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Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium


Musić, Svetozar; Dragčević, Đurđica; Popović, Stanko; Vdović, Neda
Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium // Materials chemistry and physics, 59 (1999), 1; 12-19 (međunarodna recenzija, članak, znanstveni)


Naslov
Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium

Autori
Musić, Svetozar ; Dragčević, Đurđica ; Popović, Stanko ; Vdović, Neda

Izvornik
Materials chemistry and physics (0254-0584) 59 (1999), 1; 12-19

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Sažetak
Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions at pH~11 were investigated using X-ray powder diffraction (XRPD), Fourier transform infrared spectroscopy, microelectrophoresis and transmission electron microscopy. The bayerite and a small amount of gibbsite formed at the beginning of the precipitation process at 160 oC transformed to boehmite by the dissolution/reprecipitation mechanism. The rate of this process was significantly decreased at 90 oC. At 50 oC, an opposite kind of phase transition was observed between 25 min and 1 day of aging, when bayerite was found as a single phase. It was also found that formation of gibbsite was dependent on the type of Al(III)-salt used. The boehmite crystallites had an anisotropic shape, with sizes in the nanometer range. Formation of boehmite was preferred in all precipitation systems containing 0.02 M sodium citrate, and the crystallinity of boehmite depended on the experimental conditions. Specifically adsorbed citrates significantly decreased pHiep values of Al-oxide particles. Boehmite particles were in the form of tiny plates, while bayerite particles showed somatoid morphology.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
00980903

Ustanove
Institut "Ruđer Bošković", Zagreb

Citiraj ovu publikaciju

Musić, Svetozar; Dragčević, Đurđica; Popović, Stanko; Vdović, Neda
Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium // Materials chemistry and physics, 59 (1999), 1; 12-19 (međunarodna recenzija, članak, znanstveni)
Musić, S., Dragčević, Đ., Popović, S. & Vdović, N. (1999) Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium. Materials chemistry and physics, 59 (1), 12-19.
@article{article, year = {1999}, pages = {12-19}, keywords = {}, journal = {Materials chemistry and physics}, volume = {59}, number = {1}, issn = {0254-0584}, title = {Chemical and microstructural properties of Al-oxide phases obtained from AlCl3 solutions in alkaline medium}, keyword = {} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus