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.

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.

Self-Assembly-Induced Supramolecular Hexagonal Columnar Liquid Crystalline Phase Using Laterally Attached Nonmesogenic Templates

2000 ◽  
Vol 33 (17) ◽  
pp. 6315-6320 ◽  
Author(s):  
Huilin Tu ◽  
Xinhua Wan ◽  
Yuxiang Liu ◽  
Xiaofang Chen ◽  
Dong Zhang ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Hexagonal Columnar

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.

scholarly journals The search for new amphiphiles: synthesis of a modular, high-throughput library

2014 ◽  
Vol 10 ◽  
pp. 1578-1588 ◽  
Author(s):  
George C Feast ◽  
Thomas Lepitre ◽  
Xavier Mulet ◽  
Charlotte E Conn ◽  
Oliver E Hutt ◽  
...  
Keyword(s):  
High Throughput ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Phase Behaviour ◽  
Liquid Crystalline Phase ◽  
Preliminary Assessment ◽  
Degree Of Unsaturation ◽  
Amphiphilic Compounds ◽  
Head Groups ◽  
Hydrocarbon Chains

Amphiphilic compounds are used in a variety of applications due to their lyotropic liquid-crystalline phase formation, however only a limited number of compounds, in a potentially limitless field, are currently in use. A library of organic amphiphilic compounds was synthesised consisting of glucose, galactose, lactose, xylose and mannose head groups and double and triple-chain hydrophobic tails. A modular, high-throughput approach was developed, whereby head and tail components were conjugated using the copper-catalysed azide–alkyne cycloaddition (CuAAC) reaction. The tails were synthesised from two core alkyne-tethered intermediates, which were subsequently functionalised with hydrocarbon chains varying in length and degree of unsaturation and branching, while the five sugar head groups were selected with ranging substitution patterns and anomeric linkages. A library of 80 amphiphiles was subsequently produced, using a 24-vial array, with the majority formed in very good to excellent yields. A preliminary assessment of the liquid-crystalline phase behaviour is also presented.

The liquid-crystalline phase behaviour of hard spherocylinders with terminal point dipoles

1996 ◽  
Vol 8 (47) ◽  
pp. 9649-9655 ◽  
Author(s):  
Simon C McGrother ◽  
Alejandro Gil-Villegas ◽  
George Jackson
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Phase Behaviour ◽  
Liquid Crystalline Phase ◽  
Terminal Point ◽  
Hard Spherocylinders

The Self-Assembly of a Lipophilic Deoxyguanosine Derivative and the Formation of a Liquid-Crystalline Phase in Hydrocarbon Solvents

1998 ◽  
Vol 81 (11) ◽  
pp. 2078-2092 ◽  
Author(s):  
Giovanni Gottarelli ◽  
Stefano Masiero ◽  
Elisabetta Mezzina ◽  
Gian Piero Spada ◽  
Paolo Mariani ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
The Self ◽  
Liquid Crystalline Phase ◽  
Hydrocarbon Solvents
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