Journal ArticleDOI
Calorimetric study of octylcyanobiphenyl liquid crystal confined to a controlled-pore glass.
TLDR
The heat-capacity response at the weakly first order I-N and continuous N-SmA phase transitions gradually approaches the tricritical-like and three-dimensional XY behavior, respectively.Abstract:
We present a calorimetric study of the phase behavior of octylcyanobiphenyl (8CB) liquid crystal confined to a controlled-pore glass (CPG). We used CPG matrices with characteristic void diameters ranging from 400 to 20 nm. In bulk we obtain weakly first-order isotropic to nematic (I-N) phase transition and nearly continuous character of the nematic to smectic-A (N-SmA) phase transition. In all CPG matrices the I-N transition remains weakly first order, while the N-SmA one becomes progressively suppressed with decreasing CPG pore radius. With decreased pore diameters both phase transition temperatures monotonously decrease following similar trends, but increasing the stability range of the N phase. The heat-capacity response at the weakly first order I-N and continuous N-SmA phase transitions gradually approaches the tricritical-like and three-dimensional XY behavior, respectively. The main observed features were explained using a bicomponent single pore type phenomenological model.read more
Citations
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Journal ArticleDOI
Phase behaviour of n-CB liquid crystals confined to controlled pore glasses
TL;DR: In this article, the phase behavior of liquid crystals (LCs) confined to Controlled-Pore Glasses (CPG) of various pore sizes is investigated. And the authors show that the phase transition shifts display inversely linear and inversely quadratic contributions in terms of pore size.
Book ChapterDOI
Orientational Order and Paranematic–Nematic Phase Transition in Liquid Single Crystal Elastomers: Nuclear Magnetic Resonance and Calorimetric Studies
Book ChapterDOI
Electrocaloric effect in liquid crystals
TL;DR: In this paper , the electrocaloric effect at the isotropic-nematic (I − N) and direct isotropics smectic A (I-SmA) phase transition is analyzed.
Proceedings ArticleDOI
Molecular Ordering of Nematic Liquid Crystals in Tubular Nanopores: Tailoring of Optical Anisotropy at the Nanoscale by Polymer Pore-surface Grafting
Andriy V. Kityk,Monika Lelonek,Patrick Huber,Kathrin Sentker,Anatoliy Andrushchak,Przemysław Kula,Wiktor Piecek,Robert Wielgosz,Olha Kityk,Petra Goering +9 more
TL;DR: In this paper, the optical polarimetry technique is used to explore molecular ordering of nematic liquid crystals embedded in parallel cylindrical channels of alumina membranes with pore walls covered by a SE-1211 polymer film enhancing normal anchoring.
Journal ArticleDOI
Thermal Response at the Dipolar-Glass to Ferroelectric Transition in Structuraly Disordered Ferroelectric Materials
TL;DR: In this paper, the authors studied the thermal response near the dipolar glass to ferroelectric (G-F) transition studied by a high resolution calorimetry in relaxor Ferroelectric 9/65/35 PLZT ceramics and confirmed the existence of the first order G-F transition line in the E-T phase diagram of the perovskite relaxor ferroelectrics.
References
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Book
The physics of liquid crystals
P. G. de Gennes,Richard Alben +1 more
TL;DR: In this paper, the authors define an order parameter statistical theories of the nematic order phenomonological description of the nematic-isotopic mixtures and describe the properties of these mixtures.
Journal ArticleDOI
First-Order Phase Transitions in Superconductors and Smectic- A Liquid Crystals
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Liquid crystals in complex geometries : formed by polymer and porous networks
G P Crawford,S Zumer +1 more
TL;DR: In this paper, the authors provide a current treatise of the subject matter and places it in the broader context of electrooptic applications, taking an interdisciplinary approach to the subject, combining basic principles of physics, chemistry, polymer science, materials science and engineering.
Journal ArticleDOI
Temperature dependence of the enthalpy and the heat capacity of the liquid-crystal octylcyanobiphenyl (8CB)
TL;DR: In this paper, an adiabatic scanning calorimeter has been used to study the thermal behavior of the liquid-crystal octylcyanobiphenyl (8CB) in the temperature range between 10 and 50°C.
Journal ArticleDOI
Universality and Scaling in the Disordering of a Smectic Liquid Crystal
TL;DR: Experimental and theoretical studies of the effects of quenched disorder on one-dimensional crystal ordering in three dimensions show extended short-range correlations that exhibit universal structure and scaling, anomalous layer elasticity, and glassy dynamics.