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Nematic-nematic phase transition in the liquid crystal dimer CBC9CB and its mixtures with 5CB: A high-resolution adiabatic scanning calorimetric study

par Pati Tripathi, Chandrashekhar;Losada Perez, Patricia ;Glorieux, Christ;Kohlmeier, Alexandra;Tamba, MG;Mehl, George H;Leys, Jan
Référence Physical review. E, Statistical, nonlinear, and soft matter physics, 84, page (041707)
Publication Publié, 2011-10-28

Article révisé par les pairs

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Résumé :

The phase transition behavior of the liquid crystal dimer α,ω-bis(4,4′-cyanobiphenyl)nonane (CBC9CB), which has been reported to exhibit a nematic-nematic phase transition, has been investigated by means of high-resolution adiabatic scanning calorimetry. This nematic-nematic phase transition is weakly first-order with a latent heat of 0.24±0.01 kJ kg−1. Mixtures up to 40 wt % with 4-pentyl-4′-cyanobiphenyl (5CB) liquid crystals have also been investigated, which also show this nematic to nematic phase transition. The transition stays weakly first-order with a decreasing latent heat with increasing concentration of 5CB. For mixtures with more than 40 wt % uniaxial nematic-unknown nematic phase transition was not observed.