PA15 ^<13>C-NMRとX線回折によるキラルスメクティック液晶の分子運動と分子配列構造の研究(物理・物性)

概要

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We have investigated molecular dynamics and ^<13>C-NMR spin-lattice relaxation time T_1 measurement and layer structure of the SmA, SmC^* and SmC_A^* phases by means of small angle X-ray observation. Since T_1 minimum occurs in the SmC_A^* phases, the correlation time τ_c of molecular motion should be of the order of 2π/ω_0〜10^<-8> s here, with the Larmor frequency ω_0 of 100 MHz in the present measurement. In addition, the temperature dependence of T_1 also reveals that the correlation time τ_c of molecular motion is to be higher than the Larmor frequency ω_0 in the SmA and SmC^* phases. In addition, we have confirmed the x-ray diffraction peak due to a bi-layer period in the SmC_A^* phase, while it is hardly observed in the SmA and SmC^* phases.
日本液晶学会の論文
2003-10-14