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Synthesis and shape evolution of monodisperse basic magnesium carbonate microspheres

机译：单分散碱性碳酸镁微球的合成与形貌演化

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摘要

A self-assembled spherical-like basic magnesium carbonate (Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O) with diameters of 15-17 mu m was synthesized in an aqueous solution system without using any organic additives during the precipitation process. Reaction parameters such as reaction time, stirring time, and reaction temperature were found to be important in controlling the final morphology of Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O. By the investigation of the particles from time-dependent experiments, scanning electron microscopy observations and Fourier transform infrared spectra indicate that the formation of these spherical-like Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O is via a complex process, in which the agglomerates built by many fine grains are first produced after the "burst" mixture of K2CO3 and Mg(NO3)(2) solutions. Then the agglomerates tend to assemble into needlelike or other similar particles, and the latter, due to their unstable properties from the thermodynamic point of view, will transfer into sheetlike particles, which further assemble into spherical-like particles. During such a process, their corresponding compositions also change from (MgCO3)(0.8)(Mg(OH)(2))(0.2)center dot 1.3H(2)O to MgCO3 center dot xH(2)O, then to Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O. In addition, the stirring time and reaction temperature were found to play a comparative role in determining the final morphology of Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O, and the morphology transition from spherical-like to nest-like, then to layered particles, as well as the decrease of particle size, can be well obtained by carefully adjusting the stirring time (0.5-4 min) of the initial solution and reaction temperature (333-363 K).
机译：在没有水溶液的水溶液体系中合成了直径为15-17μm的自组装球形碱性碳酸镁（Mg-5（CO3）（4）（OH）（2）中心点4H（2）O）在沉淀过程中使用任何有机添加剂。发现反应时间，搅拌时间和反应温度等反应参数对于控制Mg-5（CO3）（4）（OH）（2）中心点4H（2）O的最终形态至关重要。通过对与时间有关的实验中的颗粒进行研究，扫描电子显微镜观察和傅立叶变换红外光谱表明，这些球形Mg-5（CO3）（4）（OH）（2）中心点4H（2）的形成O是通过复杂的过程形成的，在该过程中，由许多细颗粒构成的附聚物首先在K2CO3和Mg（NO3）（2）溶液“爆发”混合后产生。然后，附聚物趋于组装成针状或其他类似的颗粒，并且后者由于从热力学的观点来看具有不稳定的性质，将转移成片状的颗粒，然后进一步组装成球形的颗粒。在此过程中，它们的相应组成也从（MgCO3）（0.8）（Mg（OH）（2））（0.2）中心点1.3H（2）O变为MgCO3中心点xH（2）O，然后变为Mg -5（CO3）（4）（OH）（2）中心点4H（2）O。此外，发现搅拌时间和反应温度在确定Mg-5（CO3）（4）（OH）（2）中心点4H（2）O的最终形态以及从通过仔细调节初始溶液的搅拌时间（0.5-4分钟）和反应温度（333-363 K），可以很好地获得球形到巢状，然后到层状的颗粒以及颗粒尺寸的减小）。

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