Multipodal Liquid-Crystalline Materials based on Ferrocene Cores

2001 ◽  
Vol 709 ◽  
Author(s):  
T. Meyer ◽  
R. Elsäßer ◽  
K. J. Shepperson ◽  
D. Vos ◽  
B. Donnio ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Liquid Crystalline Materials ◽  
Phase Properties

ABSTRACTThe synthesis of multipodes based on substituted ferrocene groups and the results of the investigations of the liquid-crystalline phase properties of these materials, determined by optical polarising microscopy DSC and X-ray diffraction studies as central cores is reported.

A new liquid crystalline phase in phosphatidylcholine bilayers as studied by X-ray diffraction

1994 ◽  
Vol 69 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Ichiro Hatta ◽  
Sinzi Matuoka ◽  
Michael A. Singer ◽  
Leonard Finegold
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
X Ray Diffraction ◽  
X Ray

Molecular Arrangement of Alkylated Fullerenes in the Liquid Crystalline Phase Studied with X-ray Diffraction

Langmuir ◽  
2010 ◽  
Vol 26 (6) ◽  
pp. 4339-4345 ◽  
Author(s):  
Paulo A. L. Fernandes ◽  
Shiki Yagai ◽  
Helmuth Möhwald ◽  
Takashi Nakanishi
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Arrangement

Lipase action on a monoolein/sodium oleate aqueous cubic liquid crystalline phase—a NMR and X-ray diffraction study

2002 ◽  
Vol 26 (1-2) ◽  
pp. 159-171 ◽  
Author(s):  
Francesca Caboi ◽  
Johanna Borné ◽  
Tommy Nylander ◽  
Ali Khan ◽  
Allan Svendsen ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Sodium Oleate ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
X Ray Diffraction ◽  
X Ray

Dendritic and Multipodal Liquid-Crystalline Materials based on Silsesquioxane and Siloxane Cores

2000 ◽  
Vol 628 ◽  
Author(s):  
Georg H. Mehl ◽  
Ralf Elsäβer ◽  
Keith J. Shepperson ◽  
Adam Thornton ◽  
John W. Goodby
Keyword(s):  
Crystalline Phase ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Phase Behaviour ◽  
Liquid Crystalline Phase ◽  
Stability Range ◽  
Inorganic Hybrid ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials ◽  
Made In

ABSTRACTIn recent years great advances have been made in the synthesis of organic-inorganic hybrid materials, whether they are oligomeric, multipodal, polymeric or dendritic in structure. Of particular interest are liquid-crystalline systems, as the control of the soft self-assembly behaviour of these systems allows for the addressing of the macroscopic properties of these materials.The investigations of silsesquioxane and siloxane cores decorated with suitable organic groups of linear and branched structures leading to liquid-crystalline phase behaviour is presented. The structural and chemical features which govern the phase behaviour will be discussed. Important features are the size, geometry, structure and flexibility of the inorganic core, the flexibility, branching and length of the spacer linking inorganic cores and the organic groups, which promote liquid-crystalline phase behaviour. The effects of a variety of mesogenic structures on the liquid-crystalline phase behaviour and stability range will be discussed.

scholarly journals The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 735 ◽  
Author(s):  
Helena Skopalová ◽  
Petr Špaček ◽  
Václav Kozmík ◽  
Jiří Svoboda ◽  
Vladimíra Novotná ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Structural Parameters ◽  
Phase Identification ◽  
Crystalline Materials ◽  
X Ray ◽  
Alkyl Chains ◽  
Calorimetric Measurements ◽  
Liquid Crystalline Materials ◽  
Mesomorphic Properties

We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compounds substituted with fluorine are mesogenic and exhibit one mesophase, whose type differs when prolonging the terminal alkyl chain. For homologues with shorter alkyl chains (octyl, decyl), a columnar B1-type of a mesophase was observed, while materials with longer terminal chains (dodecyl, tetradecyl) exhibited a switchable lamellar SmCAPA phase. Calorimetric measurements, texture observations under a polarizing microscope were performed and electro-optical properties studied. Additionally, dielectric measurements were realized to characterize the molecular dynamics in the SmCAPA phase. All mesogenic compounds were further studied by X-ray measurements to confirm phase identification and obtain more information about their structural parameters.

scholarly journals Mesomorphism behaviour and photoluminescent properties of new asymmetrical 1,2-di(4-alkoxybenzylidene)hydrazines

2019 ◽  
Vol 43 (1-2) ◽  
pp. 67-77 ◽  
Author(s):  
Adil A Awad ◽  
Al-Ameen Bariz OmarAli ◽  
Ahmed Jasim M Al-Karawi ◽  
Zyad Hussein J Al-Qaisi ◽  
Samer Ghanim Majeed
Keyword(s):  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Polarized Light ◽  
Luminescent Properties ◽  
Scanning Calorimetry ◽  
Crystalline Materials ◽  
X Ray ◽  
Step Procedure ◽  
Liquid Crystalline Materials

{1-[4-( n-Alkoxy)]-2-(4’-decyloxy)benzylidene}hydrazines ( n-alkoxy = O(CH2) nH, n = 1–9, 12, 16 or 18), an asymmetrical series of 1,2-disubstituted hydrazines, were prepared in a simple two-step procedure as a part of our continuing work in evaluating hydrophobic azine compounds as photoluminescent liquid crystalline materials. The compounds were characterized spectroscopically and their liquid crystalline behaviour and luminescent properties were evaluated using polarized light optical microscopy, differential scanning calorimetry and X-ray powder diffraction techniques. The studies revealed that all of these compounds are liquid crystalline materials exhibiting photoluminescent properties in the crystalline and liquid crystal states.

Fabrication of polycrystalline thin films of liquid crystalline materials by solution process and its application to OFETs

2008 ◽  
Vol 1091 ◽  
Author(s):  
Hiroaki Iino ◽  
Jun-ichi Hanna
Keyword(s):  
Thin Films ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Solution Process ◽  
Crystalline Material ◽  
Crystalline Materials ◽  
Polycrystalline Thin Films ◽  
Channel Performance ◽  
Liquid Crystalline Materials ◽  
Liquid Crystalline Material

AbstractWe have fabricated polycrystalline OFETs of two different liquid crystalline materials i.e., ω,ω'-dihexylquaterthipohene (6-QTP-6) and N, N'-ditridecylperylenediimide (13-Per-13) by solution process. Liquid crystalline materials help fabricating uniform thin films on the substrate when spin-coated at their temperature range of liquid crystalline phase. The FETs fabricated with 6-QTP-6 exhibited p-channel performance and its mobility was determined to be 0.04 cm2/Vs, which was comparable to that determined by time-of-flight experiments. The FETs fabricated with 13-Per-13 exhibited n-channel performance and its FET mobility was 0.008 cm2/Vs, while the mobility was increased up to 0.11 cm2/Vs after thermal annealing of the film at a liquid crystalline temperature of 220°C for an hour. Judging from these facts, the grain boundaries are controlled not so as to across the conduction channels formed by self-aligned π-conjugated aromatic cores in liquid crystalline molecules. We conclude that liquid crystalline material is a good candidate for quality polycrystalline thin films for OFETs.

Lamellar Liquid Crystalline Materials Modulated by 1-Ethyl-3-Methylimidazolium Hexafluorophosphate

2014 ◽  
Vol 1025-1026 ◽  
pp. 760-764
Author(s):  
Guo Dong Zhang ◽  
Wen Chang Zhuang ◽  
Jing Tian ◽  
Chang Cheng Zhang ◽  
Long Li Zhang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Lamellar Phase ◽  
Tetraethylene Glycol ◽  
Imidazolium Salt ◽  
Polarized Optical Microscopy ◽  
Crystalline Materials ◽  
X Ray ◽  
X Ray Scattering ◽  
Lauryl Ether ◽  
Liquid Crystalline Materials

Liquid crystal was formed in a ternary system of tetraethylene glycol lauryl ether, water and 1-ethyl-3-methylimidazolium hexafluorophosphate. Its structure was identified by polarized optical microscopy and small-angle X-ray scattering techniques. Compared to that in the binary system, lamellar phase was retained with the addition of a small amount of imidazolium salt. Molecules of 1-ethyl-3-methylimidazolium hexafluorophosphate were considered to be solubilized in the polar domain of the ordered assemblies. Results on their influence on the lamellar phase enlighten the use of imidazolium salts to modulate liquid crystalline materials and other assemblies.

scholarly journals Perhydroazulene-based liquid-crystalline materials with smectic phases

2012 ◽  
Vol 8 ◽  
pp. 403-410 ◽  
Author(s):  
Zakir Hussain ◽  
Henning Hopf ◽  
S Holger Eichhorn
Keyword(s):  
Liquid Crystalline ◽  
X Ray Diffraction ◽  
Core System ◽  
Crystalline Materials ◽  
Smectic Phases ◽  
Differential Scanning Colorimetry ◽  
Temperature Ranges ◽  
Nematic Phases ◽  
Liquid Crystalline Materials ◽  
Mesomorphic Properties

New liquid-crystalline materials with a perhydroazulene core were synthesized and the stereochemistry of these compounds was investigated. The mesomorphic properties of the new LC compounds were investigated by differential scanning colorimetry, polarizing optical microscopy and X-ray diffraction. We report here on the LC properties of nonchiral materials, which predominantly exhibit smectic phases and display nematic phases only within narrow temperature ranges. The dependence of the mesogenic behavior of the new materials on the stereochemistry of the core system was also investigated. All newly synthesized compounds were fully characterized by the usual spectroscopic and analytical methods.

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