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
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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。Abstract: 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 sedimentat
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Key words:
- opal /
- silica microsphere /
- monodispersity /
- sedimentation medium /
- self-assembly
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