Deagglomeration process of nanoceramic powders-challenges and practice

Mikolaj Szafran ,  Paweł Falkowski ,  Anna W. Danelska ,  Tadeusz Mizerski 

Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, Warszawa 00-664, Poland

Abstract

The results of studies on application of selected mono-, di- and oligosaccharides in the deflocculation process of nanometric alumina and zirconia slurries are presented. In the research nanometric alumina powder of average grain size 47 nm and specific surface area measured by BET method SBET = 35 m2/g was used. In the research of nanometric zirconia powders two kinds of powders were used: average grain size 17 and 44 nm with specific surface area measured by BET method SBET = 35 m2/g  and 65 m2/g respectively. To explain the influence of the individual hydroxyl groups of saccharide on the adsorption process on the n-Al2O3 and n-ZrO2 surface and the reduction process of the particle agglomeration were performed. The influence of D-fructose, D-glucose, L-sorbose; and disaccharids: maltose and saccharose on nanometric alumina and zirconia slurry have been carried out. The results obtained with mono- and disaccharides have been compared with the results on inulin. Inulin is oligosaccharide which consists of fructose units connected in chain (about 12 units) and ended by a glucose molecule from one side. It has been found that not only the amount of hydroxyl groups but also their orientation in saccharides molecule and their orientation to the surface of nanopowder are the main factors which decide about the amount of water connected with the nanometric alumina and zirconia particles and directly influenced oh the rheological properties of alumina slurry.

The work was supported by the Polish Ministry of Science and Higher Education nr N205 009 31/053

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Presentation: Invited oral at E-MRS Fall Meeting 2009, Symposium I, by Mikolaj Szafran
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-22 10:19
Revised:   2009-06-07 00:48
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