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首页> 外文期刊>Chemistry: A European journal >Control over Calcium Carbonate Phase Formation by Dendrimer/Surfacant Templates
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Control over Calcium Carbonate Phase Formation by Dendrimer/Surfacant Templates

机译：树状聚合物/表面活性剂模板控制碳酸钙相的形成

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摘要

Poly(propylene imine) dendrimers that are modified with long alkyl chains self-assemble to form well-defined aggregates. The geometry and surface chemistry of the dendrimer assemblies can be varied through the addition of surfactants. The geometry and surface chemistry of the dendrimer as-semblies can be varied through the addition of surfactants. These dendrimer/surfactant aggregates can be tuned to template the formation of the different phases of calcium carbonate. The use of octadecylamine results in the formation of polyhedral aggregates that become embedded within an amorphous calcium carbonate phase that persists in competition with the thermodynamic product, calcite. In combination with hexadecyl-trimethylammonium bromide, small spherical aggreates are formed that induce the formation of vaterite. The use of the negatively charged surfactant SDS results in growth retardation by the Ca~(2+)-induced agglomeration of the drimer/surfactant aggregates into giant spherical particles. Eventually these particles become overgrown by rhombohedral calcite.
机译：用长烷基链修饰的聚丙烯亚胺树状聚合物自组装形成明确的聚集体。树枝状聚合物组件的几何形状和表面化学性质可通过添加表面活性剂来改变。树枝状聚合物组合的几何形状和表面化学性质可通过添加表面活性剂来改变。可以调节这些树状聚合物/表面活性剂聚集体，以模板化碳酸钙不同相的形成。十八烷基胺的使用导致形成多面体聚集体，该多面体聚集体包埋在无定形碳酸钙相中，该相持续与热力学产物方解石竞争。与十六烷基三甲基溴化铵结合在一起，会形成小的球形聚集物，从而引起球ate石的形成。带负电荷的表面活性剂SDS的使用会导致Ca_（2+）引起的干燥剂/表面活性剂聚集体团聚成巨大的球形颗粒，从而导致生长延迟。最终，这些颗粒被菱形方解石长满。

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