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首页> 外文期刊>Crystal growth & design >Biomimetic synthesis of calcium carbonate thin films using hydroxylated poly(methyl methacrylate) (PMMA) template
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Biomimetic synthesis of calcium carbonate thin films using hydroxylated poly(methyl methacrylate) (PMMA) template

机译：羟基化聚甲基丙烯酸甲酯（PMMA）模板仿生合成碳酸钙薄膜

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Morphosynthesis of calcium-rich materials by tuning the chemical structure of organic matrices has tremendous potential in the preparation of functional mineralized materials. In this paper, we have demonstrated the deposition of thin films of CaCO3 by subtle modifications of the backbone of poly(methyl methacrylate) (PMMA) by the incorporation of many hydroxyl groups. The water-insoluble hydroxylated PMMA (HyPMMA) was used as a template along with poly(acrylic acid) (PA) as an additive for CaCO3 mineralization. Thin film deposition was controlled by the addition of an appropriate amount of PA to the crystallization medium. At lower concentrations (PA = 50 and 100 mu g/mL), irregular aggregates of calcite crystallites were formed. As the concentration of PA was increased (500 mu g/mL and 1 mg/mL), calcite thin films were deposited. Time-dependent crystallization showed that the precipitates obtained after 3 h were biphasic in structure, consisting of both amorphous and crystalline domains. Observations suggest that crystal aggregates and thin films were formed through a multistep mechanism in which an amorphous phase was deposited initially and was subsequently transformed into stable crystalline form. In contrast, mineralization in the presence of HyPMMA or PA alone yielded only calcite or calcite aggregates. Our results indicate that a concerted interplay of interactions between the insoluble polymer matrix (HyPMMA) and soluble PA determines the growth and morphology of CaCO3 by influencing the transformation of amorphous calcium carbonate (ACC) into the crystalline phase. More specifically, we have investigated the interplay of the role of acid groups on PA and accelerating alcohol groups on HyPMMA in calcium carbonate crystallization.
机译：通过调节有机基质的化学结构来进行富钙材料的形态合成，在制备功能性矿化材料方面具有巨大潜力。在本文中，我们证明了通过引入许多羟基对聚甲基丙烯酸甲酯（PMMA）的骨架进行细微修饰，可以沉积CaCO3薄膜。将不溶于水的羟基化PMMA（HyPMMA）与聚丙烯酸（PA）用作模板，以作为CaCO3矿化的添加剂。通过向结晶介质中添加适量的PA来控制薄膜沉积。在较低的浓度（PA = 50和100μg / mL）下，形成了方解石微晶的不规则聚集体。随着PA浓度的增加（500μg / mL和1 mg / mL），方解石薄膜沉积。随时间变化的结晶表明，3 h后获得的沉淀物是双相结构，由非晶和晶畴组成。观察表明，晶体聚集体和薄膜是通过多步机制形成的，其中先沉积了非晶相，然后将其转变为稳定的晶体形式。相反，仅在HyPMMA或PA存在下矿化仅产生方解石或方解石聚集体。我们的结果表明，不溶性聚合物基质（HyPMMA）与可溶PA之间相互作用的相互作用相互作用，通过影响无定形碳酸钙（ACC）向结晶相的转化，决定了CaCO3的生长和形态。更具体地说，我们研究了碳酸钙结晶中PA上酸基和HyPMMA上醇基加速作用的相互作用。

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