Shen Qiang, Wei Hao, Wang Liancheng, Zhou Yong, Zhao Ying, Zhang Zhiqing, Wang Dujin, Xu Guiying, Xu Duanfu
Key Laboratory for Colloid and Interface Chemistry of Education Ministry, School of Chemistry & Chemical Engineering, Shandong University, Ji'nan 250100, China.
J Phys Chem B. 2005 Oct 6;109(39):18342-7. doi: 10.1021/jp052094a.
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.
由于疏水缔合的吸引力和静电排斥力，阴离子表面活性剂与聚合物分子强烈相互作用形成自组装结构。在这种结晶介质中，吸附在聚合物链上的表面活性剂稳定的无机颗粒以及聚合物分子的桥连作用控制了胶体颗粒的聚集行为。在本报告中，碳酸钙（CaCO₃）从含有水溶性聚合物（聚乙烯吡咯烷酮，PVP）和阴离子表面活性剂（十二烷基硫酸钠，SDS）的水体系中自发沉淀。当SDS浓度低于PVP与SDS相互作用的起始浓度时，沉淀的CaCO₃晶体通常为六面体方解石；SDS浓度的增加导致CaCO₃聚集体的形态从花状方解石变为空心球形方解石，然后变为实心球形球霰石。这些结果表明，聚合物/表面活性剂超分子的自组织构型主导了CaCO₃聚集体的形态，这意味着这种简单通用的方法扩展了矿化过程的形态学研究。
