Kinetic and thermodynamic studies of phase transition from hexagonal to discotic liquid crystal in metal-free 1,4,8,11,15,18,22,25-octahexylphthalocyanine

2021 ◽  
pp. 1-14
Author(s):  
A.A. Joraid ◽  
S. Y. Al-Raqa
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Thermodynamic Studies ◽  
Metal Free ◽  
Discotic Liquid Crystal ◽  
Kinetic And Thermodynamic Studies

scholarly journals Charge transport properties of a metal-free phthalocyanine discotic liquid crystal

2006 ◽  
Vol 7 (6) ◽  
pp. 495-499 ◽  
Author(s):  
C. Deibel ◽  
D. Janssen ◽  
P. Heremans ◽  
V. De Cupere ◽  
Y. Geerts ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Transport Properties ◽  
Metal Free ◽  
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.

Kinetic and thermodynamic studies of novel acid phosphates extracted from Cichorium intybus seedlings

2021 ◽  
Vol 168 ◽  
pp. 195-204
Author(s):  
Umber Zaman ◽  
Rubina Naz ◽  
Noor Saeed Khattak ◽  
Khalil ur Rehman ◽  
Asma Saeed ◽  
...  
Keyword(s):  
Cichorium Intybus ◽  
Thermodynamic Studies ◽  
Kinetic And Thermodynamic Studies
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