title: Nematic-nematic phase transition in the liquid crystal dimer CBC9CB and its mixtures with 5CB: a high-resolution adiabatic scanning calorimetric study.
abstract: 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.
authors.affiliation: Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
authors.forename: Chandra Shekhar Pati
authors.initials: CS
authors.lastname: Tripathi
authors.forename: Patricia
authors.initials: P
authors.lastname: Losada-Pérez
authors.forename: Christ
authors.initials: C
authors.lastname: Glorieux
authors.forename: Alexandra
authors.initials: A
authors.lastname: Kohlmeier
authors.forename: Maria-Gabriela
authors.initials: MG
authors.lastname: Tamba
authors.forename: Georg H
authors.initials: GH
authors.lastname: Mehl
authors.forename: Jan
authors.initials: J
authors.lastname: Leys