Determination of the shape, size and porosity of fine alpha-Al2O3 powders prepared by emulsion evaporation

Sarikaya Y., Alemdaroglu T., ÖNAL M.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, cilt.22, sa.3, ss.305-309, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Sayı: 3
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0955-2219(01)00294-1
  • Dergi Adı: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.305-309
  • Anahtar Kelimeler: Al2O3, calcination, emulsions, porosity, powders-chemical preparation, ALUMINA POWDERS
  • Ankara Üniversitesi Adresli: Evet

Özet

Stable water in oil emulsions were prepared from Al(NO3)(3) solutions of different molarities. Dark brown precursors were obtained from these emulsions which were evaporated by adding them dropwise into hot mineral oil. The precursors containing diaspore as raw alumina were calcined at 1000 degreesC and fine alpha -Al2O3 powders were obtained. The photographs of the powders were taken by the use of an electron microscope and their particle size distributions were determined. The shapes and sizes of the powders were discussed. Their mesopore size distributions were obtained from the data of the desorption of nitrogen at 77 K. The relation between the obtained results and the concentrations of the Al(NO3)(3) solutions were discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.