期刊
JOURNAL OF CRYSTAL GROWTH
卷 311, 期 4, 页码 1129-1135出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2008.12.044
关键词
Crystal morphology; Growth from water-in-oil emulsion; Calcium carbonate
Calcium carbonate has been precipitated from water-in-oil emulsions consisting of n-hexane/nonionic surfactant (Brij 30) and its mixture with cationic (DTAB) or anionic surfactant (SDS) to which calcium chloride and sodium carbonate were added. It was found that the surfactant kind and its amount can regulate the size, form and morphology of the precipitated particles. In case of nonionic surfactant the water/surfactant ratio is the most important parameter that allows to obtain small and regular calcium carbonate crystals. Addition of the DTAB results in different morphology of particles having the same crystal form, whereas addition of SDS changes the kind of emulsion from water-in-oil to oil-in-water. Moreover, light transmittance and backscattering light measurements have been used as a method to study the kinetics of calcium carbonate precipitation in emulsion systems. (C) 2008 Elsevier B.V. All rights reserved.
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