Browsing by Author "Robles Hernández, Beatriz"
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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 (2024-08-01)
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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 ... -
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)
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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 ... -
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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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
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)
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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
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)
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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 ... -
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)
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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 ... -
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)
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Open AccessWe 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) ... -
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)
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Open AccessWe 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 ... -
Twist, tilt, and orientational order at the nematic to twist-bend nematic phase transition of 1 '',9 ''-bis(4-cyanobiphenyl-4 '-yl) nonane: A dielectric, H-2 NMR, and calorimetric study
Robles Hernández, Beatriz; Sebastian Ugarteche, Nerea; Rosario De la Fuente, M.; López Pérez, David Orencio; Díez Berart, Sergio; Salud Puig, Josep; Ros, M. Blanca; Dunmur, D.A.; Luckhurst, G.R.; Timimi, Bakir A. (2015-12-02)
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Open AccessThe nature of the nematic-nematic phase transition in the liquid crystal dimer 1 '',9 ''-bis(4-cyanobiphenyl-4'-yl) nonane (CB9CB) has been investigated using techniques of calorimetry, dynamic dielectric response measurements, ... -
Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with gamma-alumina nanoparticles
Díez Berart, Sergio; López Pérez, David Orencio; Salud Puig, Josep; Diego Vives, José Antonio; Sellarès González, Jordi; Robles Hernández, Beatriz; De la Fuente, Maria Rosario; Blanca Ros, María (2015-06-01)
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Open AccessIn the present work, the nematic glassy state of the non-symmetric LC dimer -(4-cyanobiphenyl-4-yloxy)--(1-pyrenimine-benzylidene-4-oxy) undecane is studied by means of calorimetric and dielectric measurements. The most ... -
Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4'-yloxy)-6-(4-cyanobiphenyl-4'--yl)hexane (CB6OCB) and comparison with CB7CB
Paterson, Daniel A.; Gao, Min; Kim, Young-Ki; Robles Hernández, Beatriz; Díez Berart, Sergio; Salud Puig, Josep; López Pérez, David Orencio (2016-08-28)
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Open AccessThe synthesis and characterisation of the nonsymmetric liquid crystal dimer, 1-(4-cyanobiphenyl-40-yloxy)-6- (4-cyanobiphenyl-40-yl)hexane (CB6OCB) is reported. An enantiotropic nematic (N)–twist-bend nematic (NTB) phase ...