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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Beatriz Robles-HernándezBakir A Timimi

Abstract

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. The experimental results for CB9CB show that, like the shorter homologue CB7CB, the studied material exhibits a normal nematic phase, which on cooling undergoes a transition to the twist-bend nematic phase (N_{TB}), a uniaxial nematic phase, promoted by the average bent molecular shape, in which the director tilts and precesses describing a conical helix. Modulated differential scanning calorimetry has been used to analyze the nature of the N_{TB}-N phase transition, which is found to be weakly first order, but close to tricritical. Additionally broadband dielectric spectroscopy and ^{2}H magnetic resonance studies have revealed information on the structural characteristics of the recently discovered twist-bend nematic phase. Analysis of the dynamic dielectric response in both nematic phases has provided an estimate of the conical angle of the heliconical structure for the N_{TB} phase. Capacitance measurements of the electric-field realignment of the director in initially planar ...Continue Reading

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Citations

Jan 10, 2017·The Journal of Physical Chemistry. B·Srividhya ParthasarathiS Krishna Prasad
Jan 20, 2018·Physical Review. E·Greta BabakhanovaOleg D Lavrentovich
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Mar 15, 2020·Physical Review. E·Martin Čopič, Alenka Mertelj
Jul 15, 2016·Physical Review. E·Beatriz Robles-HernándezM Rosario de la Fuente
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