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Heterogeneous Nucleation of Calcium Oxalate on Native Oxide Surfaces

Published online by Cambridge University Press:  21 February 2011

Lin Song ,
Michael J. Pattillo ,
Gordon L. Graff ,
Allison A. Campbell  and
Bruce C. Bunker
Lin Song
Affiliation:
Pacific Northwest Laboratory(a), Materials Sciences Department, Richland, WA 99352
Michael J. Pattillo
Affiliation:
Pacific Northwest Laboratory(a), Materials Sciences Department, Richland, WA 99352
Gordon L. Graff
Affiliation:
Pacific Northwest Laboratory(a), Materials Sciences Department, Richland, WA 99352
Allison A. Campbell
Affiliation:
Pacific Northwest Laboratory(a), Materials Sciences Department, Richland, WA 99352
Bruce C. Bunker
Affiliation:
Pacific Northwest Laboratory(a), Materials Sciences Department, Richland, WA 99352
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Abstract

The aqueous deposition of calcium oxalate onto colloidal oxides has been studied as a model system for understanding heterogeneous nucleation processes of importance in biomimetic synthesis of ceramic thin films. Calcium oxalate nucleation has been monitored by measuring induction times for nucleation using Constant Composition techniques and by measuring nucleation densities on extended oxide surfaces using an atomic force microscope. Results show that the dependence of calcium oxalate nucleation on solution supersaturation fits the functional form predicted by classical nucleation theories. Anionic surfaces appear to promote nucleation better than cationic surfaces, lowering the effective energy barrier to heterogeneous nucleation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 223
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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