A Nematic to Nematic Transformation Exhibited by a Rod-Like Liquid Crystal

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A novel, highly polar rod-like liquid crystal was found to exhibit two distinct nematic mesophases (N and Nx). When studied by microscopy and X-ray scattering experiments, and under applied electric fields, the nematic phases are practically identical. However, calorimetry experiments refute the possibility of an intervening smectic mesophase, and the transformation between the nematic phases was associated with a weak thermal event. Analysis of measured dielectric data, along with molecular properties obtained from DFT calculations, applying the Maier-Meier relationship allowed for the degree of antiparallel pairing of dipoles in both nematic phases to be quantified. Based on the results, we conclude that the onset of the lower temperature phase is driven by the formation of antiparallel molecular associations.
Original languageEnglish
Article number11429
Pages (from-to)11429-11435
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number18
Early online date12 Apr 2017
Publication statusPublished - 14 May 2017

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