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Re-investigation of translational–orientational coupling behavior of nematogen in isotropic phase with non-nematogenic additives

We investigated the effects of additives on the translational–orientational coupling constant R using polarized (VV) and depolarized (VH) heterodyne dynamic light scattering, and frequency-dependent shear viscosity measurements of nematogen with two additives mixtures, in order to resolve the inconsistency between previous works using the heterodyne dynamic light scattering and high-frequency strain-optical coefficient measurements. R did not show a significant decrease owing to additives in the concentration range investigated in this work. The significant decrease in R in mixtures reported in previous works is ascribed to the insufficiency of light scattering equipment in the low frequency range.