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Now showing items 1-20 of 34

    • 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 ...

    • 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 ...

    • 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
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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)
      Article
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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 ...

    • 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 ...

    • 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 ...

    • Dynamics of orientationally disordered mixed crystal sharing Cl-adamantane and CN-adamantane 

      Martínez García, Julio Cesar; Capaccioli, Simon; Díez Berart, Sergio; Tamarit Mur, José Luis; Barrio Casado, María del; Veglio, Néstor Raúl; Pardo Soto, Luis Carlos (2010-01-27)
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      Orientationally disordered (OD) mixed crystals formed between cyanoadamantane (CN-A) and chloroadamantane (Cl-A) have been thermodynamically characterized by means of thermal analysis and X-ray diffraction. The dynamics ...

    • FÍSICA FONAMENTAL I (Examen final 1r quadrimestre) 

      Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; Ristol Roura, Marina; Salud Puig, Josep; Díez Berart, Sergio (Universitat Politècnica de Catalunya, 2025-01-16)
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    • 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 I (Examen final, 1r quadrimestre) 

      Garcia Benadí, Albert; Díez Berart, Sergio; Sánchez Baena, Juan; Levit Valenzuela, Rafael; Salud Puig, Josep; Talavera Sánchez, Pedro (Universitat Politècnica de Catalunya, 2025-03-03)
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    • FÍSICA I (Examen final, 1r quadrimestre) 

      Garcia Benadí, Albert; Díez Berart, Sergio; Levit Valenzuela, Rafael (Universitat Politècnica de Catalunya, 2025-03-03)
      Exam
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    • FÍSICA I (Examen parcial 1r quadrimestre) 

      Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; Ristol Roura, Marina; Salud Puig, Josep; Díez Berart, Sergio (Universitat Politècnica de Catalunya, 2024-10-29)
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    • FÍSICA I (Examen parcial 2n quadrimestre) 

      Garcia Benadí, Albert; Grossi, Claudia; Levit Valenzuela, Rafael; Ristol Roura, Marina; Salud Puig, Josep; Díez Berart, Sergio (Universitat Politècnica de Catalunya, 2025-04-09)
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    • FÍSICA I (Examen parcial, 2n quadrimestre) 

      Díez Berart, Sergio; Grossi, Claudia; Levit Valenzuela, Rafael; Salud Puig, Josep (Universitat Politècnica de Catalunya, 2025-04-09)
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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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