title: Crystallization and aggregation behaviors of calcium carbonate in the presence of poly(vinylpyrrolidone) and sodium dodecyl sulfate.
abstract: An anionic surfactant interacts strongly with a polymer molecule to form a self-assembled structure, due to the attractive force of the hydrophobic association and electrostatic repulsion. In this crystallization medium, the surfactant-stabilized inorganic particles adsorbed on the polymer chains, as well as the bridging effect of polymer molecules, controlled the aggregation behavior of colloidal particles. In this presentation, the spontaneous precipitation of calcium carbonate (CaCO3) was conducted from the aqueous systems containing a water-soluble polymer (poly(vinylpyrrolidone), PVP) and an anionic surfactant (sodium dodecyl sulfate, SDS). When the SDS concentrations were lower than the onset of interaction between PVP and SDS, the precipitated CaCO3 crystals were typically hexahedron-shaped calcite; the increasing SDS concentration caused the morphologies of CaCO3 aggregates to change from the flower-shaped calcite to hollow spherical calcite, then to solid spherical vaterite. These results indicate that the self-organized configurations of the polymer/surfactant supramolecules dominate the morphologies of CaCO3 aggregates, implying that this simple and versatile method expands the morphological investigation of the mineralization process.
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry of Education Ministry, School of Chemistry & Chemical Engineering, Shandong University, Ji'nan 250100, China. qshen@sdu.edu.cn
authors.forename: Qiang
authors.initials: Q
authors.lastname: Shen
authors.forename: Hao
authors.initials: H
authors.lastname: Wei
authors.forename: Liancheng
authors.initials: L
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Zhiqing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Dujin
authors.initials: D
authors.lastname: Wang
authors.forename: Guiying
authors.initials: G
authors.lastname: Xu
authors.forename: Duanfu
authors.initials: D
authors.lastname: Xu
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry*; D003460:Crystallization; D008854:Microscopy, Electron; D011205:Povidone / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*
chemical_list: D012967:Sodium Dodecyl Sulfate; D011205:Povidone; D002119:Calcium Carbonate