以可溶性淀粉为晶型调控剂制备多孔球形碳酸钙

利用简单易行的复分解反应,以氯化钙和碳酸钠为合成试剂,以可溶性淀粉（SS）为晶型调控剂,制备出以球霰石晶型为主的碳酸钙多孔微球。通过单因素条件实验,分别考察可溶性淀粉添加量、碳酸钠溶液滴加速度、氯化钙与碳酸钠的物质的量比对碳酸钙形貌和晶型的影响。利用X射线衍射仪（XRD）,扫描电子显微镜（SEM）对其晶型、形貌进行表征。研究表明当SS添加量为0.5 g,滴加速度为1.5 mL/min,氯化钙与碳酸钠的物质的量比为1∶1时,可制备获得4~5 μm的多孔球霰石碳酸钙。

Preparation of porous spherical calcium carbonate with soluble starch as crystallization controller

Porous calcium carbonate microspheres with aragonite crystal form were prepared by simple double decomposition reaction,using calcium chloride and sodium carbonate as synthetic reagents and soluble starch（SS） as crystallization con-troller.Through the single-factor experiment,effects of the adding amount of soluble starch,the dropping speed of sodium carbonate solution,and the amount-of-substance ratio of calcium chloride to sodium carbonate on calcium carbonate morphology and crystal form were investigated.The crystal form and morphology were characterized by X-ray diffractometer（XRD） and scanning electron microscope（SEM）.The results showed that when the adding amount of SS was 0.5 g,the dropping speed was 1.5 mL/min,and the amount-of-substance ratio of calcium chloride to sodium carbonate was 1∶1,porous vaterite calcium carbonate with partical size of 4~5 μm could be prepared.