胶体晶体中的两种排列方式及堆积模式

A monodispersed latex from styrene(St), methyl methacrylate(MMA) and acrylic acid(AA) was synthesized with the soap free emulsion polymerization, and the formation of colloidal crystal by evaporating the water of the latex was investigated. It has been confirmed that there exist two array manners, i.e., hexagonal and square array, and two packing modes, i.e., hexagonal packing and face-centered cubic packing in the forming process of colloidal crystals. The square array originated from the dislocation of the particle in the hexagonal array, the area of it depends on the temperature in the forming process. At a lower temperature such as at 0 ℃, relatively large areas of square array were observed in the formed colloidal crystal.

晶胞教学的几何思路

文中指出了学生在学习晶胞的时候,总是习惯于用数的方法去学习。更符合学习规律的方法应该是:首先将堆积(特别是面心立方最密堆积)理解清楚,然后将不同微粒的堆积在空间上叠加,形成更为复杂的晶胞。并用课本中的例子详细讲述了这个方法。