二元体系胶体晶体性质的实验研究

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(94nm+141nm)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94nm聚苯乙烯粒子相对于141nm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94nm聚苯乙烯粒子相对于141nm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 关键词： 胶体晶体 聚苯乙烯 Kossel衍射 反射光谱

An experimental study on colloidal crystals formed in two-component dispersion of charged particles

Characterization of colloidal crystals composed of two types of polystyrene particles of different sizes (94 nm and 141 nm respectively) at different number ratios is studied by means of Kossel diffraction and reflection spectra technique. The results showed the dependence of the mean interparticle distance (D₀) and crystal structure on the number ratio of the two types of particles. The formation time of crystals lengthens as the number ratio of the two components approaches 1∶1. When the number ratio (9 4nm∶141 nm) decreases, the mean interparticle distance (D₀) becomes larger. This study also shows that when the above number ratio equals 5:1, superlattice structure appears in the binary colloidal system.