期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 91, 期 10, 页码 3197-3201出版社
WILEY
DOI: 10.1111/j.1551-2916.2008.02617.x
关键词
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资金
- Council of Scientific and Industrial Research, Government of India
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 zeta-potential and rheological behavior was investigated. zeta-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.
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