添加剂对纳米碳酸钙形貌与粒度的影响

采用碳化法和复分解法，通过选用不同添加剂及控制其添加量制备了不同形貌和粒径的纳米碳酸钙。用TEM、SEM对所得产物的形貌和尺寸进行了表征。结果表明，当柠檬酸的添加量为0.25%~0.75%（质量分数，下同）时，可实现对纳米碳酸钙颗粒粒径的调控，并选用硬脂酸钠作为表面改性剂对其进行改性，改性后的纳米碳酸钙颗粒更大，形状更规整，分散性更好；当季戊四醇添加量为0.1%~10%时，分别制备出了不同粒径的球形和立方形纳米碳酸钙颗粒。初步探讨了有机酸类、糖类和醇类对合成纳米碳酸钙的影响效果和作用机理。

Influence of additives on morphology and size of nano-sized calcium carbonate

Using carbonization method and double decomposition method，nano-sized calcium carbonate（CaCO₃） with different morphologies and sizes were prepared by selecting proper additives and controlling the amounts of added additives.The morphologies and sizes of products were characterized by TEM and SEM.Results showed that the control of the particle size of nano-sized CaCO₃ was realized by controlling the adding amounts of citric acid at 0.25%~0.75% （mass fraction，same below）.Moreover，the synthesized CaCO₃ was modified by sodium stearate and the modified sample particles became larger，more regular and homogeneous in shape，and better in disperse ability.Spherical and cubic nano-sized calcium carbonate with different particle sizes was obtained when the adding amounts of pentaerythritol were at 0.1%~10%.Moreover the influences and action mechanism of organic acids，sugars，and alcohols on the synthesis of nano-sized CaCO₃ were discussed.