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Heterogeneous Nucleation of Calcium Oxalate on Native OxideSurfaces

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 beenstudied as a model system for understanding heterogeneous nucleationprocesses of importance in biomimetic synthesis of ceramic thin films.Calcium oxalate nucleation has been monitored by measuring induction timesfor nucleation using Constant Composition techniques and by measuringnucleation densities on extended oxide surfaces using an atomic forcemicroscope. Results show that the dependence of calcium oxalate nucleationon solution supersaturation fits the functional form predicted by classicalnucleation theories. Anionic surfaces appear to promote nucleation betterthan cationic surfaces, lowering the effective energy barrier toheterogeneous nucleation.

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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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