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Effect of Aging on Electrophoretic Behavior of Sol-Gel Derived Aluminas

Published online by Cambridge University Press:  15 February 2011

Burtrand I. Lee  and
Larry L. Hench
Burtrand I. Lee
Affiliation:
Ceramics Division, Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
Larry L. Hench
Affiliation:
Ceramics Division, Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
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Abstract

Sample alumina powder prepared with the procedures described by Yoldas [1,2] was suspended in 10−3 M NaCl and contained in precleaned polypropylene cups with air tight lids. Electrophoretic mobilities of the samples were measured at various pH's using a microelectrophoretic technique. The points of zero charge (PZC) were determined from plots of electrophoretic mobility vs pH of the sample suspensions. The initial values of PZC are 10.6 for γ-A12O3. and 8.3 for αAl-2O3 , The corresponding BET surface areas are 206 m2/g and 3m2/g respectively. Upon aging, the PZC decreased in 2 days and then increased by reaching maximum values of 10.4 for γ-Al2 O3 and 8.8 for α-Al2 O3 in 20 days. Aging of sol-gel derived aluminas and commercial alumina derived by precipitation are compared and differences are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 32: Symposium B – Better Ceramics Through Chemistry I , 1984 , 307
Copyright
Copyright © Materials Research Society 1984

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