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Adrián Zamorategui,Oscar Coreño,Julio Del Angel,Satoshi Tanaka 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
Nanofibers of gamma alumina were dispersed in acid aqueous media and the effect of hydrochloric and nitric acid on viscositywas investigated. The viscosities of the aqueous suspensions were determined under controlled shear rate conditions, varyingthe pH and solid concentration. A lower viscosity is observed with nitric acid because the nitrate ion produces stronger doublelayer repulsion, in comparison with that obtained with the chloride ion. It was found that the maximum solid loading in thesuspension at pH 4.5 adjusted with HNO3 and HCl was 42 and 35 wt%, respectively. The isoelectric point (IEP) of the aluminapowder in the suspension occurs at pH 8.5. High solid concentrations and a pH close to the IEP produced high viscosity andshear thinning at the low shear rates due to slurry agglomeration. This increases the viscosity of the suspension and diminishesthe final relative density of the slip casting body.