Journal ArticleDOI
Calorimetric study of octylcyanobiphenyl liquid crystal confined to a controlled-pore glass.
Reads0
Chats0
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
Ultrasonic studies of structural transformations and phase transitions in liquid crystal emulsions
TL;DR: In this paper, the propagation velocity and absorption coefficient of ultrasound in the range of 0.6-150 MHz in a series of liquid crystal emulsions prepared on the basis of thermotropic liquid crystals and isotropic liquids were studied.
Journal ArticleDOI
Road to disorder in smectic elastomers.
TL;DR: High-resolution x-ray study of the effects of disorder induced by random cross-linking side-chain smectic elastomers indicates strong nonuniform strain within finite-size domains and local deformations induced by randomly distributed dislocations.
Journal ArticleDOI
Evolution of the isotropic to nematic phase transition in binary mixtures of octylcyanobiphenyl and n-hexane
TL;DR: It is shown that solvent dilution of a LC, if miscible and depending on solvent structure, can lead to a controlled altering of the intermolecular potentials and softening of the LC viscoelastic properties.
Journal ArticleDOI
Soft versus hard confinement effects on the phase transitions, and intra- and inter- molecular dynamics of 6BT liquid crystal constrained in electrospun polymer fibers and in nanopores
Małgorzata Jasiurkowska-Delaporte,Ewa Juszyńska-Gałązka,Wojciech Sas,Piotr Zieliński,Anna Baranowska-Korczyc +4 more
TL;DR: In this paper, the behavior of a liquid crystal (LC) under soft confinement, resulting from interactions between polymer and guest liquid crystalline molecules, and under hard confinement, imposed by rigid pore walls was examined.
Journal ArticleDOI
Direct measurements of the electrocaloric effect in P(VDF-TrFE) (68/32) copolymer ferroelectric films
TL;DR: In this article, a method and analysis of direct measurements of the electrocaloric effect in P(VDF-TrFE) (68/32 mol%) copolymer thin films are presented.
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.