Solid-precursor vaporizer for aerosol reactors: Synthesis of magnesium aluminate nanoparticles by thermal decomposition of magnesium aluminum tert-butoxide

Park, Kyun Young; Choi, Jae Gil; Sung, Kiwhan; Kim, Yunsoo

doi:10.1007/s11051-005-9053-6

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…2(e)), that the ratio of (Mg:Al) is (1:2.07), as calculated using appropriate atomic sensitivity factors. 33,34 The survey scan report (not displayed) of the XPS study also clearly demonstrated the formation of defective spinel phase over graphite.…”

Section: Methodsmentioning

confidence: 93%

Spinel‐Coated Graphite for Carbon Containing Refractory Castables

Mukhopadhyay

Dutta

Ansar

et al. 2009

Journal of the American Ceramic Society

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Oxidation resistance and water wettability of graphite flakes have been improved by a thin sol–gel film of magnesium aluminate spinel (MgAl2O4) over its surface. The hydrosol has been synthesized by less expensive precursors and the spinel formation has been studied by scanning electron microscopy (SEM), supplemented with energy dispersive spectral analysis. After an easy‐to‐use mixing procedure, drying (110°C), and subsequent calcination (550°C), coated graphites were sieved to below 75 μm. The coating over the powder contained 1.5 wt% MgAl2O4, which enormously increased the oxidation resistance (performed at 600°, 900°, and 1200°C) and water wettability, as revealed by hydrophilic functional groups from infrared spectra. Defective, intermediate spinel structure of fine, lamellar Mg‐doped γ‐Al2O3 has been considered to be significant for this improvement. An approximate (1:2) stoichiometry of (Mg:Al) in the coating composition was confirmed by an X‐ray photoelectron spectroscopy test. Castables prepared by this graphite remarkably improved their bulk density and apparent porosity compared with those prepared by the as‐received graphite. Casting water was reduced along with the amount of antioxidants. This also enhanced the resistance toward the basic slag by retaining the graphite in the refractory.

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Section: Methodsmentioning

confidence: 93%

Spinel‐Coated Graphite for Carbon Containing Refractory Castables

Mukhopadhyay

Dutta

Ansar

et al. 2009

Journal of the American Ceramic Society

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“…7, O 1s asymmetric signal for the composite prepared at 600 C may consist of four components such as cobalt oxide (530 eV), magnesium oxide (531 eV), aluminium oxide (532 eV) and magnesium aluminium oxide (534 eV) [40,41,43]. For the composites prepared at higher temperatures of 700 and 800 C, O 1s signal becomes less intense and additionally its position is shifted.…”

Section: Scanning and Transmission Electron Microscopymentioning

confidence: 99%

“…According to the XPS spectra shown in Fig. 7, Mg 2p asymmetric signal may consist of two components, namely magnesium oxide (51 eV) and magnesium aluminium oxide (55 eV) [40,41]. Analysis of XPS spectra displayed in Fig.…”

Section: Scanning and Transmission Electron Microscopymentioning

confidence: 99%

Examination of the electroactive composites containing cobalt nanoclusters and nitrogen-doped nanostructured carbon as electrocatalysts for oxygen reduction reaction

Pacuła

Ikeda

Masuda

et al. 2012

Journal of Power Sources

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“…Several preparation methods such as hydrothermal techniques [11,12], sol-gel [13,14], flame spray pyrolysis [15], cool drying [16,17], controlled hydrolysis [18], co-precipitation [5,19] and aerosol method [20,21] have been developed to synthesize magnesium aluminate spinels. Among these methods, co-precipitation is viewed as a simple method to synthesize spinel.…”

Section: Introductionmentioning

confidence: 99%