Abstract
Controlling the particle-matrix interface of filled systems is generally an essential challenge for reaching target characteristics. Herein, a simple method is described to characterize and optimize the filler surface chemistry in the case of zirconia feedstocks using stearic acid as a surfactant. Our technique involves contact angle measurements by the sessile drop method between water and thermally treated zirconia powders mixed with stearic acid. It is shown that this is a powerful way to determine the optimum additive concentration and processing parameters. In addition, the effect of coated particles on the dynamic rheological behavior of the molten feedstock is investigated. Furthermore, the kinetics of the hydrophobization of the powder surface induced by esterification between the fatty acid and the adsorbed hydroxyls at the powder surface has been accurately followed.
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