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Title

Effect of Molecular Flexibility on the Nematic-to-Isotropic Phase Transition for Highly Biaxial Molecular Non-Symmetric Liquid Crystal Dimers

AuthorsSebastián, Nerea; Fuente, M. Rosario de la; Ros, M. Blanca
Issue Date2011
PublisherMultidisciplinary Digital Publishing Institute
CitationMaterials 4(10): 1632-1647 (2011)
AbstractIn this work, a study of the nematic (N)–isotropic (I) phase transition has been made in a series of odd non-symmetric liquid crystal dimers, the α-(4-cyanobiphenyl-4’-yloxy)-ω-(1-pyrenimine-benzylidene-4’-oxy) alkanes, by means of accurate calorimetric and dielectric measurements. These materials are potential candidates to present the elusive biaxial nematic (NB) phase, as they exhibit both molecular biaxiality and flexibility. According to the theory, the uniaxial nematic (NU)–isotropic (I) phase transition is first-order in nature, whereas the NB–I phase transition is second-order. Thus, a fine analysis of the critical behavior of the N–I phase transition would allow us to determine the presence or not of the biaxial nematic phase and understand how the molecular biaxiality and flexibility of these compounds influences the critical behavior of the N–I phase transition.
URIhttp://hdl.handle.net/10261/52625
DOI10.3390/ma4101632
Identifiersdoi: 10.3390/ma4101632
issn: 1996-1944
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