The Instability of Planar Texture in Cholesteric and Nematic Mixture with the Negative Dielectric Anisotropy

概要

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The induced patterns under ac. electric field are examined in the dilute choles-teric and nematic mixtures with the negative dielectric anisotropy. The instabilityin the planar texture is triggered by a material flow at threshold voltage andregular periodic patterns can be observed by using the polarizing microscope.The patterns are deformed due to the formation of axial disclinations withincreasing the field. The deformation is stabilized by making the new planartexture under the applied field. The number of twists increases in the new planartexture. When we increase the field further, the instability occurs in the newplanar texture. A new mechanism for succeeding transitions is proposed. Boththe electrohydrodynamic instability and the contraction of the cholesteric pitchare important in the mechanism.
社団法人日本物理学会の論文
1978-05-15