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Articles 1 - 6 of 6
Full-Text Articles in Physics
Polar Bent-Shape Liquid Crystals - From Molecular Bend To Layer Splay And Chirality, Antal Jakli, A. Eremin
Polar Bent-Shape Liquid Crystals - From Molecular Bend To Layer Splay And Chirality, Antal Jakli, A. Eremin
Antal Jakli
Considerable progress has been achieved in understanding the fascinating structure and physical properties of the ferroelectric liquid crystalline phases formed by bent-core liquid crystals (BLC). In this review, we discuss a manifold of polar structures and phases found in BLCs such as orthogonal and tilted ferro-/antiferroelectric phases, smectic phases, switchable columnar phases, modulated structures and phases stabilised by a periodic lattice of defects such as dark conglomerate and nanofilament phases. We review the theoretical aspects of ferroelectricity in BLCs including existing microscopic theories and computer simulations, polarity and chirality phenomena. The last part of the paper is devoted to the …
Alignment By Langmuir/Schaefer Monolayers Of Bent-Core Liquid Crystals, Wilder Iglesias, Timothy Smith, Prem Basnet, Sharon Stefanovic, Carsten Tschierske, Daniel Lacks, Antal Jakli, Elizabeth Mann
Alignment By Langmuir/Schaefer Monolayers Of Bent-Core Liquid Crystals, Wilder Iglesias, Timothy Smith, Prem Basnet, Sharon Stefanovic, Carsten Tschierske, Daniel Lacks, Antal Jakli, Elizabeth Mann
Antal Jakli
Langmuir films of bent-core molecules at the air/water interface are transferred onto a solid surface by the inverse-Langmuir-Schaefer (ILS) technique. Previous work by the authors demonstrated that ILS films of a symmetric bent-core molecule can serve as effective planar alignment layers for a nematic bent-core liquid crystal cell, but the Langmuir films were unstable and formed multilayers at very low pressures. Here, films of bent-core molecules with one hydrophilic end connected to the bent core by a short aliphatic chain are tested as alignment layers. The hydrophilic group led to much more stable Langmuir films, and also to a molecular …
Liquid Crystalline Amorphous Blue Phase And Its Large Electrooptical Kerr Effect, Khoa Le, Satoshi Aya, Yuji Sasaki, Hyunhee Choi, Fumito Araoka, Kenji Ema, Jozef Mieczkowski, Antal Jákli, Ken Ishikawa, Hideo Takezoe
Liquid Crystalline Amorphous Blue Phase And Its Large Electrooptical Kerr Effect, Khoa Le, Satoshi Aya, Yuji Sasaki, Hyunhee Choi, Fumito Araoka, Kenji Ema, Jozef Mieczkowski, Antal Jákli, Ken Ishikawa, Hideo Takezoe
Antal Jakli
An amorphous blue phase III with low and wide thermal range (similar to 20 degrees C) including room temperature is induced by doping a bent-core nematic with a strong chiral material. We confirm that the electrooptical response is due to the Kerr effect, with the Kerr constant being up to two orders of magnitude larger than conventional Kerr materials such as nitrobenzene.
Stable Amorphous Blue Phase Of Bent-Core Nematic Liquid Crystals Doped With A Chiral Material, Stefanie Taushanoff, Khoa Le, Jarrod Williams, Robert Twieg, B. Sadashiva, Hideo Takezoe, Antal Jakli
Stable Amorphous Blue Phase Of Bent-Core Nematic Liquid Crystals Doped With A Chiral Material, Stefanie Taushanoff, Khoa Le, Jarrod Williams, Robert Twieg, B. Sadashiva, Hideo Takezoe, Antal Jakli
Antal Jakli
We report an induction of the blue phase III (BPIII) at a relatively low and wide ( over 20 degrees C) temperature range in nematogenic achiral bent-core liquid crystals doped with a high twisting power chiral material. The pitch decreases with increasing chiral dopant ratio, and easily reaches the ultraviolet wavelength, so that completely dark texture is obtained under crossed polarizers. Electrooptical switching was achieved in a time range of a few to a few tens of milliseconds. We propose for the stabilization of BPIII that broad-temperature range smectic nano-clusters inhibit the long-range order of the double twisted helical structures, …
Odd-Even Effects In Bent-Core Compounds Containing Terminal N-Alkyl Carboxylate Groups, S. Umadevi, Antal Jakli, B. Sadashiva
Odd-Even Effects In Bent-Core Compounds Containing Terminal N-Alkyl Carboxylate Groups, S. Umadevi, Antal Jakli, B. Sadashiva
Antal Jakli
A homologous series of eleven five-ring symmetrical bent-core compounds containing terminal n-alkyl carboxylate groups were synthesized, characterized and their dielectric and electro-optical properties have been investigated. The lower homologues (n = 6-11) of the series show B-2 structures with an interesting odd-even effect concerning their local director tilt and polar arrangements. This odd-even effect probably is due to steric (entropic) reasons, which are not suppressed by the relatively low polar interaction. Three of the middle homologues display a B-7' phase, which is bistable and shows linear electro-optical switching with a transition to the chiral antiferroelectric smectic phase at a lower …
Fluorine Containing Nonsymmetrical Five-Ring Achiral Banana-Shaped Compounds With Columnar And Synclinic Antiferroelectric Layered Phases, Channabasaveshwar Yelamaggad, Indudhara Shashikala, Uma Hiremath, Guangxun Liao, Antal Jakli, Doddamane Shankar Rao, Subbarao Prasada, Quan Li
Fluorine Containing Nonsymmetrical Five-Ring Achiral Banana-Shaped Compounds With Columnar And Synclinic Antiferroelectric Layered Phases, Channabasaveshwar Yelamaggad, Indudhara Shashikala, Uma Hiremath, Guangxun Liao, Antal Jakli, Doddamane Shankar Rao, Subbarao Prasada, Quan Li
Antal Jakli
The phase transitional behavior of two homologous series of five-ring banana-shaped compounds comprising fluorine substituents synthesized through covalent linking of two chemically dissimilar rod-like anisometric cores (arms) to central 1,3-phenylene is reported. The novelty of these molecules originates from the fact that the molecules are highly nonsymmetrical. One of the arms, which is either salicylaldimine or Schiff base core, possesses two vicinal fluorine atoms at the terminal ring having a n-decyloxy tail; while the n-alkyl tail attached to the other arm was varied to realize a homologous series of compounds. The mesophases have been characterized by several complementary studies. The …