthesis produces a polymer network starting from a polyhydroxy-alcohol and an alpha-hydroxycarboxylic acid, with metallic cations homogeneously distributed throughout the matrix [29]. The catalytic behavior in the ethanol steam reforming for hydrogen production was investigated by evaluating the effect of reaction temperature and cobalt content.…”

Section: Introductionmentioning

confidence: 99%

Preparation, structural characterization and catalytic properties of Co/CeO2 catalysts for the steam reforming of ethanol and hydrogen production

Lovón

Lovón-Quintana

Almerindo

et al. 2012

Journal of Power Sources

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h i g h l i g h t s < Ceria-supported cobalt catalysts, with different cobalt contents, were prepared by the polymeric precursor method. < The catalysts were evaluated for the steam reforming of ethanol for hydrogen production. < The cobalt content of the catalyst influences the metal-support interaction which results in distinct catalyst performances. < The catalyst with the highest cobalt content showed the best performance among the catalysts tested. a b s t r a c tIn this paper, Co/CeO 2 catalysts, with different cobalt contents were prepared by the polymeric precursor method and were evaluated for the steam reforming of ethanol. The catalysts were characterized by N 2 physisorption (BET method), X-ray diffraction (XRD), UVevisible diffuse reflectance, temperature programmed reduction analysis (TPR) and field emission scanning electron microscopy (FEG-SEM). It was observed that the catalytic behavior could be influenced by the experimental conditions and the nature of the catalyst employed. Physicalechemical characterizations revealed that the cobalt content of the catalyst influences the metal-support interaction which results in distinct catalyst performances. The catalyst with the highest cobalt content showed the best performance among the catalysts tested, exhibiting complete ethanol conversion, hydrogen selectivity close to 66% and good stability at a reaction temperature of 600 C.

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Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

Cited by 22 publications

References 28 publications

Ultrasound and Microwave-Assisted Co-precipitation Synthesis of La0.75Sr0.25MnO3 Perovskite Nanoparticles from a New Lanthanum(III) Coordination Polymer Precursor

Ultrasound and Microwave-Assisted Co-precipitation Synthesis of La0.75Sr0.25MnO3 Perovskite Nanoparticles from a New Lanthanum(III) Coordination Polymer Precursor

Silica-coated gadolinium-doped lanthanum strontium manganite nanoparticles for self-controlled hyperthermia applications

Preparation, structural characterization and catalytic properties of Co/CeO2 catalysts for the steam reforming of ethanol and hydrogen production

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