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Insights into the Confined Crystallization in Microfluidics of Amorphous Calcium Carbonate

机译：无定形碳酸钙微流体中狭窄结晶的见解

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摘要

As a precursor phase, amorphous calcium carbonate (ACC) plays a key role in the formation of CaCO3 biominerals, but the detailed information about the structure evolution during the crystallization process of ACC is limited. Herein, based on the confined environment in microfluidics, we have demonstrated a strategy to investigate the crystallization processes of ACC. The characteristics of a confined environment in microfluidics were analyzed through COMSOL Multi physics simulations. By mixing equimolar CaCl2 and Na2CO3 aqueous solutions directly, the reactive crystallization of CaCO3 was monitored on chip by online microscope observation and micro Raman spectroscopy scanning. Combined with offline scanning electron microscopy characterization, we showed that branched aggregate ACC(I) precipitated first once mixing reactant solutions, then the more ordered and whiskerlike ACC(II) was an unexpected result. These whiskerlike ACC(II) either gradually transformed to spherical structure nanocrystalline, vaterite was then formed from it through spherulitic growth mechanism, or the initial rhombohedral crystallographic calcite was formed from whiskerlike ACC(II), then the complete rhombohedral calcite crystals formed through the dissolution/recrystallization of ACC(II). Our results showed an intuition-based way to directly observe the structure evolution of ACC crystallization in the confined environment; it could be of inspiration for the understanding of biomineralization processes.
机译：作为前体阶段，无定形碳酸钙（ACC）在形成CaCO3生物体的形成中起关键作用，但是关于ACC的结晶过程中的结构演化的详细信息受到限制。这里，基于微流体中的狭窄环境，我们已经证明了研究ACC的结晶过程的策略。通过COMSOL多物理模拟分析了微流体中狭窄环境的特征。通过直接混合等摩尔CaCl2和Na 2 Ca 2水溶液，通过在线显微镜观察和微拉曼光谱扫描在芯片上监测CaCO 3的反应性结晶。结合离线扫描电子显微镜表征，我们表明支链骨胚（I）首先沉淀一次混合反应物溶液，然后更令人有序，晶须符号（II）是意外结果。这些Whiskerlike Acc（II）逐渐转化为球形结构纳米晶体，然后通过球晶生长机制形成Vaterite，或者由粉底酮（II）形成初始的菱形晶体方解石，然后通过溶解形成完整的菱形方解石晶体/重结晶ACC（II）。我们的结果表明，直接遵守狭窄环境中ACC结晶的结构演变的直观方式;它可能是对生物矿化过程的理解的灵感。

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  • 来源
    《Crystal growth & design》 |2018年第11期|共9页
  • 作者

    Zeng Youpeng; Cao Jianwei; Wang Zhi; Guo Jianwei; Zhou Qiqi; Lu Jinshan;

  • 作者单位

    Chinese Acad Sci Inst Proc Engn Key Lab Green Proc &

    Engn Natl Engn Lab Hydromet Cleaner Prod Technol Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Proc Engn Key Lab Green Proc &

    Engn Natl Engn Lab Hydromet Cleaner Prod Technol Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Proc Engn Key Lab Green Proc &

    Engn Natl Engn Lab Hydromet Cleaner Prod Technol Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Proc Engn Key Lab Green Proc &

    Engn Natl Engn Lab Hydromet Cleaner Prod Technol Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Proc Engn Key Lab Green Proc &

    Engn Natl Engn Lab Hydromet Cleaner Prod Technol Beijing 100190 Peoples R China;

    Nanchang Hangkong Univ Sch Mat Sci &

    Engn Nanchang 330063 Jiangxi Peoples R China;

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  • 正文语种 eng
  • 中图分类 晶体学;
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