摘要
无皂乳液聚合法制备了不同尺寸单分散的PS微球,采用离心法和垂直沉降法将之组装成具有光子带隙的人工欧泊.采用扫描电子显微镜(SEM)和可见-紫外光度计对PS胶体晶体的形貌、结构和光学性能进行了观察测试.结果表明厚度较大的PS胶体晶体可以通过离心法组装制得,当转速为1 000 r/min、干燥温度为40℃时可以组装得到高质量的PS胶体晶体,而垂直沉降法则较适合组装薄型的胶体晶体.从样品的光学特性讨论了适合组装的乳液固含量,改变组装胶体晶体的PS微球粒径可以得到不同的光带隙波长.
Monodisperse polystyrene （PS） colloidal particles were prepared by a quick emulsifier-free emulsion polymerization （EFEP） method, and their highly ordered colloidal crystals were fabricated by both centrifugal method and vertical surface method. Scanning Electron Microscope （SEM） and VIS-UV were used to study the topography, structure and optical properties of the colloidal crystals. The resulting planar samples by centrifugal method were distinctly thicker than that by vertical surface method. PS colloidal crystals by centrifugal method with a velocity of 1 000 r/min and a temperature of 40 ℃ exhibited a highly ordered three dimensional structure. The optimized assembly conditions were discussed via samples＇ optical properties and the transmission spectra showed the peak wavelength suffered a shift with the change of the PS spheres＇ diameter.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期126-133,共8页
Journal of East China Normal University(Natural Science)
关键词
PS微球
胶体晶体
离心法
垂直沉降
polystyrene microsphere
colloidal crystal
centrifugal method
vertical surface method
