ENEA, C. R. Casaccia, Via Anguillarese 301, I-00060 S. Maria di Galeria (Roma), Italy.
Beilstein J Org Chem. 2010 May 20;6:51. doi: 10.3762/bjoc.6.51.
Thin films of the discotic liquid crystal hexapentyloxytriphenylene (HAT5), prepared from solution via casting or spin-coating, were investigated by atomic force microscopy and polarizing optical microscopy, revealing large-scale ordered structures substantially different from those typically observed in standard samples of the same material. Thin and very long fibrils of planar-aligned liquid crystal were found, possibly formed as a result of an intermediate lyotropic nematic state arising during the solvent evaporation process. Moreover, in sufficiently thin films the crystallization seems to be suppressed, extending the uniform order of the liquid crystal phase down to room temperature. This should be compared to the bulk situation, where the same material crystallizes into a polymorphic structure at 68 °C.
采用溶液浇铸或旋涂的方法制备了盘状液晶六戊氧基三苯（HAT5）的薄膜，并通过原子力显微镜和偏光显微镜对其进行了研究，结果表明其具有与标准样品中典型的大尺度有序结构显著不同的结构。发现了薄而非常长的平面排列液晶纤维，可能是在溶剂蒸发过程中形成的中间溶致向列态的结果。此外，在足够薄的薄膜中，结晶似乎被抑制，使液晶相的均匀有序延伸到室温。这与在 68°C 下结晶成多晶结构的相同材料的体相情况形成了对比。
