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Abstract : A recent Raman investigation technique 1,2 has been used to study the evolution, with respect to temperature, of two depolarization ratios and deduce the behaviour of the order parameters < P2 > and < P4 > in the nematic liquid crystal p-heptyl- p-nitrile-biphenyl without recourse to a non-nematic probe. Results show that while < P2 > values can be accounted for within the frame of existing mean-field theories, < P4 > values are somewhat lower than what could be predicted by these theories.

Keywords : liquid crystals molecular orientation organic compounds Raman spectra of organic substances depolarization ratios order parameters oriented nematic mesophase temperature dependence Raman scattering p heptyl p- nitrile biphenyl





Author: J.-P. Heger

Source: https://hal.archives-ouvertes.fr/



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