Lyotropic hexagonal columnar liquid crystals of large colloidal gibbsite platelets.
Lyotropic hexagonal columnar liquid crystals of large colloidal gibbsite platelets.
复制标题
大胶体三水铝石片晶的溶致六方柱状液晶。
作者：
M. Mourad;A. Petukhov;G. Vroege;H. Lekkerkerker
我们报告的六角柱状液晶相的形成在大（570 nm直径），空间稳定，胶体三水铝石血小板在有机溶剂中的悬浮液。在薄的细胞中，这些系统显示出强烈的彩虹色，源于主要垂直于细胞壁排列的六边形排列的柱。小角X射线散射和偏振显微镜表明存在的六方柱液晶相的取向波动。的平均血小板取向和列轴以及列波动导致的有效柱直径的减少去耦的存在进行了讨论。事实上，这些现象在垂直方向上特别明显，并朝着系统的底部部分增强，这表明重力压实对结构的作用。
We report the formation of hexagonal columnar liquid crystal phases in suspensions of large (570 nm diameter), sterically stabilized, colloidal gibbsite platelets in organic solvent. In thin cells these systems display strong iridescence originating from hexagonally arranged columns that are predominantly aligned perpendicularly to the cell walls. Small angle X-ray scattering and polarization microscopy indicate the presence of orientational fluctuations in the hexagonal columnar liquid crystal phase. The presence of decoupling of the average platelet orientation and the column axis as well as column undulations leading to a decrease of the effective column diameter are discussed. The fact that these phenomena are particularly pronounced in the vertical direction and are enhanced toward the bottom part of the system points to the role of gravitational compaction on the structure.