Morphological control of calcium carbonate crystallized in reverse micelle system with anionic surfactants SDS and AOT

Hoon Kang Sung, Izumi Hirasawa, Woo Sik Kim, Kyun Choi Chang

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The influence of a surfactant over water on the polymorphism and crystal size of calcium carbonate produced by reaction crystallization in microemulsion systems was investigated in a mixing tank reactor. The crystallization was induced by the reaction between two aqueous micelle solutions (Na 2CO3-CaCl2) stabilized by anionic surfactants, SDS (sodium dodecyl sulfate) or AOT (sodium bis(2-ethylhexyl) sulfosuccinate). With increasing surfactant ratio to water, the water-in-oil microemulsion was stably developed and the morphology of the calcium carbonate crystallized in the micelles sharply transformed from calcite to vaterite. The influence of SDS on the polymorphism and crystal size of calcium carbonate was much clearer than that of AOT. In addition, with AOT, certain step changes in the morphology and crystal size occurred around a surfactant ratio to water (R=[H 2O]/[surfactant]) of 15 due to a two-phase separation of the microemulsion.

Original languageEnglish
Pages (from-to)496-502
Number of pages7
JournalJournal of Colloid And Interface Science
Volume288
Issue number2
DOIs
Publication statusPublished - 2005 Aug 15

Keywords

  • Calcite
  • Calcium carbonate
  • Microemulsion
  • Structural control
  • Vaterite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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