Uniaxial to biaxial nematic phase transition in a bent-core thermotropic liquid crystal by polarising microscopy

2012 ◽  
Vol 39 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Stephen J. Picken ◽  
Theo J. Dingemans ◽  
Louis A. Madsen ◽  
Oriano Francescangeli ◽  
Edward T. Samulski
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Thermotropic Liquid Crystal ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

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.

A new soap/detergent/water lyotropic liquid crystal with a biaxial nematic phase

1989 ◽  
Vol 5 (6) ◽  
pp. 1669-1675 ◽  
Author(s):  
E. A. Oliveira ◽  
L. Liebert ◽  
A. M. Figueiredo Neto
Keyword(s):  
Liquid Crystal ◽  
Nematic Phase ◽  
Lyotropic Liquid Crystal ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

Conoscopic image of a biaxial negative in a reentrant discotic – biaxial nematic phase transition

2020 ◽  
pp. 1-6 ◽  
Author(s):  
D.D. Luders ◽  
G.M. Arcolezi ◽  
M.L.G. Pereira ◽  
W.S. Braga ◽  
O.R. Santos ◽  
...  
Keyword(s):  
Phase Transition ◽  
Nematic Phase ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

scholarly journals Domain walls and anchoring transitions mimicking nematic biaxiality in the oxadiazole bent-core liquid crystal C7

Soft Matter ◽  
2015 ◽  
Vol 11 (20) ◽  
pp. 3963-3970 ◽  
Author(s):  
Young-Ki Kim ◽  
Greta Cukrov ◽  
Jie Xiang ◽  
Sung-Tae Shin ◽  
Oleg D. Lavrentovich
Keyword(s):  
Liquid Crystal ◽  
Nematic Phase ◽  
Domain Walls ◽  
Anchoring Transitions ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

“Secondary disclinations” previously considered as evidence of a biaxial nematic phase are shown to be domain walls in a uniaxial nematic phase.

Refractive index measurements in a reentrant discotic nematic–biaxial nematic phase transition

2018 ◽  
Vol 91 (8) ◽  
pp. 833-839 ◽  
Author(s):  
W.S. Braga ◽  
D.D. Luders ◽  
O.R. Santos ◽  
A.R. Sampaio ◽  
N.M. Kimura ◽  
...  
Keyword(s):  
Phase Transition ◽  
Refractive Index ◽  
Nematic Phase ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase
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