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1 International Journal of Applied Mechanics and Engineering

1 2003

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Rheology of concentrated suspensions of plasma-processed fine alumina

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Jakobsons E. , Faitelson L. , Palcevskis E.

2003

tom Vol. 8, no spec.

251-258

The rheological properties (flow curves and viscoelastic behavior) of the injection-moulded suspensions prepared from two nanosized plasma-processed Al2O3 powders and water were investigated on wide ranges of shear rates and frequencies . Tiron (disodium salt of 4,5-dihydroxy-1,3-benzene-disulfonic acid) was chosen as a surfactant for preparation of the concentrated alumina suspensions. It is stated that, at an optimal Tiron content in suspensions, their viscosity, yield stress, and complex shear modulus have minimal values. A correlation was shown to exist between the optimal concentration of the dispersant obtained by rheological tests on the alumina powder water suspensions and the mentioned optimal concentration determined by measuring the zeta potential.