Controlled crystallization of vaterite from viscous solutions of organic colloids
- Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4801 (US)
Precipitation of calcium carbonate from hydroxyethyl cellulose (HEC) containing aqueous solutions of CaCl{sub 2} and Na{sub 2}CO{sub 3} resulted in an uncommon polymorph, vaterite. In contrast to precipitations without HEC, crystallization in the presence of HEC led to a shell-shaped body consisting of organized vaterite platelets. The artificial shell is a composite of stacks of vaterite and about 2% HEC. In the experimental arrangement used, HEC controlled both nucleation and crystal growth of vaterite. Concentration of HEC also affected the platelet's thickness which in turn influenced the shell's morphology as well. These results demonstrate the importance of organic-inorganic interface in controlling crystallization.
- DOE Contract Number:
- FG02-85ER45204
- OSTI ID:
- 6258530
- Journal Information:
- Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 5:12; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALKYL RADICALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBOHYDRATES
CARBON COMPOUNDS
CARBONATES
CELLULOSE
CRYSTALLIZATION
ETHYL RADICALS
GROWTH
HYDROXY COMPOUNDS
NUCLEATION
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLYSACCHARIDES
RADICALS
SACCHARIDES