Synthesis of calcium carbonate particles in octylamine/water bilayer systems

Jun Wang, William B. White, James H. Adair

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Calcium carbonate particles with various shapes and morphologies were prepared via precipitation in an octylamine/water self-assembly bilayer systems. Crystal structure and shape of the CaCO3 particles were determined by the water to octylamine molar ratio R of the bilayer. At R = 16.0, phase pure calcite particles with a "hopper crystal" morphology were formed, the average particle size of the hopper crystal is 10 μm with welldefined edges on the hopper faces. Decrease the R ratio to 7.2 eventually leads to the formation of 3 μm tabular CaCO3 particles which are predominated by vaterite structure. For an intermediate R of 10.8, spherical vaterite aggregates and rhombohedral calcite particles were produced. Thermal decomposition of the CaCO3 particles was observed at around 710°C. The mechanism of particle evolution in the self-assembly bilayer, particularly the formation of "hopper crystal" calcite was discussed.

Original languageEnglish (US)
Pages (from-to)156-162
Number of pages7
JournalKONA Powder and Particle Journal
Issue number1
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Engineering


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