Conformation and Electronic Structure Studies of Molecules at the Col HO - I Phase Transition in Columnar Discotic Liquid Crystal

2003 ◽  
Vol 397 (1) ◽  
pp. 273-283
Author(s):  
V. A. Gunyakov ◽  
S. M. Shibli
Keyword(s):  
Phase Transition ◽  
Electronic Structure ◽  
Liquid Crystal ◽  
Discotic Liquid Crystal

Synthesis and Mesomorphism of a Novel Triphenylene-Based Discotic Liquid Crystal with Chiral Chain

2012 ◽  
Vol 557-559 ◽  
pp. 1062-1065 ◽  
Author(s):  
Ming Xia Zhang ◽  
Yi Fei Wang ◽  
Chun Xiu Zhang ◽  
Hao Wu ◽  
Jia Ling Pu
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Ir Spectra ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Phase Transition Behavior ◽  
Chemical Structures ◽  
Discotic Liquid Crystal ◽  
Ft Ir ◽  
Crystal Compound

A novel triphenylene-based discotic liquid crystal compound was synthesized in this study. The chemical structures of compounds were characterized by 1HNMR spectra, FT-IR spectra and were confirmed. The phase transition behavior was studied in the combination of texture observation by DSC and POM equipped with a temperature-controllable hot-stage. The object compound showed liquid crystal phase and the results showed that columnar liquid crystal phase between 90.1°C and 138.1 °C during heating.

Mesomorphism of Hexa-Peri-Hexabenzocoronene Discotic Liquid Crystals with Odd-Carbon Alkyl Chains

2012 ◽  
Vol 554-556 ◽  
pp. 43-46 ◽  
Author(s):  
Rui Cheng ◽  
Wen Guang Wang ◽  
Teng Zhou Yang ◽  
Yu Jiang ◽  
Jia Ling Pu
Keyword(s):  
Phase Transition ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Liquid Crystal ◽  
Discotic Liquid Crystals ◽  
Scanning Calorimetry ◽  
Alkyl Chains ◽  
Discotic Liquid Crystal ◽  
Phase Transition Temperatures ◽  
The Relationship

A new HBC derivative HBC-C17containing 6 odd-carbon alkyl chains surrounding the hexabenzocoronene core was synthesized, and investigated as discotic liquid crystal along with HBC-C13and HBC-C15. The thermal behaviors have been investigated by using differential scanning calorimetry (DSC). And mesomorphic phase behavior of HBC-C17was observed by polarizing optical microscopy (POM). A remarkable variation in the phase transition temperatures was observed for these three HBC derivatives (HBC-C13, HBC-C15and HBC-C17). Moreover, the mesomorphism of these HBC derivatives can be compared with HBC-C12, HBC-C14and other HBCs with even carbon alkyl chains, meanwhile the relationship between the length of substitutes and thermal properties of HBCs is also studied.

Hexabenzocoronenes Bearing Odd Carbon Alkyl Chains as Columnar Discotic Liquid Crystal

2011 ◽  
Vol 181-182 ◽  
pp. 189-192
Author(s):  
Xu Ying Liu ◽  
Yu Jiang ◽  
Rui Cheng ◽  
Wen Guang Wang ◽  
Jia Ling Pu
Keyword(s):  
Phase Transition ◽  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
Phase Behavior ◽  
Scanning Calorimetry ◽  
Alkyl Chains ◽  
Discotic Liquid Crystal ◽  
Phase Transition Temperatures ◽  
The Difference ◽  
Rigid Plane

Two HBC derivatives (HBC-C13and HBC-C15), both containing 6 odd-carbon alkyl chains surrounding the rigid plane core, were investigated as discotic liquid crystal. The difference between their thermal behaviors has been investigated by using differential scanning calorimetry (DSC). Their mesomorphic phase behavior was observed by polarizing optical microscopy (POM). A remarkable odd-even effect in the phase transition temperatures was observed for all HBC derivatives (HBC-C12, HBC-C13, HBC-C14, HBC-C15and HBC-C16).

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

Characterization of some mesogenic alkyl 1-thioglycosides

2002 ◽  
Vol 80 (8) ◽  
pp. 1162-1165 ◽  
Author(s):  
B Henrissat ◽  
G K Hamer ◽  
M G Taylor ◽  
R H Marchessault
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Solid State ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
Liquid Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Crystalline Phases

A series of dodecyl 1-thio-β-D-glycosides has been synthesized and characterized (DSC, NMR, CP MAS, X-ray diffraction) as possible new marking materials with liquid-crystalline properties. These compounds undergo solid to liquid crystal phase transitions at various temperatures, which depend on the nature of the carbohydrate part of the structure. Their liquid-crystalline phases show extreme shear thinning behaviour.Key words: liquid crystal, powder X-ray diffraction, phase transition, thioglycoside, solid-state NMR, marking material

Synthesis and mesomorphism of diacetylene-bridged triphenylene discotic liquid crystal dimers

2009 ◽  
Vol 52 (7) ◽  
pp. 975-985 ◽  
Author(s):  
Hong Ji ◽  
KeQing Zhao ◽  
WenHao Yu ◽  
BiQin Wang ◽  
Pin Hu
Keyword(s):  
Liquid Crystal ◽  
Discotic Liquid Crystal

Phase Transition Detection in Liquid Crystal Analysis By Mathematical Morphology

2021 ◽  
pp. 117015
Author(s):  
A. Farinha ◽  
F.C. Flores ◽  
A.R. Sampaio ◽  
N.M. Kimura ◽  
F.C.M. Freire
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Mathematical Morphology

Nematic-nematic phase transition in the liquid crystal dimer CBC9CB and its mixtures with 5CB: A high-resolution adiabatic scanning calorimetric study

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
Chandra Shekhar Pati Tripathi ◽  
Patricia Losada-Pérez ◽  
Christ Glorieux ◽  
Alexandra Kohlmeier ◽  
Maria-Gabriela Tamba ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
High Resolution ◽  
Nematic Phase ◽  
Calorimetric Study
Sign in / Sign up

Export Citation Format

Share Document