Elastic, dielectric and optical constants of 4'-pentyl-4-cyanobiphenyl

Abstract.A two-dimensional model of Fredericks effect was used for the investigation of the static electric field influence on nematic liquid crystal director orientation in the side-electrode cell. The solutions of the equations describing the model were obtained by finite-difference methods. Fredericks transition threshold for the central part of the cell, as well as dependencies of the distribution of the director orientation patterns on the electric field and location, were obtained. The numerical results are found to agree qualitatively with the experiment. Further investigations are needed to elucidate completely the Fredericks effect.

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“…Changes of the director orientation in a cell with initially homeotropic oriented NLC, subjected to a pulse-periodic electric field [4].…”

Section: Results Of Calculation and Discussionmentioning

confidence: 99%

“…Here K = 0.5 (K 11 + K 33 ), with a splay elastic constant K 11 = 7 · 10 −12 N, a bend elastic constant K 33 = 10 −13 N [4], the dielectric constant of the vacuum ε 0 = 8.854 · 10 −12 F/m, the dielectric anisotropy …”

Section: Mathematical Formulation Of the Problemmentioning

confidence: 99%

Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

et al. 2018

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“…As LCs with medium birefringence, we used commonly-known nematics: PCB 4'-pentyl-4-cyanobiphenyl [21] and 6CHBT 4-(trans-4-hexyl-cyclohexyl)-isothiocyanatobenzene [22]. Thermal characteristics of the refractive indices for these LCs are shown in Fig.…”

Section: Photonic Liquid Crystal Fibers: Materials and Experimental Mmentioning

confidence: 99%

Photonic liquid crystal fibers — a new challenge for fiber optics and liquid crystals photonics

Woliński

Ertman

Lesiak

et al. 2006

Opto-Electronics Review

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The paper reviews and discusses the latest developments in the field of the photonic liquid crystal fibers that have occurred for the last three years in view of new challenges for both fiber optics and liquid crystal photonics. In particular, we present the latest experimental results on electrically induced birefringence in photonic liquid crystal fibers and discuss possibilities and directions of future developments.

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“…1(a), the LC (5CB) layer acts as a sensing layer as well as a gate insulator in the present LC-g-OFET touch sensors. Due to the high dipole feature of 5CB (dielectric constant = 11), 20,22 it is expected that a small stimulation by external physical touch can affect the LC alignment controlled by the gate electric field (V G ). Considering the real dimension of LC-g-OFET devices (channel length = 15 μm) (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Touch sensors based on planar liquid crystal-gated-organic field-effect transistors

et al. 2014

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Wavelength-selective organic field-effect phototransistors based on dye-doped poly-3-hexylthiophene Applied Physics Letters 89, 092110 (2006) We report a tactile touch sensor based on a planar liquid crystal-gated-organic fieldeffect transistor (LC-g-OFET) structure. The LC-g-OFET touch sensors were fabricated by forming the 10 μm thick LC layer (4-cyano-4 -pentylbiphenyl -5CB) on top of the 50 nm thick channel layer (poly(3-hexylthiophene) -P3HT) that is coated on the in-plane aligned drain/source/gate electrodes (indium-tin oxide -ITO). As an external physical stimulation to examine the tactile touch performance, a weak nitrogen flow (83.3 μl/s) was employed to stimulate the LC layer of the touch device. The LC-g-OFET device exhibited p-type transistor characteristics with a hole mobility of 1.5 cm 2 /Vs, but no sensing current by the nitrogen flow touch was measured at sufficiently high drain (V D ) and gate (V G ) voltages. However, a clear sensing current signal was detected at lower voltages, which was quite sensitive to the combination of V D and V G . The best voltage combination was V D = −0.2 V and V G = −1 V for the highest ratio of signal currents to base currents (i.e., signal-to-noise ratio). The change in the LC alignment upon the nitrogen flow touch was assigned as the mechanism for the present LC-g-OFET touch sensors. C 2014 Author(s)

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Elastic, dielectric and optical constants of 4'-pentyl-4-cyanobiphenyl

Cited by 122 publications

References 24 publications

Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

Photonic liquid crystal fibers — a new challenge for fiber optics and liquid crystals photonics

Touch sensors based on planar liquid crystal-gated-organic field-effect transistors

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