Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
J Chem Phys. 2013 Sep 21;139(11):114902. doi: 10.1063/1.4821162.
Based on new diffraction data from aligned samples of smectic E (SmE) phase of 4-n-alkyl-4'-isothiocyanato-1,1'-biphenyls, systematics against the alkyl chain length n is analyzed. In order to perform the analysis, the molecular form factor approximated by a box-shaped distribution is calculated while taking the rounding of the distribution at corners into account. The analysis clearly shows the nano-segregated layered structure, which does not fit to the traditional structural view of SmE phase but does fit to the model the present authors proposed recently. Some implications of this conclusion are discussed in relation to the importance of the molten state of alkyl chains in most of real mesogens revealed previously through thermodynamic analyses.
基于对齐的近晶 E 相（SmE）的 4-正烷基-4′-异硫氰酸酯-1,1′-联苯的新衍射数据，对烷基链长 n 进行了系统分析。为了进行分析，计算了近似为盒状分布的分子形态因子，同时考虑了分布在拐角处的圆化。分析清楚地表明了纳米分离的层状结构，这与 SmE 相的传统结构观点不相符，但与本作者最近提出的模型相符。通过热力学分析揭示了大多数实际介晶中烷基链的熔融状态的重要性，这一结论在讨论中得到了体现。
