Browsing by Subject "Liquid crystals"
Now showing items 1-20 of 29
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Boson peak in transitionally ordered and orientationally disordered phases
(Universitat Politècnica de Catalunya, 2020-06)
Bachelor thesis
Open Access
Covenantee: University of TsukubaLos vidrios y cristales desordenados han sido objeto de debate debido a su comportamiento anormal en sus propiedades dieléctricas y termodinámicas. En el siguiente trabajo, se ha estudiado un conjunto de dos muestras que ... -
Cascaded Conical Refraction
(Universitat Politècnica de Catalunya / Universitat Autònoma de Barcelona, 2011-07-19)
Master thesis
Open AccessEnglish: After a brief introduction to the conical refraction phenomenon, the formation of transverse intensity patterns by a cascade of biaxial crystals with alignedoptic axes is studied in detail. Up to 2^(N-1) concentric ... -
Characterization of a Parallel Aligned Liquid Crystal on Silicon display and its application on a Shack-Hartmann sensor
(Universitat Politècnica de Catalunya / Universitat Autònoma de Barcelona, 2010-07-15)
Master thesis
Open AccessThe characterization and the optimization of a parallel aligned liquid crystal on silicon display has been conducted with the aim to use it for the generation of a microlenses array in a Shack-Hartmann sensor. The entire ... -
Chondroinductive alginate-based hydrogels having graphene oxide for 3D printed scaffold fabrication
(2020-01-07)
Article
Open AccessScaffolds based on bioconjugated hydrogels are attractive for tissue engineering because they can partly mimic human tissue characteristics. For example, they can further increase their bioactivity with cells. However, ... -
Controllable coherent backscattering of light in disordered media filled with liquid crystal
(2018-05-09)
Article
Open AccessWe have investigated multiple scattering of light in a disordered system based on liquid crystals for a temperature-controllable random laser. Coherent backscattering measurements at several temperatures have been well ... -
Cooperative behavior of molecular motions giving rise to two glass transitions in the same supercooled mesophase of a smectogenic liquid crystal dimer
(American Chemical Society (ACS), 2018-01-17)
Article
Restricted access - publisher's policyIn the present work, a detailed analysis of the glassy behavior and the relaxation dynamics of the liquid crystal dimer a-(4-cyanobiphenyl-4'-yloxy)-¿-(1-pyrenimine-benzylidene-4'-oxy) heptane (CBO7O.Py) throughout both ... -
Cylindrical sub-micrometer confinement results for the odd-symmetric dimer alpha,omega-Bis[(4-cyanobiphenyl)-4 '-yloxy]undecane (BCB.O11)
(American Chemical Society (ACS), 2010-05-05)
Article
Restricted access - publisher's policyBroadband dielectric spectroscopy (102 Hz to 1.9 × 109 Hz) and specific heat measurements have been performed on the odd-symmetric dimer R,ω-bis[(4-cyanobiphenyl)-4′-yloxy]undecane (BCB.O11) in the isotropic (I) and ... -
Desarrollo de herramientas para evaluaciones ópticas y guía de introducción al laboratorio de metrología de paneles
(Universitat Politècnica de Catalunya, 2012-04-24)
Master thesis (pre-Bologna period)
Open Access[ANGLÈS] The target of this project is the development of software tools for optical evaluation of display panels (and/or television devices) in the Display Metrology Lab at Sony R&D facilities in Viladecavalls. The core ... -
Design and testing of a graded-index liquid crystal optical deflector
(Universitat Politècnica de Catalunya, 2009-07-20)
Master thesis
Open AccessOptical deflectors have been used in a wide range of applications, from marking applications to optical links.Some of them are based on micro-electromechanical systems, now a growing market. Another group of deflectors ... -
Design, fabrication and characterization of a liquid crystal-based light deflector
(Universitat Politècnica de Catalunya, 2009-07-09)
Master thesis
Open AccessLiquid crystal (LC) devices are increasingly attracting much interest for applications where an electrical control of light is required. In this work, a nematic LCbased optical deflector has been designed, fabricated and ... -
Development of a new multispectral imaging system consisting of a liquid crystal tunable filter
(Universitat Politècnica de Catalunya, 2013-09-05)
Master thesis
Open Access[ANGLÈS] The aim of this study was to develop a new portable multispectral system basically composed of a monochrome digital camera, a liquid crystal tunable filter (LCTF) and a laptop. The system had a high spatial ... -
Dispersion of gamma-alumina nano-sized spherical particles in a calamitic liquid Crystal. Study and optimization of the confinement effects
(2014-03-01)
Article
Open AccessWe report an experimental study on confined systems formed by butyloxybenzylidene octylaniline liquid crystal (4O.8) + gamma-alumina nanoparticles. The effects of the confinement in the thermal and dielectric properties ... -
Distinctive dielectric properties of nematic liquid crystal dimers
(2017-01-01)
Article
Open AccessWe provide an overview of the effect of the molecular structure on the dielectric properties of dimers exhibiting nematic and twist-bend nematic phases with special focus on how the conformational distribution changes are ... -
Heat diffusion anisotropy in dendritic growth: phase field simulations and experiments in liquid crystals
(1998-10)
Article
Restricted access - publisher's policyAn anisotropic heat diffusion coefficient is introduced in order to study some interfacial growth phenomena. This anisotropy has been incorporated in a phase field model which has been studied numerically to reproduce some ... -
Het diffusion anisotropy in dendritic growth: phase field simulations and experiments in liquid crystals
(Elsevier, 1998-10-15)
Article
Restricted access - publisher's policyAn anisotropic heat diffusion coefficient is introduced in order to study some interfacial growth phenomena. This anisotropy has been incorporated in a phase field model which has been studied numerically to reproduce some ... -
Influence of liquid crystalline phases on the tunability of a random laser
(American Chemical Society (ACS), 2017-05-30)
Article
Restricted access - publisher's policyIn this paper, we report the temperature behavior of an optimized disordered photonic system-based liquid crystal by means of heat capacity and refractive index measurements. The scattering system is formed by a porous ... -
Liquid crystal hyperbolic metamaterial for wide-angle negative-positive refraction and reflection
(2014-04-01)
Article
Open AccessWe show that nanosphere dispersed liquid crystal (NDLC) metamaterial can be characterized in near IR spectral region as an indefinite medium whose real parts of effective ordinary and extraordinary permittivities are ... -
Liquid crystal spatial light modulator with optimized phase modulation ranges to display multiorder diffractive elements
(Multidisciplinary Digital Publishing Institute, 2019-07-01)
Article
Open Access -
Multiorder diffractive lenses with low f-number
(Universidad de Zaragoza (UZA), 2019)
Conference lecture
Restricted access - publisher's policyRecent liquid crystal on silicon (LCoS) spatial light modulators (SLMs) working on reflection can achieve large phase modulation ranges, permiting the implementation of multiorder diffractive lenses. These lenses are ... -
Order parameters and time evolution of mesophases in the lyotropic chromonic liquid crystal Sunset Yellow FCF by DNMR
(2018-09-21)
Article
Open AccessUniaxial order parameters of the nematic and columnar mesophases in the lyotropic chromonic liquid crystal Sunset Yellow FCF have been determined from deuteron nuclear magnetic resonance, where random confinement of the ...
