自组装片状纳米碳酸钙的制备及表面改性

Preparation and surface modification of self-assembled plate-shaped nanometer calcium carbonate

通过沉淀反应法,以有机质十八碳醇磷酸酯(ODP)作为添加剂,制备了一种新型的自组装片状纳米碳酸钙材料。所得产品通过X射线衍射(XRD)、场发射扫描电镜(FESEM)、傅里叶红外光谱(FTIR)、热重分析(TGA)、活化度和接触角等测试手段对其结构和性能进行了表征。实验结果表明,当ODP添加量为2.0%时,碳酸钙活化度可达到99.9%,接触角为123.8°,具有较好的疏水性。所以ODP的加入不仅可改变碳酸钙粒子的形貌,而且在碳酸钙晶体的结构和性能等方面起着重要调控作用。

Exquisite and unusual plate-shaped nanometer CaCO3 particles were successfully preparated through a facile precipitation reaction of Na2CO3 with CaCl2 in the presence of octadecyl dihydrogen phosphate（ODP）.The hydrophobic property of CaCO3 was revealed by active ratio and the contact angle tests.The products were characterized through a transmission electron microscope（FESEM）,X ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）and thermogravimetric analysis （TGA）.With 2.0% of ODP dosage,highly hydrophobic CaCO3 was obtained with active ratio of 99.9% and contact angle of 123.8°.The experimental results revealed that the addition of ODP had an effect on the control of morphology,structure and properties of CaCO3.