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利用Kossel衍射技术和反射光谱对由总体积分数为0.02的二元聚苯乙烯胶体体系(94 nm+141 nm)形成的胶体晶体的性质进行了研究,实验结果显示胶体晶体的形成时间,平均粒子间距,晶体结构都与二元胶体体系中两种粒子的数密度比相关,当94 nm聚苯乙烯粒子相对于141 nm聚苯乙烯粒子的数密度比趋向1∶1时,胶体晶体的形成时间延长,当94 nm聚苯乙烯粒子相对于141 nm聚苯乙烯粒子的数密度比由1∶0向0∶1变化时,胶体晶体的平均粒子间距变大,另外实验中发现在两种粒子的数密度比为5∶1时,胶体晶体出现了超晶格结构.
Kossel diffraction and reflectance spectroscopy were used to study the properties of colloidal crystals formed by a binary polystyrene colloid system (94 nm + 141 nm) with a total volume fraction of 0.02. The experimental results show that the formation time of colloidal crystals, the average particle size Pitch and crystal structure are related to the number density ratio of two kinds of particles in binary colloidal system. When the number density ratio of 94 nm polystyrene particles to 141 nm polystyrene particles tends to 1: 1, the formation time of colloidal crystals When the number density ratio of 94 nm polystyrene particles to 141 nm polystyrene particles changes from 1: 0 to 0: 1, the average particle spacing of the colloidal crystals becomes larger. In addition, it is found that in the experiments of two kinds of particles When the density ratio is 5: 1, the superlattice structure appears in the colloidal crystals.