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The dynamic scattering (DS) characteristics and the conductivity anisotropy ratio (Rσ = σ∥/σ1) are shown to depend upon the structure and concentration of conductivity dopants as well as upon the structure of two nematic liquid crystals. For both a phenyl benzoate liquid crystal and for MBBA the ac threshold voltage (V th) decreases with increasing Rσ, and the optical density of scattering at 30 V rms is directly proportional to Rσ. In each liquid crystal there is a linear relationship between V −2 th and R −1σ, in agreement with the Carr-Helfrich theory.
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Margerum et al. (1977) studied this question.
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