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Oriented crystallization of CaCO3 under compressed monolayers. Part 2. - Morphology, structure and growth of immature crystals

Citation

Heywood, BR and Rajam, S and Mann, S, Oriented crystallization of CaCO3 under compressed monolayers. Part 2. - Morphology, structure and growth of immature crystals, Journal of the Chemical Society - Faraday Transactions, 87, (5) pp. 735-734. ISSN 0956-5000 (1991) [Refereed Article]

Copyright Statement

Royal Society of Chemistry 2015

DOI: doi:10.1039/FT9918700735

Abstract

The crystallization of CaCO3 under compressed Langmuir monolayers of stearic acid [CH3(CH2)16CO2H], octadecylamine [CH3(CH2)17NH2], octadecanol [CH3(CH2)17OH] and cholesterol (C27H45OH) has been studied over a range of supersaturation conditions by optical and scanning electron microscopy and X-ray diffraction. At total [Ca]= 9 mmol dm3, negatively charged stearate monolayes induced the oriented nucleation of calcite. The crystals were of two related morphological types, one of which was formed through the physical realignment of the oriented crystals at the organic surface during growth. Reducing the total [Ca] to 4.5 mmol dm3, resulted in oriented vaterite nucleation on the stearate monolayers. Vaterite was the major product on positively charged octadecylamine films, independent of [Ca]. Unlike the vaterite crystals of stearate films, these crystals were of two distinct morphological forms which represented two specific nucleation orientations. Neutral monolayers of octadecanol inhibited crystallization and those of cholesterol gave random non-oriented calcite deposition analogous to the control experiments. Morphological analyses indicated that the crystals were oriented with their [11.0](calcite) and [00.1] and [11.0](vaterite) axes perpendicular to the monolayer surface.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Physical Chemistry (incl. Structural)
Research Field:Structural Chemistry and Spectroscopy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Heywood, BR (Professor Brigid Heywood)
ID Code:104360
Year Published:1991
Web of Science® Times Cited:145
Deposited By:Research Division
Deposited On:2015-11-10
Last Modified:2015-12-18
Downloads:0

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