The effect of Al3+ concentration on the properties of alumina powders obtained by reaction between aluminium sulphate and urea in boiling aqueous solution

dc.contributor.authorSarikaya, Y.
dc.contributor.authorAda, K.
dc.contributor.authorAlemdaroğlu, T.
dc.contributor.authorBozdoğan, I.
dc.date.accessioned2020-06-25T17:34:58Z
dc.date.available2020-06-25T17:34:58Z
dc.date.issued2002
dc.departmentKırıkkale Üniversitesi
dc.description.abstractHomogeneous precipitation of alumina precursors was carried out in boiling aqueous solutions that contained excess urea and 0.010 0.200 M Al3+. The obtained precursor precipitates were dried for 2 h at 100 C to yield precursor powders and the precursor powders were calcined for 2 h at 1000 degreesC to yield alumina powders. Precursor powders and alumina powders were investigated by X-ray diffraction (XRD), electron microscopy (EM), particle size distribution (PSD) analysis and nitrogen adsorption-desorption techniques for characterisation. Inspection of the XRD data showed that the precursor powders were amorphous in nature and the final product was delta-Al2O3, Investigation of the EM and PSD data of the powders showed that they contained unequally sized spheres and agglomerates. It was determined that, as the Al3+ concentration in the boiling aqueous solution increased, the number of 0.3-1.0 mum sized independent particles decreased and the sizes of agglomerates grew between 1.00 100 mum while their volume percentages increased from 50 to 80%. It was also observed that the specific surface areas of the alumina powders decreased from 98 m(2) g(-1) to 54 m(2) g(-1) and their specific micropore-mesopore volumes decreased from 0.31 cm(3) g(-1) to 0.14 cm(3) g(-1) as the Al3+ concentration in the boiling aqueous solution increased. It was observed that it was possible to prepare alumina powders that have different particle size distributions and different porosities by changing the Al3+ concentration while keeping the [urea]/[Al3+] ratio constant at a value of 5.4 in the boiling aqueous solution. (C) 2002 Elsevier Science Ltd. All rights reserved.en_US
dc.identifier.citationclosedAccessen_US
dc.identifier.doi10.1016/S0955-2219(01)00514-3
dc.identifier.endpage1910en_US
dc.identifier.issn0955-2219
dc.identifier.issn1873-619X
dc.identifier.issue12en_US
dc.identifier.scopus2-s2.0-0036833038
dc.identifier.scopusqualityQ1
dc.identifier.startpage1905en_US
dc.identifier.urihttps://doi.org/10.1016/S0955-2219(01)00514-3
dc.identifier.urihttps://hdl.handle.net/20.500.12587/2969
dc.identifier.volume22en_US
dc.identifier.wosWOS:000176491500001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofJournal Of The European Ceramic Society
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectagglomerationen_US
dc.subjectAl2O3en_US
dc.subjectporosityen_US
dc.subjectpowders-chemical preparationen_US
dc.titleThe effect of Al3+ concentration on the properties of alumina powders obtained by reaction between aluminium sulphate and urea in boiling aqueous solutionen_US
dc.typeArticle

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