Heterogeneous nucleation of calcium oxalate on native oxide surfaces
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.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States); Washington State Univ., Pullman, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830; FG06-89ER75522
- OSTI ID:
- 10182535
- Report Number(s):
- PNL-SA-23282; CONF-9404213-1; ON: DE94018725; TRN: 94:020139
- Resource Relation:
- Conference: Monitored retrievable storage spring meeting,San Francisco, CA (United States),4-8 Apr 1994; Other Information: PBD: Apr 1994
- Country of Publication:
- United States
- Language:
- English
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