沉降介质对单分散SiO2微球重力组装欧泊模板的影响  

Effect of sedimentation mediums on opal template fabrication from monodispersed silica under gravitational field

作　　者：段涛[1] 彭同江[1] 唐永建[2] 陈吉明[1] 

机构地区：[1]西南科技大学矿物材料及应用研究所,四川绵阳621010 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2008年第5期784-788,共5页High Power Laser and Particle Beams

基　　金：四川省教育厅青年基金(2006B050);四川省科技厅应用基础项目(2007J13-21);西南科技大学“十一五”重点科技项目(06ZX2107);西南科技大学青年基金资助课题(06ZX3178)

摘　　要：以氨水作催化剂、正硅酸乙酯为硅源、乙醇为溶剂,采用改进溶胶-凝胶法制备了系列单分散SiO2微球,研究了平均粒径为250,280,320 nm单分散SiO2微球在水、无水乙醇、丙酮等介质中的沉降与自组装过程。还对单分散体系重力沉降组装欧泊模板的形成机理进行了讨论。SEM表明,微球在无水乙醇和丙酮沉降介质中均能组装形成3维有序密堆积结构的欧泊,但在无水乙醇中要优于在丙酮中。沉降速度实验表明,相同粒径的单分散SiO2微球在水、乙醇、丙酮作为沉降介质中的沉降速度相差并不大,沉降介质对重力水平沉降组装模板的影响主要是由于其表面张力与粘度不同造成的。The monodispersed silicon dioxide spherical particles were synthesized by improved Sol-gel methods, tetraethoxysilane as silicon material, ammonia as catalyst and ethanol as solvent. The sedimentation and organization of silica spheres with mean diameter of about 250nm, 280nm and 320nm in different mediums of distilled water, ethanol, acetone and water-ethanol mixture were investigated. Images by SEM show the gravity sedimentation of monodispersed silica particles in ethanol or acetone can form three-dimension closed packing structural opal, and ethanol is superior to acetone in opal fabrication. Silica spheres sedimentation experiment indicated that the velocity of isometric silica microspheres sedimentation in water, ethanol and acetone has little difference. The influence of sedimentation mediums on opal templates results from their surface tension and viscosity. The formation mechanism of opal by gravitational field sedimentation was also discussed.

关 键 词：欧泊 二氧化硅微球 单分散 沉降介质 自组装 

分 类 号：TN204[电子电信—物理电子学]