S
S. Diez-Berart
Researcher at Polytechnic University of Catalonia
Publications - 26
Citations - 1059
S. Diez-Berart is an academic researcher from Polytechnic University of Catalonia. The author has contributed to research in topics: Liquid crystal & Phase transition. The author has an hindex of 11, co-authored 24 publications receiving 905 citations. Previous affiliations of S. Diez-Berart include University of the Basque Country & Liquid Crystal Institute.
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Journal ArticleDOI
Phase behavior and properties of the liquid-crystal dimer 1′′,7′′-bis(4-cyanobiphenyl-4′-yl) heptane: A twist-bend nematic liquid crystal
Mirko Cestari,Mirko Cestari,S. Diez-Berart,D. A. Dunmur,Alberta Ferrarini,M. R. de la Fuente,D. J. B. Jackson,David López,Geoffrey R. Luckhurst,M. A. Perez-Jubindo,Robert M. Richardson,Josep Salud,Bakir A. Timimi,Herbert Zimmermann +13 more
TL;DR: It is concluded that the low-temperature mesophase of CB7CB is a new type of uniaxial nematic phase having a nonuniform director distribution composed of twist-bend deformations, and calculations using an atomistic model and the surface interaction potential with Monte Carlo sampling predict dielectric and elastic properties in the nematics phase.
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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
Daniel A. Paterson,Min Gao,Young-Ki Kim,Afsoon Jamali,Kirsten L. Finley,Beatriz Robles-Hernández,S. Diez-Berart,Josep Salud,M. Rosario de la Fuente,Bakir A. Timimi,Herbert Zimmermann,Cristina Greco,Alberta Ferrarini,John Storey,David López,Oleg D. Lavrentovich,Geoffrey R. Luckhurst,Corrie T. Imrie +17 more
TL;DR: A complementary extended molecular field theory was found to be in suggestive accord with the (2)H-NMR studies of CB6OCB-d2, and those already known for CB7CB-d4, including the reduced transition temperature, TNTBN/TNI, and the order parameter of the mesogenic arms in the N phase close to the NTB-N transition.
Journal ArticleDOI
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, 2 H NMR, and calorimetric study
Beatriz Robles-Hernández,Nerea Sebastián,Nerea Sebastián,M. Rosario de la Fuente,David López,S. Diez-Berart,Josep Salud,M. Blanca Ros,D. A. Dunmur,Geoffrey R. Luckhurst,Bakir A. Timimi +10 more
TL;DR: The 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, and (2)H NMR spectroscopy.
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Dielectric and Thermodynamic Study on the Liquid Crystal Dimer α-(4-Cyanobiphenyl-4′-oxy)-ω-(1-pyreniminebenzylidene-4′-oxy)undecane (CBO11O·Py)
Nerea Sebastián,M. R. de la Fuente,David López,David López,M. A. Perez-Jubindo,Josep Salud,S. Diez-Berart,María Blanca Ros +7 more
TL;DR: The nematic-to-isotropic phase transition has been exhaustively studied and it has been concluded that the transition is first order in nature and follows the tricritical hypothesis.
Journal ArticleDOI
Critical behavior and scaling relationships at the SmA(d)-N and N-I transitions in nonyloxycyanobiphenyl (9OCB).
TL;DR: It is proved that both phase transitions are weakly first order, displaying a nearly tricritical behavior, and the width of metastable regions seems to be dependent on the physical magnitude, although specific heat and volumetric determinations allow for comparable results.