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
Competition between local disordering and global ordering fields in nematic liquid crystals
TL;DR: The influence of external electric or magnetic field B on orientational ordering of nematic liquid crystals or of other rod-like objects in the presence of random anisotropy field type of disorder is studied at zero temperature.
Journal ArticleDOI
Random disorder and the smectic-nematic transition in liquid-crystalline elastomers.
TL;DR: The temperature dependence of the correlation lengths and thermoelastic behavior suggest a shift to a "parasmectic" regime of a first-order smectic-isotropic transition.
Journal ArticleDOI
Phase Transitions of N-(4-methoxybenzylidene)-4-butylaniline (MBBA) Confined within Mesoporous Silica
Takehisa Yoshimi,Ayumi Shima,Shoko Hagiwara-Norifusa,Takayuki Sugimoto,Atsushi Nagoe,Hiroki Fujimori +5 more
TL;DR: In this article, the phase transition of a liquid crystal, N-(4-methoxybenzylidene)-4-butylaniline (MBBA), confined within porous silica materials with one and three-dimensional pore architectures was investigated.
Journal ArticleDOI
Isotropic-to-nematic phase transition of liquid crystals confined in nanoemulsion droplets
TL;DR: In this article, low molecular weight liquid crystals (LMWLCs) were introduced into the core of nano-emulsions, and the phase transition behavior of LMLCs in the core part with the various weight ratios of LMCLs to surfactants.
Journal ArticleDOI
Impact of Nanoparticles on Nematic Ordering in Square Wells
TL;DR: In this paper, the impact of appropriate nanoparticles (NPs) on the tensor order parameter correlation length of a square well was investigated using both Lebwohl-Lasher lattice and the Landau-de Gennes approach.
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
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.
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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.