3-dim, growth of well ordered cubic silsesquioxane powders from 0-dim. nanosized particles

초록

The growth mechanism of silsesquioxane powders from nano-sized spherical organosilica particles was elucidated using SEM and TEM spectroscopy. The well ordered cubic silsesquioxane powder could be prepared by the controlled growth, while typical spherical powders were obtained by the normal sol-gel process. The growth process consisted of assembly steps: 1) the formation of 1 dim. rod with necklace shape by anisotropic assembly of nano-sized particles, 2) the fusion of 1 dim. rods to bundles, and 3) the formation of cubic powder by assembly of the bundles. The cubic silsesquioxane powders were highly crystalline and only contained T8R oligomeric cubane structures as a building units as can be seen in IR, Raman, and XRD analysis. They also exhibited same thermal properties as those of T8X crystals.