Structural kinetics of silica/water/surfactant meso-phase withtetrahedrally close-packed structure

具有四面体密堆积（TCP）结构的介孔二氧化硅显示出丰富的结构多样性。我们用电子显微镜研究了它们的结构变化。结果如下：（i）在阴离子表面活性剂体系中，我们发现并表征了Pm-3 n（A15），Cmmm（H），P4_2/mnm（σ）和P6/mmm结构。（ii）我们发现并表征了具有十二角对称性的介孔二氧化硅准晶，它们在介观尺度上呈现正方形和等边三角形的二维非周期镶嵌。

Mesoporous silicas with tetrahedrally close-packed (TCP) structures display rich structural diversity. We have investigated their structural changes by electron microscopy. The results were as follows; (i) in anionic surfactant system, we have found and characterized Pm-3n (A15), Cmmm (H), P4_2/mnm (σ) and P6/mmmstructures, (ii) we have found and characterized mesoporous silica quasicrystals with dodecagonal symmetry, which show two dimensional aperiodic tilings of squares and equilateral triangles on the mesoscale.