Rupture and regeneration of colloidal crystals as studied by two-dimensional ultra-small-angle X-ray scattering |
| |
Authors: | Konishi Toshiki Ise Norio |
| |
Affiliation: | Central Laboratory, Rengo Company, Ltd., 186-1 4-chome, Ohhiraki, Fukushima, Osaka 553-0007, Japan. |
| |
Abstract: | The structure of colloidal crystals of silica particles in water was studied by using the two-dimensional (2D) ultra-small-angle X-ray scattering (USAXS) technique. By violent shaking of the dispersion, large (body-centered cubic, bcc) crystals were broken into microcrystals while the lattice structure and lattice constant were preserved. The 2D-USAXS profiles revealed that the [111] direction of bcc microcrystals was parallel to the capillary axis and their orientational distribution with respect to the capillary axis was random. While a prepeak was observed in the one-dimensional USAXS measurements, no such peak was detected by the 2D-USAXS technique. The prepeak was concluded to be due to {110} being rotated by 54.7 degrees (the angle between [001] and [111]) from the capillary axis. The diffraction from the plane was out of the horizontal plane and was observed at a lower angle as a prepeak by detector scanning in the horizontal direction. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|