Journal ArticleDOI
Does the characteristic value of the discontinuity of the isotropic?mesophase transition in n-cyanobiphenyls exist?
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It is suggested that for each nCB a unique, characteristic minimal value of ΔT, associated with the I-N-SmA triple point, exists and can be hidden in the negative pressures domain for 'shorter' nCBs, and the possibility of the extension of the 'melting curve' into thenegative pressures region as well as the appearance of the'melting inversion' at high enough pressures is indicated.Abstract:
Results of the extended Landau?de Gennes model analysis and experimental studies of the isotropic?nematic (I?N) and isotropic?smectic-A (I?SmA) phase transitions in rod-like liquid crystalline n-alkylcyanobiphenyls are presented. Experiments were carried out as a function of temperature and pressure using the static dielectric permittivity and its ?nonlinear? (strong electric field related) counterpart?the low-frequency nonlinear dielectric effect. Precise estimations of the values of the discontinuity of the isotropic?mesophase transitions (?T) for nCB from n?=?3?14 have been obtained. It is suggested that for each nCB a unique, characteristic minimal value of ?T, associated with the I?N?SmA triple point, exists. For ?shorter? nCBs it can be hidden in the negative pressures domain. The possibility of the extension of the ?melting curve? into the negative pressures region as well as the appearance of the ?melting inversion? at high enough pressures is indicated.read more
Citations
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Journal ArticleDOI
Isotropic to smectic-A phase transition: A review
TL;DR: In this article, the authors present an attempt towards a unified picture of the direct transition from the isotropic to smectic-A phase, including structure and nature revealed by experiments, molecular models and Landau-de Gennes theory.
Journal ArticleDOI
Thermotropic, refracting and thermo-optical properties in three homologs of 4-n-alkyl-4'- cyanobiphenyls
TL;DR: In this article, the authors investigated the temperature behavior of the mean refractive index n, ordinary n o and extraordinary n e refractive indices, and birefringence Δn for three homologues of 4-n-alkyl-4-4'-cyanobiphenyls (n = 8, 10, 12) using the isotropic internal field model (Vuks approach).
Journal ArticleDOI
Dielectric permittivity in the isotropic phase above the isotropic to smectic-A phase transition
TL;DR: In this paper, a phenomenological model was used to find theoretically the temperature dependence of the static dielectric permittivity at the isotropic to smectic-A phase transition.
Journal ArticleDOI
Response to “Comment on ‘Nonlinear dielectric response of polar liquids”’ [J. Chem. Phys. 144, 087101 (2016)]
TL;DR: The problem raised in the Comment is to how correctly calculate the Piekara coefficient linking the fieldinduced alteration of the material dielectric constant to squared Maxwell electric field E, ∆ǵE = ǫE−ǫs = −aE ; ǬE is the field-dependent dielectrics constant and ǵs is its E = 0 value.
Reference EntryDOI
High‐Pressure Investigations of Liquid Crystals
TL;DR: In this article, the phase transition is separated into transition entropy separation and phase transition transition transition potential, and then phase transition phase transition entropy separator is used to determine the order parameter.
References
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