Exploració per autor "López Pérez, David Orencio"
Ara es mostren els items 1-20 de 27
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Anopore confinement in the cyanobiphenyl-based liquid crystal dimer CB7CB. A dielectric study
Robles Hernández, Beatriz; Sebastián, Nerea; de la Fuente Lavin, Maria Rosario; López Pérez, David Orencio; Salud Puig, Josep; Díez Berart, Sergio (2023-12-21)
Article
Accés restringit per política de l'editorialWe 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
Sebastian Ugarteche, Nerea; Gimeno, Nelida; Vergara, Jorge; López Pérez, David Orencio; Serrano, Jose Luis; Folcia, Cesar; de la Fuente, M.R.; Ros, M. Blanca (Royal Society of Chemistry, 2014-01-01)
Article
Accés restringit per política de l'editorialThe 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
Sellarès González, Jordi; Diego Vives, José Antonio; López Pérez, David Orencio; Salud Puig, Josep; Robles Hernández, Beatriz; de la Fuente Lavin, Maria Rosario; Cañadas Lorenzo, Juan Carlos; Mudarra López, Miguel; López de Rioja, Víctor; Levit Valenzuela, Rafael; Díez Berart, Sergio (American Institute of Physics (AIP), 2022-11-21)
Article
Accés obertWe 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
Trull Silvestre, José Francisco; Cuevas, Marc; Salud Puig, Josep; Cojocaru, Crina; López Pérez, David Orencio (2018-05-09)
Article
Accés obertWe 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
López Pérez, David Orencio; Salud Puig, Josep; Rosario De la Fuente, M.; Sebastian Ugarteche, Nerea; Díez Berart, Sergio (American Chemical Society (ACS), 2018-01-17)
Article
Accés restringit per política de l'editorialIn 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)
Fuente, M.R. de la; López Pérez, David Orencio; Pérez Jubindo, M.A.; Dunmur, D.A.; Díez Berart, Sergio; Salud Puig, Josep (American Chemical Society (ACS), 2010-05-05)
Article
Accés restringit per política de l'editorialBroadband 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
Sebastian Ugarteche, Nerea; López Pérez, David Orencio; Robles Hernández, Beatriz; de la Fuente, M.R.; Salud Puig, Josep; Pérez Jubindo, M.A.; Dunmur, D.A.; Luckhurst, G.R.; Jackson, D. J. B. (2014-10-21)
Article
Accés restringit per política de l'editorialThis 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
Díez Berart, Sergio; López Pérez, David Orencio; Sebastian Ugarteche, Nerea; de la Fuente, M.R.; Salud Puig, Josep; Robles Hernández, Beatriz; Pérez Jubindo, M.A. (2014-03-01)
Article
Accés obertWe 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
Sebastian Ugarteche, Nerea; Robles Hernández, Beatriz; Díez Berart, Sergio; Salud Puig, Josep; Luckhurst, G.R.; Dunmur, D. A.; López Pérez, David Orencio; de la Fuente, Maria del Rosario (2017-01-01)
Article
Accés obertWe 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)
Rzoska, Sylwester J.; Drozd-Rzoska, Aleksandra; Mukherjee, Prabir K; López Pérez, David Orencio; Martínez García, Julio Cesar (Institute Of Physics Publishing Ltd, 2013-06)
Article
Accés restringit per política de l'editorialResults 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
Sebastian Ugarteche, Nerea; Zupancic, Blaz; López Pérez, David Orencio; Salud Puig, Josep; López de Rioja, Víctor; Levit Valenzuela, Rafael; de la Fuente Lavin, Maria Rosario; Ros Latienda, Maria Blanca; Díez Berart, Sergio; Robles Hernández, Beatriz (Royal Society of Chemistry (RSC), 2023)
Article
Accés obertIn 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 ... -
Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements
Diego Vives, José Antonio; Sellarès González, Jordi; Díez Berart, Sergio; Salud Puig, Josep; Cañadas Lorenzo, Juan Carlos; Mudarra López, Miguel; López Pérez, David Orencio; de la Fuente Lavin, Maria Rosario; Ros, M Blanca (2017-04-11)
Article
Accés obertDielectric 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
Trull Silvestre, José Francisco; Salud Puig, Josep; Díez Berart, Sergio; López Pérez, David Orencio (American Chemical Society (ACS), 2017-05-30)
Article
Accés restringit per política de l'editorialIn 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 ... -
Influence of the chain length on the nematic-to-isotropic phase transition for the odd members of a highly non-symmetric pyrene-based series of liquid crystal dimers
Salud Puig, Josep; López Pérez, David Orencio; Sebastian Ugarteche, Nerea; De la Fuente, Maria Rosario; Díez Berart, Sergio; Ros Latienda, Maria Blanca (2016-01-02)
Article
Accés restringit per política de l'editorialThis paper describes a detailed study of the nematic (N)-isotropic (I) phase transition in the homologous series of liquid crystal dimers, the a-(4-cyanobiphenyl-4'-oxy)-¿-(1-pyreniminebenzylidene-4'-oxy)alkanes (CBOnO.Py) ... -
Liquid Crystals
Salud Puig, Josep; López Pérez, David Orencio (Springer, 2021-05-23)
Capítol de llibre
Accés obertThe tricritical and the re-entrant nematic behaviour are two of the most relevant features of the Smectic A (SmA)-to-Nematic (N) phase transition in binary mixtures of liquid crystals. Both of these concepts are studied ... -
Liquid-crystalline hybrid materials based on (60) fullerene and bent-core structures
Martín, Nazario; Sánchez, Luis; Vergara, Jorge; Barberá, Joaquín; Serrano, José Luis; Ros, M. Blanca; Sebastián, Nerea; de la Fuente, Rosario; López Pérez, David Orencio; Fernández, Gustavo (2011-12-23)
Article
Accés restringit per política de l'editorialWhat a core-ker! By the appropriate combination of promesogenic bent-core structures and the C60 unit, lamellar polar liquid-crystal phases were induced (see scheme). The supramolecular organization of the functional ... -
Miscibility studies of two twist-bend nematic liquid crystal dimers with different average molecular curvatures. A comparison between experimental data and predictions of a Landau mean-field theory for the NTB-N phase transition
López Pérez, David Orencio; Robles Hernández, Beatriz; Salud Puig, Josep; De la Fuente, Maria Rosario; Sebastian, N.; Díez Berart, Sergio; Jaen, X.; Dunmur, D.A.; Luckhurst, G.R. (2016-01-14)
Article
Accés obertWe report a calorimetric study of a series of mixtures of two twist-bend liquid crystal dimers, the 1'',7''-bis(4-cyanobiphenyl)-4'-yl heptane (CB7CB) and 1''-(2',4-difluorobiphenyl-4'-yloxy)-9''-(4-cyanobiphenyl-4'-yloxy) ... -
Modeling and simulation of joint time-frequency properties of spectrum usage in cognitive radio
Casadevall Palacio, Fernando José; López Benítez, Miguel; López Pérez, David Orencio; Vasilakos, Athanasios V. (2011)
Text en actes de congrés
Accés restringit per política de l'editorialThe development of the Dynamic Spectrum Access/Cogni- tive Radio (DSA/CR) technology can signi cantly bene t from the availability of realistic models able to accurately capture and reproduce the statistical properties ... -
Molecular dynamics of a binary mixture of twist-bend nematic liquid crystal dimers studied by dielectric spectroscopy
Robles Hernández, Beatriz; Sebastian Ugarteche, Nerea; Salud Puig, Josep; Díez Berart, Sergio; Dunmur, D.A.; Luckhurst, G.R.; López Pérez, David Orencio; de la Fuente Lavin, Maria Rosario (American Chemical Society (ACS), 2016-06-21)
Article
Accés obertWe report a comprehensive dielectric characterization of a liquid crystalline binary mixture composed of the symmetric mesogenic dimer CB7CB and the nonsymmetric mesogenic dimer FFO9OCB. In addition to the high-temperature ... -
Self-assembly of Fmoc-tetrapeptides based on the RGDS cell adhesion motif
Alemán Llansó, Carlos; Castelletto, V.; Moulton, C.M.; Cheng, G.; Hamley, I. W.; Hicks, Mathew R.; Rodger, Alison; López Pérez, David Orencio; Revilla López, Guillermo (2011-10-20)
Article
Accés restringit per política de l'editorialSelf-assembly in aqueous solution has been investigated for two Fmoc [Fmoc = N-(fluorenyl)-9-methoxycarbonyl] tetrapeptides comprising the RGDS cell adhesion motif from fibronectin or the scrambled sequence GRDS. The ...