scholarly journals The influence of nonextensivity on orientational ordering in liquid crystal systems with variable molecular shape

2005 ◽  
Vol 354 ◽  
pp. 344-354 ◽  
Author(s):  
Ozhan Kayacan
Keyword(s):  
Liquid Crystal ◽  
Molecular Shape ◽  
Orientational Ordering

Liquid Crystal Trimers Incorporating Saturated Isosteres of Benzene and Exhibiting Modulated Nematic Phases

2019 ◽  
Author(s):  
Adam Al-Janabi ◽  
Richard Mandle
Keyword(s):  
Liquid Crystal ◽  
Helical Structure ◽  
Molecular Shape ◽  
Saturated Hydrocarbons ◽  
Fluid System ◽  
Structural Requirement ◽  
Disubstituted Benzene ◽  
Bona Fide ◽  
Nematic Phases ◽  
Bend Angles

<p>The nematic twist-bend (N<sub>TB</sub>) liquid crystal phase possesses a local helical structure with a pitch length of a few nanometres and is the first example of spontaneous symmetry breaking in a fluid system. All known examples of the N­<sub>TB­</sub> phase occur in materials whose constituent mesogenic units are aromatic hydrocarbons. It is not clear if this is due to synthetic convenience or a <i>bona fide</i> structural requirement for a material to exhibit this phase of matter. In this work we demonstrate that materials consisting largely of saturated hydrocarbons could also give rise to this mesophase. Furthermore, replacement of 1,4-disubstituted benzene with <i>trans</i> 1,4-cyclohexane or even 1,4-cubane does not especially alter the transition temperatures of the resulting material nor does it appear to impact upon the heliconical tilt angle, suggesting the local structure of the phase is unperturbed. Calculating the probability distribution of bend angles reveals that the choice of isosteric group has little impact on the overall molecular shape, demonstrating the shape-driven nature of the N<sub>TB</sub> phase. </p>

Monte Carlo study of induced bond orientational ordering in two-dimensional liquid-crystal models

1990 ◽  
Vol 41 (12) ◽  
pp. 6786-6795 ◽  
Author(s):  
M. J. P. Gingras ◽  
P. C. W. Holdsworth ◽  
B. Bergersen
Keyword(s):  
Monte Carlo ◽  
Liquid Crystal ◽  
Monte Carlo Study ◽  
Two Dimensional ◽  
Orientational Ordering

Spontaneous Orientational Ordering of Liquid Crystal Layer During Evaporation onto Silica

2009 ◽  
Vol 512 (1) ◽  
pp. 100/[1946]-108/[1954]
Author(s):  
Dai Taguchi ◽  
Takashi Kawate ◽  
Ryo Miyazawa ◽  
Martin Weis ◽  
Takaaki Manaka ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Orientational Ordering
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