Morphology and Thermal Stability of Boehmite HydrothermallySynthesized in the Presence of Metal Acetates

DOI 2 Citations
  • FUJIYOSHI Kaichi
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • ISHIDA Shingo
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • TAKEUCHI Nobuyuki
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology

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Other Title
  • 金属酢酸塩共存下で水熱合成されたベーマイトの形状と熱安定性

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Description

Morphology of boehmite crystals hydrothermally synthesized from gibbsite in metal acetate solutions at 200°C were studied in connection with the chemical species in the hot solutions. In acetate (MAc<SUB>2</SUB>) solutions where cations were large-sized, plate-like boehmite crystals were formed (M = Ba, Sr, Ca). On the other hand, columnar crystals were produced in MAc<SUB>2</SUB> solutions where M were comparatively small-sized cations (M = Mg, Mn, Co). It was assumed that when highly stable cationic complexes between metal and acetate ions were absorbed on growing boehmite crystals, they blocked the access of AlO2- and eventually regulated the crystal morphology to from columnar crystals. Formation of not columnar but plate-like boehmite crystals observed in the cases of synthesis in rare-earth acetate (REAc<SUB>3</SUB>) solutions was explained in terms of the low blocking ability of electrically neutral REAc<SUB>3</SUB> species resulting from its weak absorption on the crystal surfaces.

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Details 詳細情報について

  • CRID
    1390001205389738112
  • NII Article ID
    130004012017
  • DOI
    10.11451/mukimate2000.8.204
  • ISSN
    21854378
    13453769
  • Data Source
    • JaLC
    • CiNii Articles
    • Crossref
  • Abstract License Flag
    Disallowed

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