2AE08 液晶秩序の揺らぎとラテックス粒子のブラウン運動間の動的結合と液晶相転移

概要

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We have studied the dynamical coupling between the undulation fluctuation of the membrane and the Brownian motion of the latex particles in the latex doped lyotropic smectic liquid crystal. The order parameter decreases by increase in the latex concentration in the smectic liquid crystal, because the thermally excited isotropic Brownian motion of the latex particles does not prefer the ordered wall of layered structure. On the other hand, applying the electric field, due to the suppression of the undulation fluctuation stabilizes the lamellar structure by the anisotropic motion of the latex particles driving by the electric field. We also systematically investigated by DSC that this dynamical coupling affects to the thermodynamic L_α-L_3 phase transtion. By increase in the latex concentration, tne transition temperature increases, and width of the coexistence region become narrow range. This is because the latex particles can fluctuate more freely in the L_α phase. This entropy difference leads the phase transition.
日本液晶学会の論文
1997-09-24