Now showing items 1-20 of 35

    • 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 (2024-08-01)
      Article
      Open Access
      We 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)
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      The 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
      Open Access
      We 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
      Open Access
      We 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)
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      In 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)
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      Broadband 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)
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      This 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
      Open Access
      We 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
      Open Access
      We 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
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      Results 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
      Open Access
      In 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 

      Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Díez Berart, Sergio; López Pérez, David Orencio; Mudarra López, Miguel; Salud Puig, Josep; Sellarès González, Jordi (American Institute of Physics (AIP), 2024-08-07)
      Article
      Open Access
      In 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) 

      López de Rioja, Víctor; Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2024-01-24)
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    • FÍSICA FONAMENTAL II (Examen parcial 1r quadrimestre) 

      López de Rioja, Víctor; Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2024-10-05)
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    • FÍSICA II (Examen final 1r quadrimestre) 

      López de Rioja, Víctor; Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2025-01-01)
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    • FÍSICA II (Examen final 1r quadrimestre) 

      Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López de Rioja, Víctor; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2025-01-01)
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    • FÍSICA II (Examen final 2n quadrimestre) 

      Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López de Rioja, Víctor; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2025-04-01)
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    • FÍSICA II (Examen parcial 1r quadrimestre) 

      Díez Berart, Sergio; Canales Gabriel, Manel; Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; López de Rioja, Víctor; López Pérez, David Orencio; Rodríguez Solá, Raúl; Salud Puig, Josep; Sánchez Baena, Juan; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2024-10-03)
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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 

      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
      Open Access
      Dielectric 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
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      In 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 ...