摘 要：主要进行了超重力法制备纳米碳酸钙及纳米碳酸钙 的表面改性工作‚并应用 T EM、BET、XPS 和接触角等方法 对改性前后的纳米碳酸钙进行了分析和表征。未改性纳米 碳酸钙的粒径约为30nm‚而改性之后粒子的粒径约在35～ 40nm 之间；未改性纳米碳酸钙的比表面积为29．8m²／g‚改 性碳酸钙的比表面积38．4m²／g‚有较大程度的增大；改性碳 酸钙的 XPS 能谱图中 Ca^2＋的结合能改变了0．35eV‚表明改 性剂以化学键结合于碳酸钙表面；改性剂加入量在6％（质 量分数）时改性 CaCO₃ 与极性溶剂的接触角发生反转‚说明 改性剂适宜加入量应在6％左右。 

关键词：纳米碳酸钙；制备；表面改性；表征

Abstract：T he preparation of nano-sized CaCO₃ by high gravity method and the surface modification of such made nano-sized CaCO₃ are investigated．T he morphology and the dispersion of 18·Experimental Research· China Powder Science and Technology2001No．5 the particles were characterized by T EM‚BET techniques．T he rusults showed that the mean size of modified nano-sized CaCO₃is35～40nm and itʾs BET area is 38．4m²／g‚which is larger about 30％ than that of unmodified nano-sized CaCO₃．Accord ing to the difference of 2 p orbital electron energy of Ca in XPS after being modified‚it can be inferred that modifier chemical combines to CaCO₃surface through the chemical bond．T he val ue of contact angle of powder of modified CaCO₃in polar solvent reaches maximum value when the ratio of modifier to CaCO₃（by weight）is about 6％‚which indicated that optimum amount of modifier in around6％． 

Keywords： nano-sized calcium carbonate；preparation；surface modification；characterization