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首页> 外文期刊>Crystal growth & design >Crystallization of calcium carbonate mineral with hierarchical structures in DMF solution under control of poly(ethylene glycol)-b-poly(L-glutamic acid): Effects of crystallization temperature and polymer concentration
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Crystallization of calcium carbonate mineral with hierarchical structures in DMF solution under control of poly(ethylene glycol)-b-poly(L-glutamic acid): Effects of crystallization temperature and polymer concentration

机译：聚（乙二醇）-b-聚（L-谷氨酸）控制下在DMF溶液中具有分层结构的碳酸钙矿物的结晶：结晶温度和聚合物浓度的影响

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摘要

CaCO3 superstructures with complex forms and hierarchical surface textures were mineralized in the presence of peptide type block copolymer poly(ethylene glycol)-b-poly(L-glutamic acid) (PEG-b-pGlu) as a crystal growth modifier in dimethyl formamide (DMF) solution. Spindle-like CaCO3 crystals with a rather smooth surface and a size of 10 mu m in length and a maximum diameter of 6 mu m were mineralized at 24 +/- 2 degrees C. Unique ellipsoid-like CaCO3 particles with many similar thorns distributed on the particle surface formed when the mineralization temperature was kept at 14 +/- 2 degrees C. Complex column-like CaCO3 superstructures comprised of many tiny rods and irregular particles were observed at 4 +/- 2 degrees C. In addition, when the reagent concentration is varied, the morphology of CaCO3 changes from a mixture of spherical and ellipsoidal structures to a kind of complex ellipsoidal superstructure whose surface is attached by many hierarchical tubular structures, and then to a complex columnar structure, when the concentration of Ca2+ ions was varied from 40 to 20 mM and finally decreased to 10 mM, respectively. Correspondingly, phase transition occurred from a mixture of aragonite and calcite to pure calcite, and then to a mixture of vaterite and calcite when the mineralization temperature increased. Moreover, changing the polymer concentration resulted in phase transition from calcite to a mixture of aragonite and calcite, and then to a mixture of vaterite and calcite. An emergent self-organization process and its combination with an aggregated mechanism have been proposed for the formation of the complex ellipsoidal superstructures. The results imply that the specific biomimetic synthesis strategy in a nonaqueous solution can provide a useful pathway to produce inorganic or inorganic/organic hybrid materials with a unique morphology and specific textures.
机译：在二甲基甲酰胺中作为晶体生长调节剂的肽型嵌段共聚物聚（乙二醇）-b-聚（L-谷氨酸）（PEG-b-pGlu）的存在下，具有复杂形式和分层表面纹理的CaCO3超结构被矿化。 DMF）解决方案。在24 +/- 2摄氏度下矿化了具有相当光滑表面，长10微米，最大直径6微米的纺锤状CaCO3晶体。独特的椭球状CaCO3颗粒分布在许多类似的刺上当矿化温度保持在14 +/- 2摄氏度时，形成了颗粒表面。在4 +/- 2摄氏度下，观察到了由许多细小杆和不规则颗粒组成的复杂的柱状CaCO3上部结构。浓度变化时，CaCO3的形态从球形和椭球形结构的混合变为表面由许多分层管状结构连接的复杂椭圆形上部结构，然后随着Ca2 +离子浓度的变化而变为复杂的柱状结构。从40到20 mM，最后降至10 mM。相应地，当矿化温度升高时，从文石和方解石的混合物到纯方解石，然后到球v石和方解石的混合物发生相变。而且，改变聚合物浓度导致从方解石到文石和方解石的混合物，然后到球v石和方解石的混合物的相变。提出了一种新兴的自组织过程及其与聚集机制的结合，以形成复杂的椭圆形上层建筑。结果暗示在非水溶液中的特定仿生合成策略可以提供有用的途径来生产具有独特形态和特定质地的无机或无机/有机杂化材料。

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