Effects of sodium dodecyl benzenesulfonic acid (SDBS) on the morphology and the crystal phase of CaCO3

Dae Ju Hwang, Kye Hong Cho, Moon Kwan Choi, Young Hwan Yu, Seung Kwan Lee, Ji Whwan Ahn, Gwang Il Lim, Choon Han, Jong Dae Lee

The effects of anionic surfactant on the morphology and crystallization of calcium carbonate precipitated from CaCl2 and Na2CO3 were investigated. Although reaction temperature did not have an effect on the morphology of calcium carbonate, it did have an effect on the cluster size. The cluster size became bigger with high reaction temperature. With the addition of sodium dodecyl benzenesulfonic acid (SDBS), the morphology of precipitated calcium carbonate changed from cubic to porous spheres with over 98% of the crystal phase transformed from calcite to vaterite. The analysis of precipitates formed by the reaction of CaCl2 solution (from limestone (CaO 50% content)) and Na2CO3 found that the morphology of precipitated calcium carbonate changed from cubic to spherical, and the crystal phase changed from calcite to over 94% vaterite with the addition of sodium dodecyl benzenesulfonic acid. These vaterite structures were solid spheres rather than hollow ones.

Keywords : Calcium Carbonate, Anionic Surfactants, Calcite, Vaterit,e Drug Delivery System