A. Krell—contributing editor
Electrokinetic and Rheological Properties of Nano Zirconia in the Presence of Rhamnolipid Biosurfactant
Article first published online: 20 AUG 2008
© 2008 The American Ceramic Society
Journal of the American Ceramic Society
Volume 91, Issue 10, pages 3197–3201, October 2008
How to Cite
Biswas, M. and Raichur, A. M. (2008), Electrokinetic and Rheological Properties of Nano Zirconia in the Presence of Rhamnolipid Biosurfactant. Journal of the American Ceramic Society, 91: 3197–3201. doi: 10.1111/j.1551-2916.2008.02617.x
- Issue published online: 1 OCT 2008
- Article first published online: 20 AUG 2008
- Manuscript No. 24282. Received February 1, 2008; approved June 30, 2008.
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.