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 S_BET = 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 S_BET = 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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