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        Effect of use dextrin as bio-dispersants on structural and morphological properties of Al2O3 ceramic materials

        Matias Scherer Lunkes 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.3

        Polysaccharides are commonly used as binders in metal oxide colloidal processing. However, if the macromolecular chains areable to adsorb on ceramic particles surface, the suspension deflocculating properties are also favored. This paper investigatedthe use of dextrin as a bio-dispersant on structural and morphological properties of Al2O3 materials. The interactionmechanism between dextrin and Al2O3 surface and the additive efficiency of producing less agglomerated systems werediscussed. The suspensions behavior was pH-dependent, being the pH 6 the best condition for obtaining more compact systemsin dextrin presence. The first monolayer saturation of the Al2O3 active sites occurred at 1.5 wt. % of dextrin and a secondadsorption layer started above this additive concentration. The highest percentage of densification was 96.25% for thesuspension containing 30 vol. % solids and 1 wt. % dextrin. The presence of dextrin also influenced the microstructure of thesystems, providing a better bridging between Al2O3 particles. The use of dextrin at low dosages proved to be efficient in thestabilization of aqueous alumina suspensions.

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