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Rheological Monitoring of Gelation Kinetics of Siuca Sols

Published online by Cambridge University Press:  25 February 2011

S. A. Khan ,
E. M. Rabinovich ,
R. K. Prud'homme ,
M. J. Sammon  and
N. J. Kopylov
S. A. Khan
Affiliation:
Bell Communications Research, Red Bank, NJ 07701
E. M. Rabinovich
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
R. K. Prud'homme
Affiliation:
Princeton University, Princeton, NJ 08540
M. J. Sammon
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
N. J. Kopylov
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
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Abstract

Dynamic oscillatory measurements at low strains are used to monitor the gelation kinetics of particulate aqueous sols composed of alkoxide-derived silica powders. The dynamic storage modulus is sensitive to the sizes of the growing clusters below the gel point. A transition in the modulus is observed and large normal forces are measured at the gel point. These tests do not disrupt gel structure (in contrast to shear viscosity measurements) and therefore the measurement process does not alter the gelation kinetics. To facilitate gelation of sols composed of low-surface area silica particulates, silica powders doped with F ions were added to the undoped powder in various concentrations (10, 15 and 20 wt.%). These additions allowed a change in gelation time from 80 min. (for 10% of the F containing powder) to 17 min. (for 20%).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 73
Copyright
Copyright © Materials Research Society 1988

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References

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