非经典和经典结晶：纺锤形 CaCO3 的形成，上面覆盖着丰富的纳米级菱形方解石亚基,Crystal Growth & Design

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非经典和经典结晶：纺锤形 CaCO3 的形成，上面覆盖着丰富的纳米级菱形方解石亚基
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2023-05-10 , DOI: 10.1021/acs.cgd.2c01511
Liqiu He ₁ , Shuyi Mo ₁ , Ling Sun ₁ , Wenqian Luo ₁ , Jilin Wang ₁ , Nan Tian ₁ , Jinyun He ₁ , Zhengguang Zou ₁ , Fei Long ₁

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碳酸钙 (CaCO ₃ ) 作为一种必需的无机材料，是自然界中含量最丰富的矿物质之一，其通过碳酸化制备氢氧化钙 [Ca(OH) ₂ ] 悬浮液由于气体的存在而涉及复杂的物理和化学过程–固液相。_{准确预测 CaCO 3}的最终形态具有挑战性。在本文中，通过碳化法制备了一种新型的纺锤形 CaCO ₃，上面覆盖着大量纳米级菱形方解石亚基。这种结构主要是由纳米粒子在反应前阶段聚集形成的，在反应后期转变为经典的离子-离子生长过程。在预反应期间，固体 Ca(OH) ₂保持溶液过饱和并使纳米颗粒的聚集占主导地位并组装形成 CaCO ₃的纳米链。随后，纳米链的聚集形成哑铃形，伴随着聚集体内部纳米粒子的再结晶，形成有序的单晶纺锤体结构。_{最后，Ca(OH) 2}的浓度降低，纺锤体CaCO ₃表面生长出一层纳米级的菱形方解石亚基。这项工作将为工业制备具有受控形态的 CaCO ₃提供新的见解，并有助于理解水溶液中基于聚集的生长的生物矿化。

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Nonclassical and Classical Crystallization: The Formation of Spindle-Shaped CaCO3 Covered with Abundant Nanoscale Rhombic Calcite Subunits

As an essential inorganic material, calcium carbonate (CaCO₃) is one of the most abundant minerals in nature, whose preparation by the carbonation of calcium hydroxide [Ca(OH)₂] suspension involves complex physical and chemical processes due to the presence of gas–solid–liquid phases. It is challenging to accurately predict the final morphology of CaCO₃. In this paper, a novel spindle-shaped CaCO₃ covered with a mass of nanoscale rhombic calcite subunits was prepared via the carbonation method. This structure was mainly formed by the aggregation of nanoparticles in the pre-reaction stage and turned into a classical ion–ion growth process at the stage of the late reaction. During the pre-reaction period, solid Ca(OH)₂ kept the solution supersaturated and made the aggregation of nanoparticles dominate and assemble to form the nanochains of CaCO₃. Subsequently, the aggregation of nanochains formed a dumbbell shape, which was accompanied by the recrystallization of nanoparticles inside aggregates to create an ordered single-crystal spindle structure. Finally, the concentration of Ca(OH)₂ decreased, and a layer of nanoscale rhombic calcite subunits grew on the surface of spindle CaCO₃. This work will provide new insights into the industrial preparation of CaCO₃ with controlled morphology and contribute to understanding the biomineralization of aggregation-based growth in aqueous solutions.

更新日期：2023-05-10

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