PAM溶液中合成核/壳结构花生状碳酸钙粒子  

Synthesis of Core/Shell Calcium Carbonate Peanut-like Assemblies in Polyacrylamide Aqueous Solution

作　　者：蒋锡华[1] 郑明波[1] 陈惠钦[1] 潘力佳[1] 陶杰[1] 曹洁明[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院纳米材料研究所,南京210016

出　　处：《无机材料学报》2008年第6期1283-1286,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(50502020);江苏省自然科学基金(BK2006195)

摘　　要：在聚丙烯酰胺(PAM)溶液中,通过单一聚合物调控CaCO_3晶体生长,制备了核/壳结构的花生状CaCO_3粒子.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线粉末衍射(XRD)对合成样品的形貌、结构进行了表征.结果显示,花生状CaCO_3粒子的外壳由菱形的方解石组成,核由小粒子组成的短棒状粒子串组成,并形成由里向外的放射性状结构,核中间还具有较大体积的空腔.利用分形生长机理解释了粒子放射性结构的形成,并利用奥斯特瓦尔德熟化理论解释了核/壳结构的形成.Peanut-like CaCO3 assemblies with core-shell structure were obtained in polyacrylamide aqueous solution.The as-prepared products were characterized by scanning electron microscope（SEM）, transmission electron microscope（TEM）,and X-ray diffraction（XRD）.The results indicate that the peanut-like CaCO3 assemblies has some hollows.The shell of the CaCO3 assemblies is composed of calcite rhombohedras,and the core of the CaCO3 assemblies is composed of rod-like aggregates which are assembled by small particles and the core has a radially outward growth structure.The radially outward structure of the core is explained by the fractal growth theory,and the formation of Core/Shell structure is explained by the Ostwald ripening theory.

关 键 词：核/壳结构 CACO3 分形生长 熟化理论 

分 类 号：O614[理学—无机化学]