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Acidic Biopolymers as Dispersants for Ceramic Processing

Published online by Cambridge University Press:  15 February 2011

N. Pellerin,
J. T. Staley,
T. Ren,
G. L. Graff,
D. R. Treadwell and
I. A. Aksay
N. Pellerin
Affiliation:
Department of Microbiology, Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
J. T. Staley
Affiliation:
Department of Microbiology, Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
T. Ren
Affiliation:
Department of Microbiology, Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
G. L. Graff
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
D. R. Treadwell
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
I. A. Aksay
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Center, University of Washington, Seattle, WA 98195
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Abstract

Some acidic biopolymers serve as dispersants for colloidal processing of ceramics. One biopolymer we tested was alginate, a heteropolysaccharide containing two carboxylic sugar acids, D-mannuronic and D-guluronic. Kelp alginate was a suitable dispersant, provided that its viscosity was reduced by partial acid hydrolysis. Low molecular weight polymers rich in guluronic acid proved to be better dispersants than those rich in mannuronic acid, perhaps due to their greater charge density caused by their buckled molecular configuration. In situ processing of ceramic materials was tested by growing the alginate-producing bacterium, Azotobacter vinelandii, in the presence of alumina particles. Growth occurred at 15 vol% alumina in medium. Alumina particles which were exposed to such treatment showed a high packing density comparable to that with purified polymer. We also tested polypeptide polymers of the dicarboxylic amino acids, glutamate and aspartate, which also served as excellent dispersants for small alumina particles.

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References

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