First Examples of de Vries-like Smectic A to Smectic C Phase Transitions in Ionic Liquid Crystals

ChemPhysChem ◽  
2016 ◽  
Vol 17 (24) ◽  
pp. 4116-4123 ◽  
Author(s):  
Nadia Kapernaum ◽  
Carsten Müller ◽  
Svenja Moors ◽  
M. Christian Schlick ◽  
Eugen Wuckert ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Phase Transitions ◽  
Liquid Crystals ◽  
Smectic A ◽  
Smectic C ◽  
De Vries ◽  
Ionic Liquid Crystals

Exploring the potential of europium(iii) luminescence for the detection of phase transitions in ionic liquid crystals

2007 ◽  
Vol 17 (7) ◽  
pp. 654-657 ◽  
Author(s):  
Joël Kocher ◽  
Frédéric Gumy ◽  
Anne-Sophie Chauvin ◽  
Jean-Claude G. Bünzli
Keyword(s):  
Ionic Liquid ◽  
Phase Transitions ◽  
Liquid Crystals ◽  
Ionic Liquid Crystals

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 NMR Spectroscopic Study of Orientational Order in Imidazolium-Based Ionic Liquid Crystals

Crystals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 495 ◽  
Author(s):  
Jing Dai ◽  
Debashis Majhi ◽  
Boris B. Kharkov ◽  
Sergey V. Dvinskikh
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Structural Model ◽  
Orientational Order ◽  
Smectic Layer ◽  
Charge Delocalization ◽  
Smectic A ◽  
Counter Ions ◽  
Bonding Properties ◽  
Ionic Liquid Crystals

We report on molecular and local orientational order of a series of imidazolium-based ionic liquid crystals exhibiting layered smectic A mesophase. Materials constituting of 1-dodecyl-3-methylimidazolium cation, and different counter-ions, were investigated. We apply two-dimensional 13C-1H dipolar NMR spectroscopy to quantify orientational order of C-H bonds of the organic cation. The experimental data supported the structural model of the interdigitated chains aligned with the smectic layer normal. Molecular order parameter S was found to increase in the anion sequence BF4− < I− < Br− < Cl−. This trend correlates well with ionic radius, negative charge delocalization, and hydrogen-bonding properties of the anions.

Dynamics near the nematic—smectic-A and nematic—smectic-C phase transitions in liquid crystals

1979 ◽  
Vol 19 (1) ◽  
pp. 432-440 ◽  
Author(s):  
Khurshid A. Hossain ◽  
J. Swift ◽  
Jing-Huei Chen ◽  
T. C. Lubensky
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
Smectic A ◽  
Smectic C ◽  
Transitions In Liquid Crystals

From Channel-Forming Ionic Liquid Crystals Exhibiting Humidity-Induced Phase Transitions to Nanostructured Ion-Conducting Polymer Membranes

2013 ◽  
Vol 25 (26) ◽  
pp. 3543-3548 ◽  
Author(s):  
Heng Zhang ◽  
Lei Li ◽  
Martin Möller ◽  
Xiaomin Zhu ◽  
Jaime J. Hernandez Rueda ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Phase Transitions ◽  
Liquid Crystals ◽  
Conducting Polymer ◽  
Polymer Membranes ◽  
Ionic Liquid Crystals ◽  
Ion Conducting ◽  
Ion Conducting Polymer

Orientational Fluctuations Near the Smectic A to Smectic C Phase Transition in Two “de Vries”-Type Liquid Crystals

ChemPhysChem ◽  
2013 ◽  
Vol 14 (13) ◽  
pp. 2990-2995 ◽  
Author(s):  
Dorothee Nonnenmacher ◽  
Stefan Jagiella ◽  
Qingxiang Song ◽  
Robert P. Lemieux ◽  
Frank Giesselmann
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Smectic A ◽  
Smectic C ◽  
De Vries

Viologen-based ionic liquid crystals: induction of a smectic A phase by dimerisation

2014 ◽  
Vol 16 (11) ◽  
pp. 5048-5051 ◽  
Author(s):  
Girolamo Casella ◽  
Valerio Causin ◽  
Federico Rastrelli ◽  
Giacomo Saielli
Keyword(s):  
Ionic Liquid ◽  
High Temperature ◽  
Liquid Crystals ◽  
Smectic A ◽  
Smectic A Phase ◽  
Ionic Liquid Crystals

Not just a tale of tails. Viologen dimer salts of bistriflimide exhibit rich mesomorphism, including a high temperature SmA phase which is not observed for the corresponding monomers.

Ferroelectric polysiloxane liquid crystals with ‘de Vries’-type smectic A*–smectic C* transitions

2004 ◽  
Vol 31 (6) ◽  
pp. 883-887 ◽  
Author(s):  
M. Rössle ◽  
R. Zentel ◽  
J. P. F. Lagerwall ◽  
F. Giesselmann
Keyword(s):  
Liquid Crystals ◽  
Smectic A ◽  
Smectic C ◽  
De Vries

Cyanobiphenyl versus Alkoxybiphenyl: Which Mesogenic Unit Governs the Mesomorphic Properties of Guanidinium Ionic Liquid Crystals?

2014 ◽  
Vol 67 (7) ◽  
pp. 1088 ◽  
Author(s):  
Johannes Christian Haenle ◽  
Manuel M. Neidhardt ◽  
Stuart Beardsworth ◽  
Jochen Kirres ◽  
Angelika Baro ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Head Group ◽  
Substitution Pattern ◽  
Smectic A ◽  
Mesophase Formation ◽  
Mesogenic Unit ◽  
Ionic Liquid Crystals ◽  
Mesomorphic Properties ◽  
Thermal Stability Of

A series of phenylguanidinium salts 3·X, which are linked via an alkoxy spacer either to a 4-decyloxy- or 4-cyano-substituted biphenyl mesogen, was prepared and the mesomorphism studied. A decyloxybiphenyl core and a spacer of at least C6 chain length were required for mesophase formation. Replacement of the chloride counterion by other anions like bromide or tetrafluoroborate improved the thermal stability of the mesophase. A comparison of substitution pattern (meta v. para) on the phenyl ring revealed decreased melting and clearing points for the bent cationic head group. All guanidinium ionic liquid crystals 3 displayed only smectic A (SmA) phases. A packing model is assumed where the molecules in a bilayer stack over each other in opposite direction with interdigitated terminal decyloxy groups and spacers.

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