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
More filters
Journal ArticleDOI
Memory-controlled smectic wetting of liquid crystals confined to controlled-pore matrices
TL;DR: In this article, the impact of severe spatial confinement on the phase transition behavior of smectic liquid crystals has been systematically studied by means of high-resolution ac calorimetry, and the results show that the carbon tails length of the liquid crystal molecules strongly influences the phase behavior.
Journal ArticleDOI
Hysteresis of Field-Induced Ferroelectric Transition in Pb(Mg1/3Nb2/3)O3 Relaxor Ferroelectrics
Nikola Novak,Z. Kutnjak +1 more
TL;DR: In this paper, the electric field induced ferroelectric transition was studied by polarization and quasi-isothermal measurements in relaxor Pb(Mg1/3Nb2/3)O3 (PMN) single crystal oriented in [110] direction.
Journal ArticleDOI
Calorimetric and dielectric study of vinylidene fluoride–trifluoroethylene-based composite
TL;DR: In this article, the paraelectric to ferroelectric phase transition in 9.5/65/35 lead lanthanum zirconate titanate-poly(vinylidene fluoride-trifluoro ethylene) ceramics-copolymer composite denoted as PLZT 0.76 has been studied by means of calorimetry and dielectric spectroscopy.
Journal ArticleDOI
High-resolution calorimetric investigation of the existence of a nematic phase for the dodecylcyanobiphenyl liquid crystal
TL;DR: In this article, the authors employed high-resolution calorimetric techniques in order to investigate the unresolved issue of the existence of a nematic phase for the liquid crystal dodecylcyanobiphenyl.
Journal ArticleDOI
The influence of multi-walled carbon nanotube doping on liquid crystalline phase transitions of a smectogen octylcyanobiphenyl: A high-resolution birefringence study
TL;DR: In this article, high-resolution optical birefringence measurements are reported on the weakly first order nematicisotropic (N-I) and the continuous nematic-smectic A (N -Sm A) phase transitions in smectic liquid crystal 8CB (octylcyanobiphenyl) doped with both pristine multi-walled carbon nanotubes (p-MWCNTs) and carboxyl group functionalized MWCNTs (f-MW CNTs).
References
More filters
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
TL;DR: The superconducting phase transition is predicted to be weakly first order, because of effects of the intrinsic fluctuating magnetic field, according to a Wilson-Fisher $\ensuremath{\epsilon}$expansion analysis, as well as a generalized mean-field calculation appropriate to a type-I superconductor.
Reference BookDOI
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.