超疏水纳米碳酸钙的制备与表征
Preparation and characterization of ultra-hydrophobic calcium carbonate nanoparticles
摘要：
基于脂肪酸的阴离子表面活性剂通常用于改性CaCO $_3$的颗粒表面性质，目的是增强其分散性和与聚合物基质的相容性。在这项研究中，油酸钠用于使用湿碳酸化路线制备超疏水性CaCO $_3$纳米颗粒。采用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、透射电镜（TEM）、Zeta电位、热重分析（TGA）和水接触角（WCA）等测试手段，研究了油酸钠对CaCO $_3$的性质、粒径、形貌、表面电位、热分解和疏水性的影响。结果表明，添加2 wt%的油酸钠可以使CaCO $_3$的粒径从2 μm左右减小到45 nm左右，并改善其疏水性能。
英文摘要：
Anionic surfactants based on fatty acids are usually used to modify the particle surface properties of CaCO$_3$ with the aim to enhance its dispersion and compatibility with polymer matrices. In this study sodium oleate was used for the preparation of ultra-hydrophobic CaCO$_3$ nanoparticles using a wet carbonation route. The effect of sodium oleate on the characteristics, particle size, morphology, surface potential, thermal decomposition and hydrophobicity of CaCO$_3$, was investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), Zeta potential, thermogravimetric analysis (TGA) and water contact angle measurement (WCA). The results showed that the addition of 2 wt% sodium oleate helps in reducing the particle size from 2 μm length scalenohedral particles to 45 nm rhombohedral particles and modifying of the hydrophobic property of CaCO$_3$.
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