Design and electro-optic investigations of de Vries chiral smectic liquid crystals for exhibiting broad temperature ranges of SmA* and SmC* phases and fast electro-optic switching

2020 ◽  
Vol 8 (14) ◽  
pp. 4859-4868 ◽  
Author(s):  
V. Swaminathan ◽  
V. P. Panov ◽  
A. Panov ◽  
D. Rodriguez-Lojo ◽  
P. J. Stevenson ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Smectic Liquid Crystals ◽  
Switching Speed ◽  
Temperature Range ◽  
Electro Optic ◽  
De Vries ◽  
Temperature Ranges

Two new ferroelectric liquid crystalline compounds using 5-phenyl-pyrimidine core terminated by achiral trisiloxane chain, and chiral (S) alkyl chain on the opposite ends of their respective mesogens are designed with better characteristics of switching speed and broader temperature range.

Electro-optic characteristics of de Vries tilted smectic liquid crystals: Analog behavior in the smectic A* and smectic C* phases

2002 ◽  
Vol 80 (22) ◽  
pp. 4097-4099 ◽  
Author(s):  
N. A. Clark ◽  
T. Bellini ◽  
R.-F. Shao ◽  
D. Coleman ◽  
S. Bardon ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Smectic Liquid Crystals ◽  
Smectic A ◽  
Smectic C ◽  
Electro Optic ◽  
De Vries ◽  
Analog Behavior

scholarly journals A modified Langevin-Debye model for investigating the electro-optic behaviour of de Vries smectic liquid crystals

2018 ◽  
Vol 46 (8) ◽  
pp. 1246-1251 ◽  
Author(s):  
V. Swaminathan ◽  
V.P. Panov ◽  
S.P. Sreenilayam ◽  
Yu. P. Panarin ◽  
J.K. Vij
Keyword(s):  
Liquid Crystals ◽  
Debye Model ◽  
Smectic Liquid Crystals ◽  
Electro Optic ◽  
De Vries

Synthesis and Mesomorphic Properties of Chiral Biphenylol Benzoates

1996 ◽  
Vol 425 ◽  
Author(s):  
Wan-Fang Lu ◽  
Zhi-Yong Zhang ◽  
Yong-Jia Shang
Keyword(s):  
Molecular Structure ◽  
Liquid Crystals ◽  
Phase Behavior ◽  
Liquid Crystalline ◽  
Smectic Liquid Crystals ◽  
Temperature Ranges ◽  
Mesomorphic Properties

AbstractTen new chiral liquid crystalline compounds I1–10 of 4′ -acyl-4-biphenylol (S) -4- (2-methyl-l-butoxy) benzoates were synthesized and their mesomorphic properties were tested. They are all smectic liquid crystals with wide temperature ranges and except for compounds I1, all exhibit a Sc*phase. The influence of molecular structure on phase behavior is discussed.

Tuning ‘de Vries-like’ properties in siloxane- and carbosilane-terminated smectic liquid crystals

2013 ◽  
Vol 1 (2) ◽  
pp. 343-350 ◽  
Author(s):  
Qingxiang Song ◽  
Dorothee Nonnenmacher ◽  
Frank Giesselmann ◽  
Robert P. Lemieux
Keyword(s):  
Liquid Crystals ◽  
Smectic Liquid Crystals ◽  
De Vries

scholarly journals Influence of alkyl chain length and fluorine atoms substitution on infrared spectra of chiral liquid crystalline esters

2017 ◽  
Vol 66 (3) ◽  
pp. 63-74
Author(s):  
Anna Drzewicz ◽  
Marzena Tykarska ◽  
Magdalena Żurowska
Keyword(s):  
Molecular Structure ◽  
Infrared Spectroscopy ◽  
Liquid Crystals ◽  
Infrared Spectra ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Rigid Core ◽  
Helicoidal Structure

The infrared spectra were registered for series of three-ring liquid crystalline esters, differing in the structure of alkyl chain, in the substitution of benzene ring by fluorine atoms and in the type of helicoidal structure in the chiral smectic CA phase with antiferroelectric properties. The influence of molecular structure on the shift of signals coming from carbonyl group, located in the rigid core, was observed. Keywords: liquid crystals, helicoidal structure, chiral smectic CA phase, antiferroelectric crystalline phase, infrared spectroscopy

Synthesis and Mesomorphic Properties of New Liquid Crystalline Cyclohexyl-phenyl- and Dicyclohexyl-pyrimidines

1979 ◽  
Vol 34 (11) ◽  
pp. 1535-1541 ◽  
Author(s):  
Alois Villiger ◽  
Arthur Boiler ◽  
Martin Schadt
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Viscosity Reduction ◽  
Refractive Indices ◽  
Thermal Compatibility ◽  
Chain Lengths ◽  
New Compounds ◽  
Mesomorphic Properties ◽  
End Group

Abstract Liquid Crystals, Cyclohexyl-phenyl-pyrimidines, Dicyclohexyl-pyrimidines The synthesis and mesomorphic properties of three new classes of cyano-substituted cyclohexyl-phenyl-and dicyclohexyl-pyrimidines are reported. The compounds are colourless, chemically and photochemically stable and have wide nematic mesophases. The thermal compatibility of the new compounds with other nematic liquid crystals is excellent. The large static positive dielectric anisotropics are shown to depend strongly on the position and number of hydrogenated rings as well as on the alkyl chain lengths within a homologous series. The reported bulk viscosities vary considerably among homologues. Hydrogenating the ring adjacent to the cyano end group causes η to increase, whereas a considerable viscosity reduction compared to nonhydrogenated homologues was found by hydrogenating the ring adjacent to the alkyl end group. The measured refractive indices of the new compounds are comparable to those of biphenyls.

scholarly journals Design of Ionic Liquid Crystals Forming Normal-Type Bicontinuous Cubic Phases with a 3D Continuous Ion Conductive Pathway

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 309 ◽  
Author(s):  
Takahiro Ichikawa ◽  
Yui Sasaki ◽  
Tsubasa Kobayashi ◽  
Hikaru Oshiro ◽  
Ayaka Ono ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Conductivity ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Normal Type ◽  
Ion Conduction ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Chain Lengths

We have prepared a series of pyridinium-based gemini amphiphiles. They exhibit thermotropic liquid–crystalline behavior depending on their alkyl chain lengths and anion species. By adjusting the alkyl chain lengths and selecting suitable anions, we have obtained an ionic amphiphile that exhibits a normal-type bicontinuous cubic phase from 38 °C to 12 °C on cooling from an isotropic phase. In the bicontinuous cubic liquid–crystalline assembly, the pyridinium-based ionic parts align along a gyroid minimal surface forming a 3D continuous ionic domain while their ionophobic alkyl chains form 3D branched nanochannel networks. This ionic compound can form homogeneous mixtures with a lithium salt and the resultant mixtures keep the ability to form normal-type bicontinuous cubic phases. Ion conduction measurements have been performed for the mixtures on cooling. It has been revealed that the formation of the 3D branched ionophobic nanochannels does not disturb the ion conduction behavior in the ionic domain while it results in the conversion of the state of the mixtures from fluidic liquids to quasi-solids, namely highly viscous liquid crystals. Although the ionic conductivity of the mixtures is in the order of 10–7 S cm–1 at 40 °C, which is far lower than the values for practical use, the present material design has a potential to pave the way for developing advanced solid electrolytes consisting of two task-specific nanosegregated domains: One is an ionic liquid nano-domain with a 3D continuity for high ionic conductivity and the other is ionophobic nanochannel network domains for high mechanical strength.

Experimental study of de Vries properties in antiferroelectric smectic liquid crystals

2008 ◽  
Vol 27 (4) ◽  
pp. 397-405 ◽  
Author(s):  
K. L. Sandhya ◽  
Yu. P. Panarin ◽  
V. P. Panov ◽  
J. K. Vij ◽  
R. Dabrowski
Keyword(s):  
Experimental Study ◽  
Liquid Crystals ◽  
Smectic Liquid Crystals ◽  
De Vries
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