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- 저자 : P. Kuschel (검색결과 1 건)
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Adsorption studies on nano-zirconia in water and a water-1,2-propanediol mixture
C. Renger,P. Kuschel,A. Kristoffersson,B. Clauss,W. Oppermann,W. Sigmund 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.2
The adsorption of an electrosteric (polyacrylic acid, PAA), an electrostatic (triammonium citrate, TAC) and a steric dispersant (2-(2-(2 methoxy ethoxy) ethoxy)acetic acid, TODA) onto nanozirconia particles in deionized (d.i.) water and in a 75 wt% water-25 wt% 1,2-propanediol mixture was investigated. The amount of dispersant in d.i. water yielding the lowest apparent viscosity was measured via rheology. For PAA this was determined to be 6 wt%, for TAC 2 wt% (which corresponds to ≈ 0.43 mg/m2) and for TODA also 2 wt% (corresponding to ≈ 0.34 mg/m2). In the water-propanediol mixture the minimum viscosity was measured and the adsorbed amount was determined by adsorption isotherms using the depletion method. For TAC this was ≈ 0.076 mg/m2, which is five times less than the value in pure water. Furthermore, zeta-potential measurements were performed to confirm the dispersion mechanism. Zirconia particles in water showed the same zeta-potential as in waterpropanediol, although in water-propanediol less TAC molecules were adsorbed on the surface. For TODA the adsorbed amount was calculated to be ≈ 0.4 mg/m2, which fits well to the value determined in water. Propanediol seems not to influence the adsorption in that case.
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