Nano Archive

Electrokinetic and Rheological Properties of Nano Zirconia in the Presence of Rhamnolipid Biosurfactant

Biswas, Modhura and Raichur, Ashok. M. (2008) Electrokinetic and Rheological Properties of Nano Zirconia in the Presence of Rhamnolipid Biosurfactant. Journal of the American Ceramic Society, 91 (10). pp. 3197-3201.

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Official URL: http://www3.interscience.wiley.com/journal/1213836...

Abstract

In this paper, the effect of rhamnolipid biosurfactant on the electrokinetic and rheological behavior of nanozirconia particles is reported. The effect of pH, concentration of biosurfactant, and solids loading on ζ-potential and rheological behavior was investigated. ζ-potential measurements showed that adsorption of biosurfactant shifted the iso-electric point of zirconia with increasing biosurfactant concentration. The surface of zirconia became more electronegative in the presence of biosurfactant indicating a strong interaction. Maximum charge was obtained in the presence of about 230 ppm of biosurfactant. Rheological tests at pH 7 revealed that the zirconia suspension is viscous at high solids loading and addition of biosurfactant decreased the viscosity substantially especially at high solids loading (>50 wt%). Sedimentation tests confirmed that the biosurfactant is a good dispersant for zirconia particles at pH values of 7 and above.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Functional and hybrid materials
Biomedical Science > Nanobiotechnology
Material Science > Bio materials
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3928
Deposited By:JNCASR
Deposited On:27 Jan 2009 04:03
Last Modified:18 Apr 2009 11:40

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