中文摘要：

以蓝藻类的集胞藻6803为生物模板,用溶胶凝胶法合成了不同形貌的SiO2,并对集胞藻6803和所制SiO2进行了分析.建立了选择性合成单分散SiO2微球和空心SiO2的反应条件,探讨了不同形貌材料的形成机理.结果表明,形成的SiO2微球形貌规整,分散良好,粒径分布较窄,平均粒径为1.5μm,能保持细胞分裂阶段的原貌,呈无定型态.SiO2纳米粒子能均匀包覆在藻细胞表面,形成的空心SiO2微球壁厚均一,能保持藻细胞的形貌.证实了空心SiO2和SiO2微球形成机理是吸附和渗透过程不同.

英文摘要：

Silica particles with different morphologies were prepared using cyanobacteria Synechocystis sp.PCC 6803 as a biotemplate via a sol-gel route.The Synechocystis sp.PCC 6803 and as-prepared silica were characterized.The reaction conditions of selective synthesis of monodisperse silica and hollow silica microspheres were established.The formation mechanism of different morphologies was discussed.The results indicated that the silica microspheres had an amorphous structure with an average diameter of 1.5 m,and retained the original morphology of the cells.SiO2 nanoparticles could be uniformly coated on the surface of cells to form the hollow SiO2 microspheres,which had uniform wall thickness and could maintain the original morphology of cells.It was confirmed that the formation mechanisms of SiO2 hollow spheres and SiO2 microparticles were based on the difference between adsorption and penetration.