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Role of organic solvents and surface-active agents in the sol-emulsion-gel synthesis of spherical alumina powders

Published online by Cambridge University Press:  31 January 2011

M. Chatterjee ,
M. K. Naskar ,
B. Siladitya  and
D. Ganguli
M. Chatterjee
Affiliation:
Sol-Gel Division, Central Glass and Ceramic Research Institute, Calcutta 700 032, India
M. K. Naskar
Affiliation:
Sol-Gel Division, Central Glass and Ceramic Research Institute, Calcutta 700 032, India
B. Siladitya
Affiliation:
Sol-Gel Division, Central Glass and Ceramic Research Institute, Calcutta 700 032, India
D. Ganguli
Affiliation:
Sol-Gel Division, Central Glass and Ceramic Research Institute, Calcutta 700 032, India
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Extract

Spherical alumina particles were prepared following the sol-emulsion-gel method by systematic variation of (i) the concentration of the surfactant Span 80 above or below the critical micelle concentration (CMC) in different organic solvents and (ii) hydrophilic–lipophilic balance (HLB) of different surfactants in cyclohexane. The experimentally determined CMC of Span 80 was found to increase with increasing dielectric constant of the organic solvent, influencing the sol droplet and alumina particle size. With an increase in the HLB value of the surfactants, the tendency of monodispersed sphere formation among the particles increased with a decrease in the size distribution and average particle size (d50).

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 176 - 185
Copyright
Copyright © Materials Research Society 2000

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References

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