ESR Study of Molecular Order and Motion in a Nematic Liquid Crystal

概要

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The molecular order and the motion of a spin probe, vanadyl acetylacetonate (VAA), incorporated in a nematic liquid crystal N-(p-methoxybenzylidene)-p-n-butylaniline (MBBA) were explored by the ESR technique. By using the anisotropy of the magnetic parameters, the degree of the order of VAA in various phases was evaluated. An abrupt increase at the solid-liquid crystalline transition and a monotonical decrease at the clearing point were observed. The latter suggests that a short range order still remains in the isotropic phase near the clearing point. In the isotropic phase, the correlation time was evaluated using Kivelson's formalism to be in the range of 10^<-9> to 10^<-10> sec. A higher order was found in the nematic phase upon increasing the magnetic field strength. An analysis for the ordering due to the magnetic field indicates that a small magnitude of order survives even at the zero field limit.
社団法人応用物理学会の論文
1977-08-05