Atchudan Raji, Lone Nasreena, Joo Jin
School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1958-1964. doi: 10.1166/jnn.2018.14208.
Calcium carbonate (CaCO3) and monodisperse calcium oxide nanoparticles (CaO NPs) are prepared by the calcination of solid-state calcium oleate precursor in air condition. The effect of calcination temperature on the synthesis of CaCO3 and CaO NPs is examined. The polymorphism is confirmed by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The sample morphologies including their size and size distribution are investigated by field emission scanning electron microscopy (FESEM). Calcination of calcium oleate between 400 and 550 °C results in CaCO3 NPs with mean sizes from 82 to 98 nm, whereas monodisperse spherical CaO NPs are obtained at 650 °C and an average size is estimated to be 40 nm. Beyond 650 °C, the size of CaO NPs increases with broad size distribution. The results of this study provide a novel approach to monodisperse CaCO3 and CaO NPs that can be applied in a variety of fundamental and industrial fields.
通过在空气中煅烧固态油酸钙前驱体制备碳酸钙（CaCO₃）和单分散氧化钙纳米颗粒（CaO NPs）。研究了煅烧温度对CaCO₃和CaO NPs合成的影响。通过X射线衍射光谱（XRD）、傅里叶变换红外光谱（FTIR）和热重分析（TGA）确认了多晶型。用场发射扫描电子显微镜（FESEM）研究了样品的形态，包括其尺寸和尺寸分布。在400至550℃之间煅烧油酸钙会得到平均尺寸为82至98nm的CaCO₃ NPs，而在650℃时可获得单分散球形CaO NPs，估计平均尺寸为40nm。超过650℃，CaO NPs的尺寸会增大且尺寸分布变宽。本研究结果为可应用于各种基础和工业领域的单分散CaCO₃和CaO NPs提供了一种新方法。
