Science. 1993 Apr 16;260(5106):323-6. doi: 10.1126/science.260.5106.323.
Monolayer Langmuir-Blodgett films of a discotic mesogen have been studied with atomic force microscopy (AFM). These measurements confirm the "edge on" arrangement for the disk-shaped molecules suggested by surface pressure-area isotherms and show that the molecules form columns that are separated by 17.7 angstroms +/- 10 percent. Column alignment is found to be predominantly along the film deposition direction, with an angular spread of 35 degrees . The AFM images also show that the mean disk separation within the columns is 5.1 +/- 1.3 angstroms, in good agreement with x-ray diffraction (XRD) results. Roomtemperature XRD measurements on bulk samples of the same material indicate a disordered-hexagonal liquid crystalline mesophase, with a column-to-column spacing of 19.9 +/- 0.2 angstroms.
已使用原子力显微镜（AFM）对盘状介晶的单层 Langmuir-Blodgett 膜进行了研究。这些测量结果证实了表面压-面积等温线所建议的盘状分子的“边缘朝下”排列，并表明分子形成了由 17.7 埃 ± 10%分隔的柱体。发现柱体的对齐主要沿膜沉积方向，具有 35 度的角散布。AFM 图像还表明，柱体内的平均盘间距为 5.1 ± 1.3 埃，与 X 射线衍射（XRD）结果吻合良好。相同材料的块状样品的室温 XRD 测量表明，存在无序六方液晶中间相，柱与柱之间的间距为 19.9 ± 0.2 埃。
