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Factors Affecting Strength of Agglomerates Formed During SprayDrying of Nanophase Powders

Published online by Cambridge University Press:  21 February 2011

A. Maskara  and
D.M. Smith
A. Maskara
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque NM 87131
D.M. Smith
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque NM 87131
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Abstract

Nanosized silica particles dispersed in various solvents were spray driedand the change in size distribution, agglomerate strength, and strengthdistribution was determined. The effect of solvent surface tension, pH, andparticle surface chemistry on strength of agglomerates formed during spraydrying was studied for particle sizes between 15 and 500 nm. Alcohol/watermixtures having different surface tension, and water at different pH levels,were employed to separate the effects of capillary pressure and surfacehydroxyl condensation reactions. The agglomerate strength was determinedusing an ultrasonic measurement technique. The particle size was determinedusing sedimentation. The strength and strength distribution of agglomerateswas found to depend on the solvent surface tension, solubility (pH), andprimary particle size.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 637
Copyright
Copyright © Materials Research Society 1998

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References

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