大尺寸SiO_2胶体颗粒的重力沉降自组装研究  

Self-assembly under gravity sedimentation of large size silica particles

作　　者：周倩[1] 董鹏[1] 程丙英[2] 

机构地区：[1]石油大学重质油国家重点实验室,北京102249 [2]中国科学院物理研究所光物理开放实验室,北京100080

出　　处：《物理学报》2004年第11期3984-3989,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展规划项目 (批准号 :2 0 0 1CB610 4);国家自然科学基金 (批准号 :2 0 0 760 2 7)资助的课题~~

摘　　要：采用两步法合成了直径分别为 782 ,977,10 2 7,116 0和 132 4nm的SiO2 胶体颗粒 ,透射电子显微镜显示颗粒尺寸的平均标准偏差小于 5 % .具有较好的单分散性 .通过调节SiO2 胶体颗粒悬浮液中介质粘度的方法 ,拓宽了重力沉降自组装的尺寸范围 ,得到了颗粒直径为 70 0— 130 0nm的合成蛋白石 ,扫描电子显微镜图像显示它们为面心立方结构 。Highly monodispersed colloidal silica particles in sizes ranging from 700 to 1300 nm were synthesized by a two-step method. The transmission electron microscope images showed that the mean standard deviation of these particles is less than 5%. Silica particle size range for self-assembly in the gravitational sedimentation was broadened through adjusting the viscosity of media in silica suspensions. The synthetic opals with particle diameters ranging from 700 to 1300 nm were obtained,and their optical characteristics were examined. Scanning electron microscope images showed that the synthetic opals have a face-centered-cubic structure and have partial photonic band-gaps. This provides the foundation for the study of complete photonic crystals with wavelengths within near-infrared and infrared regions and for the fabrication of other macroporous materials.

关 键 词：胶体颗粒 自组装 SiO2 透射谱 光子带隙 大尺寸 平均 合成 单分散性 两步法 

分 类 号：TB383[一般工业技术—材料科学与工程]