碳量子点诱导的多形碳酸钙粒子矿化及其形成机理

以在不同的热处理温度下合成的具有可变化学结构的碳点(CDs)为添加剂调控合成矿物碳酸钙。在室温条件下合成了花生状、哑铃状和球形碳酸钙颗粒。用扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)、荧光光谱仪(PL)和X射线衍射仪(XRD)对样品进行了表征,详细研究了碳酸钙双球粒子的生长过程。CDs表面随处理温度可调变的极性官能团(主要为羧基、醛基、羟基等)被认为是导致合成碳酸钙粒子形貌变化的原因。对碳酸钙双球粒子的生长机理研究表明,Ostwald成熟和定向聚集机制是在CDs存在下最终双球粒子形貌形成的驱动力。

CDs-Induced Polymorphous CaCO3 Mineralization and Formation Mechanism

Carbon dots (CDs) with various chemical structures can be obtained under the condition of different heat treat temperatures. The morphology and phase of CaCO₃ has been successfully controlled by the as-prepared CDs. Peanut-like, dumbbell-like and sphere-like particles were prepared in the presence of CDs. The CDs with changeable chemical structures, such as carboxyl group, aldehyde group, hydroxyl group, were deemed to be responsible for the variation in morphology. The as-obtained samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectrometer (FTIR), photoluminescence (PL) and X-ray diffraction (XRD). The growth mechanism of CaCO₃ twin sphere particles was investigated in detail. Ostwald ripening and oriented aggregation mechanisms were proposed to be the drive power of the final morphology formation in the presence of CDs.