Abstract Calcium carbonate (CaCO3) hollow microspheres of calcite polymorph were successfully obtained by using sodium carbonate (Na2CO3) and calcium nitrate (Ca(NO3)2) in the presence of poly (acrylic acid) (PAA) and sodium dodecyl sulfonate (SDS). The morphologies and polymorphs of CaCO3 obtained were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), and then the effects of different temperature, PAA and SDS concentration on the morphology and polymorph of CaCO3 were investigated. Finally, the formation mechanism of CaCO3 hollow microspheres was studied carefully by the morphology and polymorph of CaCO3 microspheres in the preparation process. The results showed that the calcite CaCO3 hollow microspheres with the particle diameters of 4–7 μm could be prepared when the temperature was 80 ℃, PAA (Mw = 8000 g/mol) and SDS concentrations were 0.5 g/L and 10 mM, respectively. Meanwhile, PAA and SDS could affect the aggregation behavior and morphology of CaCO3 in the reaction process, then a novel formation mechanism of the CaCO3 hollow microspheres was proposed in this paper.

中文翻译：

---

碳酸钙空心微球的制备及形成机理

摘要 在聚丙烯酸（PAA）和十二烷基磺酸钠（SDS）存在下，以碳酸钠（Na2CO3）和硝酸钙（Ca（NO3）2）为原料，成功获得方解石多晶型碳酸钙（CaCO3）空心微球。 . 通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线衍射（XRD）对所得CaCO3的形貌和多晶型进行表征，然后考察不同温度、PAA和SDS浓度对CaCO3形貌和多晶型的影响。研究了 CaCO3。最后，通过制备过程中CaCO3微球的形貌和多晶型，仔细研究了CaCO3空心微球的形成机理。结果表明，当温度为 80 ℃、PAA（Mw = 8000 g/mol）和 SDS 浓度分别为 0.5 g/L 和 10 mM 时，可以制备粒径为 4~7 μm 的方解石 CaCO3 空心微球。 . 同时，PAA和SDS会影响CaCO3在反应过程中的聚集行为和形貌，提出了一种新型CaCO3空心微球的形成机理。