Fundamentals of Liquid Crystal Devices

Yang, Deng‐Ke; Wu, Shin‐Tson

doi:10.1002/9781118751992

Cited by 429 publications

(368 citation statements)

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“…The values of entropy (ΔS) were calculated by free Gipps relationship (ΔG) [31] at every degree of thermal transition in crystal phase, mesophase and isotropic phase as in Equations (1)(2)(3)(4)(5)(6).…”

Section: Differential Scanning Calorimetry (Dsc) Studymentioning

confidence: 99%

“…The electrical conductivity of solutions of prepared derivatives can be determined by taking about 0.1 g from derivatives (1)(2)(3)(4)(5) and dissolved in 100 mL ethanol, then put the electrode inside a sample solution with 0.002 M concentration in the experiment [25].…”

Section: The Electrical Conductivitymentioning

confidence: 99%

“…Historically, the first liquid crystalline compound was discovered by the Austrian botanist, Friedrich Reinitzer in 1888 [7]. He had observed that when first heating of cholesteryl benzoate showed not a clear liquid state, but when increase the heating produced a clear liquid [8]. Liquid crystalline phases can be classified into two classes: Lyotropic LC and Thermotropic LC [9].…”

Section: Introductionmentioning

confidence: 99%

“…Liquid crystals are mesophases between a crystalline phase (Solid phase) and isotropic phase (Liquid phase) [5,6]. Historically, the first liquid crystalline compound was discovered by the Austrian botanist, Friedrich Reinitzer in 1888 [7].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, physical and biological properties of some cholesterol derivatives

2016

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A series of new cholesterol derivatives have been prepared via Mitsunobu reaction. The reaction was monitored by thin-layer chromatography (TLC) technique. All new compounds were characterized by melting points, elemental analysis, FT-IR, 1 H, 13 C and 2D-NMR spectroscopy. The antibacterial and antifungal activity of these derivatives was also determined. The phase transitions of the prepared derivatives were measured with the aid of differential scanning calorimetry. The textures of the mesophases have been determined with a hot stage equipped polarizing microscope, also the electrical conductivity of the solutions of these liquid crystals measured by electrical conductivity meter. The analysis showed that these prepared derivatives were liquid crystals.

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Section: Differential Scanning Calorimetry (Dsc) Studymentioning

confidence: 99%

Section: The Electrical Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, physical and biological properties of some cholesterol derivatives

2016

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“…Mahler et al [8] originally reported smectic ordering for F 10 H 10 . This finding had a great impact to the field of liquid crystals chemistry as in traditional approach it was commonly believed that smectogenic molecules require rigid, rod-like moiety (represented by aromatic core, build usually from biphenyl ring, or multiple bonds) that is extended by one or two flexible aliphatic chains [9]. Neither completely flexible molecules (which do not have orientational order) nor purely rigid compounds (which transform directly from the isotropic liquid phase at high temperature to the crystalline solid phase at low temperature) were found to form liquid crystalline phases.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and thermal behavior of triblock semifluorinated n-alkanes

Chachaj‐Brekiesz

Górska

Osiecka

et al. 2015

J Therm Anal Calorim

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A series of semifluorinated long-chain triblock alkanes of the general formula: H(CH 2 ) n (CF 2 ) 6 (CH 2 ) n H, abbreviated as H n F 6 H n , where n = 12, 14, 16, 18 and 20, have been synthesized in two steps, by radical addition of 1,6-diiodoperfluorohexane I(CF 2 ) 6 I to two equivalents of an appropriate terminal alkene CH 2 = CH(CH 2 ) n-2 H, followed by subsequent deiodination. This novel class of molecules has been subjected for the first time for thermal characterization. Although the structure of these compounds differs from that typical for liquid crystals, the investigated herein (alkyl)-fluoroalkyl-(alkyl) triblocks were found to exhibit thermotropic liquid crystalline phases. Phase polymorphism of the synthesized compounds was investigated upon both heating and cooling, in the temperature range of 270-360 K, using differential scanning calorimetry (DSC). Additionally, polarized optical microscopy was applied in order to identify the phases and characterize the phase transitions on the base of their textures. In the investigated temperature range, the measured compounds exhibit rich phase polymorphism, including different types of liquid crystalline phases (e.g., smectic A, smectic B and smectic E). Upon analyzing DSC results, it can be concluded that for compounds with n = 16, 18 and 20 all the detected phase transitions (crystalline $ smectic, between smectic phases, smectic $ isotropic) shift toward higher temperature with increasing in the hydrocarbon chain length. The phase situation for compounds with n = 12 and 14 is slightly different. However, for all the studied compounds, it can be observed that the longer hydrocarbon chain, the higher temperature of the phase transition to the isotropic phase. No metastable phases were observed.

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Liquid Crystal Displays

2020

Introduction to Flat Panel Displays

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Fundamentals of Liquid Crystal Devices

Cited by 429 publications

References 0 publications

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

Synthesis and thermal behavior of triblock semifluorinated n-alkanes

Liquid Crystal Displays

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