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Sedimentation in flocculating colloidal suspensions

Published online by Cambridge University Press:  03 March 2011

Jeffrey S. Abel ,
Gregory C. Stangle ,
Christopher H. Schilling  and
Ilhan A. Aksay
Jeffrey S. Abel
Affiliation:
School of Ceramic Engineering and Sciences, New York State College of Ceramics at Alfred University, Alfred, New York 14802
Gregory C. Stangle
Affiliation:
School of Ceramic Engineering and Sciences, New York State College of Ceramics at Alfred University, Alfred, New York 14802
Christopher H. Schilling
Affiliation:
Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
Ilhan A. Aksay
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
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Abstract

A combined experimental and theoretical investigation of the sedimentation of unstable colloidal ceramic suspensions has been performed. Suspensions containing submicron-sized α-Al2O3 particles were prepared at various pH values in order to modify suspension stability. Particle volume fraction during sedimentation was determined as a function of position and time by gamma-ray densitometry. A population balance model was developed to account for various coagulation and decoagulation mechanisms that affect sedimentation behavior in flocculating suspensions. Model predictions were then compared with experimental measurements, in order to establish the validity of the theoretical model.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 451 - 461
Copyright
Copyright © Materials Research Society 1994

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