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首页> 外文期刊>Advanced Materials >Stable Amorphous CaCO_3 Microparticles with Hollow Spherical Superstructures Stabilized by Phytic Acid
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Stable Amorphous CaCO_3 Microparticles with Hollow Spherical Superstructures Stabilized by Phytic Acid

机译：植酸稳定的具有空心球超结构的稳定非晶态CaCO_3微粒

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In recent years, bio-inspired morphosyntheses that mimic the mineralization process of biominerals, such as calcium carbonate, silica, magnetic iron oxide, and calcium phosphate, of exquisite morphologies with structural and functional values, have received much attention.'1' CaCO3 is one of the standard model systems because of its abundance in Nature and its important industrial applications. Biomimetic formation of CaCO3 in the presence of organic templates and/or additives has been extensively investigated.'21 CaCO3 has three anhydrous crystalline polymorphs: vaterite (the least stable), aragonite, and calcite (the most stable). In addition, three metastable forms: amorphous calcium carbonate (ACC), crystalline monohydrate CaCO3, and hexahydrate CaCC>3, have also been reported.'1'1'31 The ACC types that have been identified so far can be divided into two basic categories; the hy-drated form that contains one mole of water for every mole of CaCO3, and the transient precursor form that is essentially anhydrous. Both forms are unstable, but the former is relatively stable compared to the latter.'3' ACC in its pure form is the least stable phase and transforms readily into one of the crystalline polymorphs.'4"6' It is now well documented that Nature often uses amorphous material as a transient precursor for more stable crystalline aragonite and calcite. Biogenic single crystals of CaCO3 are often formed by the transformation of amorphous CaCO3.'3'71 An amorphous form of CaCO3 hydrate can be obtained in vitro from a highly supersaturated solution.'8' ACC can be stable in the dried state, but in aqueous solution it crystallizes into crystalline phases within hours.'41 ACC is metastable and rapidly transforms into crystalline CaCO3 unless it is stabilized by specific additives. In this respect, it is particularly interesting to note that liquid CaCO3 droplets were reported in the presence of poly(acrylic acid) or poly(aspartic acid), which is often termed the polymer-induced liquid precursor (PILP) process.
机译：近年来，模仿具有结构和功能价值的精美形态的生物矿物（例如碳酸钙，二氧化硅，磁性氧化铁和磷酸钙）的矿化过程受到了生物启发的形态合成.'1'CaCO3是由于其在自然界中的丰富性及其重要的工业应用，因此成为标准模型系统之一。已经广泛研究了在有机模板和/或添加剂的存在下仿生形成CaCO3的情况。21CaCO3具有三种无水结晶多晶型物：ate石（最不稳定），文石和方解石（最稳定）。此外，还报道了三种亚稳形式：无定形碳酸钙（ACC），结晶一水合物CaCO3和六水合物CaCC>3。'1'1'31到目前为止已确定的ACC类型可分为两种类别；每摩尔CaCO3含有一摩尔水的水合形式，以及基本上是无水的瞬态前体形式。两种形式都是不稳定的，但是前者相对于后者是相对稳定的。纯净形式的“ 3” ACC是最不稳定的相，很容易转变为一种结晶多晶型物。“ 4” 6”现已被充分证明大自然通常使用非晶态材料作为过渡的前体来获得更稳定的结晶文石和方解石，而CaCO3的生物单晶通常是通过非晶态CaCO3的转化而形成的。'3'71可以从体外从高浓度的碳酸钙中获得非晶态的CaCO3水合物。 '8'ACC在干燥状态下可以保持稳定，但在水溶液中它会在数小时内结晶成结晶相。'41ACC是亚稳态的，除非被特定的添加剂稳定，否则它会迅速转变为CaCO3结晶。特别有趣的是，据报道，液态碳酸钙液滴是在聚丙烯酸或聚天冬氨酸的存在下产生的，聚丙烯酸通常称为聚合物诱导的液体前体（PILP）。 ）过程。

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  • 来源
    《Advanced Materials》 |2005年第18期|p. 2217-2221|共5页
  • 作者

    An-Wu Xu; Qiu Yu; Wen-Fei Dong; Markus Antonietti; Helmut Colfen;

  • 作者单位

    Max Planck Institute of Colloids and Interfaces, MPI Research Campus Golm, D-14424 Potsdam, Germany;

    School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China;

    Max Planck Institute of Colloids and Interfaces, MPI Research Campus Golm, D-14424 Potsdam, Germany;

    Max Planck Institute of Colloids and Interfaces, MPI Research Campus Golm, D-14424 Potsdam, Germany;

    Max Planck Institute of Colloids and Interfaces, MPI Research Campus Golm, D-14424 Potsdam, Germany;

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  • 中图分类 工程材料学;
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