Size-controlled synthesis of nanoscaled aluminium spinels using heterobimetallic alkoxide precursors via water/oil microemulsions

Meyer, F.; Dierstein, Anne; Beck, C.; Härtl, W.; Hempelmann, Rolf; Mathur, Sanjay; Veith, Michael

doi:10.1016/s0965-9773(99)00068-9

Cited by 33 publications

(20 citation statements)

References 10 publications

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“…Also inhomogeneity, lack of stoichiometry control, high temperature is the disadvantages of solid-state routes. But various wet chemical techniques have been applied for the synthesis of pure spinel powders at relatively low temperatures to improve the sinterability and fabrication fine particles including hydroxide or carbonate salts co-precipitation [13] classical sol-gel route [14][15][16], spray drying [17], freezedrying [18], mechanochemical synthesis [7,19], hydrothermal [20,21], microwave-assisted combustion processing [22], microemulsion [23] and etc Successfully used for the production of pure spinel powders. Among the wet chemical routes, Sol-gel technique has been used widely because it has the advantage of producing pure, ultrafine powders at low temperatures, High surface area and pore size distribution [24][25][26][27] A modified sol-gel method for preparing the metal oxides is Pechini method [28].…”

Section: -Introductionmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Sanjabi

Obeydavi

2015

Journal of Alloys and Compounds

105

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Section: -Introductionmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Sanjabi

Obeydavi

2015

Journal of Alloys and Compounds

105

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“…The standard method is via a solid-state reaction of the parent oxides. Other synthesis methods include sol-gel, 22,23 co-precipitation, 24,25 hydrothermal, 26 polymeric precursor, 27 and vapor deposition processing. 28 We demonstrate here the use of liquid-feed flame spray pyrolysis (LF-FSP) to assess combinatorially compositions along the CoO x -Al 2 O 3 tie line.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Mixed‐Metal Oxide Nanopowders Along the CoO_x–Al₂O₃ Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Azurdia

Marchal

Laine

2006

Journal of the American Ceramic Society

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We report here the use of liquid‐feed flame spray pyrolysis (LF‐FSP) to produce a series of nanopowders along the CoOx–Al2O3 tie line. The process is a general aerosol combustion synthesis route to a wide range of lightly agglomerated oxide nanopowders. The materials reported here were produced by aerosolizing ethanol solutions of alumatrane [Al(OCH2CH2)3N] and a cobalt precursor, made by reacting Co(NO3)2·6H2O crystals with propionic acid. The compositions of the as‐produced nanopowders were controlled by selecting the appropriate ratios of the precursors. Nine samples with compositions (CoO)y(Al2O3)1−y, y=0−1 along the CoOx–Al2O3 tie line were prepared and studied. The resulting nanopowders were characterized by X‐ray fluorescence, BET, scanning electron microscopy, high‐resolution transmission electron micrographs, X‐ray diffraction (XRD), thermogravimetric analysis (TGA), and FTIR. The powders typically consist of single‐crystal particles <40 nm diameter and specific surface areas (SSAs) of 20–60 m2/g. XRD studies show a gradual change in powder patterns from δ‐Al2O3 to Co3O4. The cobalt aluminate spinel phase is observed at stoichiometries (21 and 37 mol%) not seen in published phase diagrams, likely because LF‐FSP processing involves a quench of >1000°C in microseconds frequently leading to kinetic rather than thermodynamic products. Likewise, the appearance of Co3O4 rather than CoO as the end member in the tie line is thought to be a consequence of the process conditions. TGA studies combined with diffuse reflectance FTIR spectroscopic studies indicate that both physi‐ and chemi‐sorbed H2O are the principal surface species present in the as‐processed nanopowders. The only sample that differs is Co3O4, which has some carbonate species present that are detected and confirmed by a sharp mass loss event at ∼250°C. The thermal behavior of the high cobalt content samples differs greatly from the low cobalt content samples. The latter behave like most LF‐FSP‐derived nanopowders exhibiting typical 1%–4% mass losses over the 1400°C range due mostly to loss of water and some CO2. The high cobalt content samples exhibit a sharp mass loss event that can be attributed to the decomposition of Co3O4 to CoO.

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“…Coloration of plastics, fibers, rubber, glass, ceramic bodies, paint and porcelain are other uses of this material because this nano‐catalyst is a thermally and chemically stable pigment . For the synthesis of cobalt aluminate oxide several techniques such as sol–gel, EDTA chelating precursor, polymer aerosol pyrolysis, reverse micelle processes, oil‐in‐water, molten salt, hydrothermal, combustion, and Pechini are reported. Heterogeneous catalyst (nano‐CoAl 2 O 4 ) has many advantages including good selectivity with high stability, reusability and simple recyclability .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of nano‐CoAl₂O₄ as an efficient catalyst in the preparation of hexahydroquinolines

Khazaei

Jafari-Ghalebabakhani

Ghaderi

et al. 2017

Applied Organom Chemis

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In this work, nano-CoAl 2 O 4 was prepared and characterized by FT-IR, energy dispersive X-ray analysis (EDX), X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and transmission electron microscopy (TEM). Nano-CoAl 2 O 4 was applied for the synthesis of hexahydroquinoline derivatives by the condensation reaction between ethyl acetoacetate, dimedone and various aldehydes. These reactions were carried out at 80°C under solvent-free conditions.

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Size-controlled synthesis of nanoscaled aluminium spinels using heterobimetallic alkoxide precursors via water/oil microemulsions

Cited by 33 publications

References 10 publications

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Synthesis and Characterization of Mixed‐Metal Oxide Nanopowders Along the CoO_x–Al₂O₃ Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Synthesis, characterization and application of nano‐CoAl₂O₄ as an efficient catalyst in the preparation of hexahydroquinolines

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Size-controlled synthesis of nanoscaled aluminium spinels using heterobimetallic alkoxide precursors via water/oil microemulsions

Cited by 33 publications

References 10 publications

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

Synthesis and Characterization of Mixed‐Metal Oxide Nanopowders Along the CoOx–Al2O3 Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Synthesis, characterization and application of nano‐CoAl2O4 as an efficient catalyst in the preparation of hexahydroquinolines

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Synthesis and Characterization of Mixed‐Metal Oxide Nanopowders Along the CoO_x–Al₂O₃ Tie Line Using Liquid‐Feed Flame Spray Pyrolysis

Synthesis, characterization and application of nano‐CoAl₂O₄ as an efficient catalyst in the preparation of hexahydroquinolines