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首页> 外文期刊>Crystal growth & design >Phase Transformation from Brucite to Highly Crystalline Layered Double Hydroxide through a Combined Dissolution-Reprecipitation and Substitution Mechanism
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Phase Transformation from Brucite to Highly Crystalline Layered Double Hydroxide through a Combined Dissolution-Reprecipitation and Substitution Mechanism

机译：通过组合溶出 - 再沉淀和取代机构将Brucite从Brucite转化到高结晶层双氢氧化物

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摘要

We propose the phase transformation of magnesium hydroxide (brucite) to magnesium-aluminum hydroxide (layered double hydroxide: LDH) utilizing solid state brucite and aqueous aluminum(III) as precursors in order to obtain highly crystalline and large-sized LDH. Under a hydrothermal reaction at 150 degrees C, the brucite was partially dissolved, and aqueous aluminum precipitated in the form of boehmite within 1.5 h. Then, the precipitated aluminum migrated into the brucite framework to transform the crystal phase of brucite to LDH within 2.3 h of reaction. Time-dependent X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy analyses showed the time-dependent evolution of LDH from brucite. The transformed LDH exhibited crystal growth along the ab-plane direction first followed by crystal growth along the c-axis. Quantitative analysis utilizing inductively coupled plasma-optical emission spectroscopy for both the solid part and supernatant confirmed that the phase transformation was mediated by both dissolution-reprecipitation and isomorphous substitution in the solid state. The solid-state magic angle spin nuclear magnetic resonance spectroscopy for Al-27 indicated that the crystal growth of phase-transformed LDH was accompanied by local ordering around Al(III) in LDH.
机译：我们提出了利用固态布鲁铜和铝水溶液（III）作为前体的氢氧化镁（层状双氢氧化物：LDH）的氢氧化镁（Brucite）对氢氧化镁（层次的双氢氧化物：LDH）的相变化，以获得高晶体和大尺寸的LDH。在150℃下的水热反应下，熔化物部分溶解，水铝以1.5小时的致胶质矿的形式沉淀。然后，将沉淀的铝迁移到Brucite框架中以在反应的2.3小时内将Brucite的晶相转变为LDH。时间依赖性的X射线衍射，扫描电子显微镜和高分辨率透射电子显微镜分析显示了SPRUCITE的时间依赖性LDH。转化的LDH首先沿着Ab平面方向表现出晶体生长，然后沿着C轴进行晶体生长。用于固体部分和上清液的电感耦合等离子体 - 光发射光谱的定量分析证实了相变通过固态溶解 - 再沉淀和同性晶类介导的相变。用于Al-27的固态魔术角旋转核磁共振光谱表明相变化的LDH的晶体生长伴随着LDH中的Al（III）周围的局部排序。

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  • 来源
    《Crystal growth & design》 |2018年第9期|共8页
  • 作者

    Shin Jinseop; Choi Chan-Ju; Kim Tae-Hyun; Oh Jae-Min;

  • 作者单位

    Yonsei Univ Dept Chem &

    Med Chem Coll Sci &

    Technol Wonju 26493 South Korea;

    Yonsei Univ Dept Chem &

    Med Chem Coll Sci &

    Technol Wonju 26493 South Korea;

    Yonsei Univ Dept Chem &

    Med Chem Coll Sci &

    Technol Wonju 26493 South Korea;

    Yonsei Univ Dept Chem &

    Med Chem Coll Sci &

    Technol Wonju 26493 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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