Browsing by Author "López Pérez, David Orencio"
Now showing items 1-20 of 35
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Anopore confinement in the cyanobiphenyl-based liquid crystal dimer CB7CB. A dielectric study
(2024-08-01)
Article
Open AccessWe report an experimental work on the liquid crystal dimer 1’’,7’-bis(4-cyanobiphenyl-4’-yl) heptane (CB7CB) confined to Anopore membranes. We have studied the behaviour of the dielectric relaxation modes in the isotropic ... -
Bent-rod liquid crystal dimers: synthesis and mesomorphic properties
(Royal Society of Chemistry, 2014-01-01)
Article
Restricted access - publisher's policyThe synthesis and characterization of three bent-rod dimers are reported. Very long flexible spacers that include methylene units and either a phenyl ring or a triazole moiety as connecting structures join the bent-and ... -
Comparative dielectric and thermally stimulated-depolarization-current studies of the liquid crystal dimers 1¿,9¿-bis(4-cyanobiphenyl-4'-yl) nonane and heptane and a binary mixture between them, close to the glass transition
(American Institute of Physics (AIP), 2022-11-21)
Article
Open AccessWe have performed dielectric spectroscopy and thermally stimulated-depolarization-current experiments to study the molecular dynamics of the twist-bend nematic phase close to the glass transition of two members of the ... -
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 ... -
Dielectric, calorimetric and mesophase properties of 1 ''-(2 ',4-difluorobiphenyl-4 '-yloxy)-9 ''-(4-cyano-biphenyl-4 '-yloxy) nonane: an odd liquid crystal dimer with a monotropic mesophase having the characteristics of a twist-bend nematic phase
(2014-10-21)
Article
Restricted access - publisher's policyThis paper reports a novel liquid crystal phase having the characteristics of a twist-bend nematic phase formed by a non-symmetric ether-linked liquid crystal dimer. The dimer 1 ''-(2',4-difluorobiphenyl-4'-yloxy)-9 ... -
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 ... -
Distortion-sensitive insight into the pretransitional behavior of 4-n-octyloxy-4 '-cyanobiphenyl (8OCB)
(Institute Of Physics Publishing Ltd, 2013-06)
Article
Restricted access - publisher's policyResults of studies of the static and dynamic dielectric properties in rod-like 4-n-octyloxy-40-cyanobiphenyl (8OCB) with isotropic (I)–nematic (N)–smectic A (SmA)–crystal (Cr) mesomorphism, combined with measurements of ... -
DNMR measurements of an asymmetric odd liquid crystal dimer: determination of the intramolecular angle and the degree of order of the two rigid cores
(Royal Society of Chemistry (RSC), 2023)
Article
Open AccessIn this work, we present a Deuteron Nuclear Magnetic Resonance (DNMR) study of the non-symmetric odd liquid crystal dimer a-(4-cyanobiphenyl-4'-yloxy)-¿-(1-pyrenimine-benzylidene-4'-oxy) heptane (CBO7O.Py), formed by a ... -
Double glass transition in polyethylene naphthalate by MDSC, BDS, and TSDC
(American Institute of Physics (AIP), 2024-08-07)
Article
Open AccessIn this work, we present an experimental study of the primary and secondary relaxations of the semi-crystalline polymer polyethylene naphthalate by modulated differential scanning calorimetry, Thermally Stimulated ... -
FÍSICA FONAMENTAL II (Examen final 1r quadrimestre)
(Universitat Politècnica de Catalunya, 2024-01-24)
Exam
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FÍSICA FONAMENTAL II (Examen parcial 1r quadrimestre)
(Universitat Politècnica de Catalunya, 2024-10-05)
Exam
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FÍSICA II (Examen final 1r quadrimestre)
(Universitat Politècnica de Catalunya, 2025-01-01)
Exam
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FÍSICA II (Examen final 1r quadrimestre)
(Universitat Politècnica de Catalunya, 2025-01-01)
Exam
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FÍSICA II (Examen final 2n quadrimestre)
(Universitat Politècnica de Catalunya, 2025-04-01)
Exam
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FÍSICA II (Examen parcial 1r quadrimestre)
(Universitat Politècnica de Catalunya, 2024-10-03)
Exam
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Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements
(2017-04-11)
Article
Open AccessDielectric measurements (thermally stimulated depolarisation currents and broadband dielectric spectroscopy) have been performed near the glass transition to study the glass transition on the odd non-symmetric liquid crystal ... -
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 ...
