scholarly journals Experimental Conditions for the Stabilization of the Lyotropic Biaxial Nematic Mesophase

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 158
Author(s):  
Erol Akpinar ◽  
Antônio Figueiredo Neto
Keyword(s):  
Nematic Phase ◽  
Liquid Crystalline ◽  
Point Of View ◽  
Theoretical Point ◽  
Experimental Conditions ◽  
The Third ◽  
Nematic Phases ◽  
The Stability ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

Nematic phases are some of the most common phases among the lyotropic liquid crystalline structures. They have been widely investigated during last decades. In early studies, two uniaxial nematic phases (discotic, ND, and calamitic, NC) were identified. After the discovery of the third one, named biaxial nematic phase (NB) in 1980, however, some controversies in the stability of biaxial nematic phases began and still continue in the literature. From the theoretical point of view, the existence of a biaxial nematic phase is well established. This review aims to bring information about the historical development of those phases considering the early studies and then summarize the recent studies on how to stabilize different nematic phases from the experimental conditions, especially, choosing the suitable constituents of lyotropic mixtures.

scholarly journals Importance of transverse dipoles in the stability of biaxial nematic phase: A Monte Carlo study

2012 ◽  
Vol 39 (11) ◽  
pp. 1381-1392 ◽  
Author(s):  
Nababrata Ghoshal ◽  
Kisor Mukhopadhyay ◽  
Soumen Kumar Roy
Keyword(s):  
Monte Carlo ◽  
Nematic Phase ◽  
Monte Carlo Study ◽  
The Stability ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

scholarly journals High-resolution calorimetric study of a liquid crystalline organo-siloxane tetrapode with a biaxial nematic phase

2008 ◽  
Vol 78 (1) ◽  
Author(s):  
George Cordoyiannis ◽  
Daniela Apreutesei ◽  
Georg H. Mehl ◽  
Christ Glorieux ◽  
Jan Thoen
Keyword(s):  
High Resolution ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Calorimetric Study ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

Thermotropic Biaxial Nematic Phase in Liquid Crystalline Organo-Siloxane Tetrapodes

2004 ◽  
Vol 93 (23) ◽  
Author(s):  
K. Merkel ◽  
A. Kocot ◽  
J. K. Vij ◽  
R. Korlacki ◽  
G. H. Mehl ◽  
...  
Keyword(s):  
Nematic Phase ◽  
Liquid Crystalline ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

scholarly journals Photoluminescent Coordination Polymers Based on Group 12 Metals and 1H-Indazole-6-Carboxylic Acid

Inorganics ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 20
Author(s):  
Antonio A. García-Valdivia ◽  
Estitxu Echenique-Errandonea ◽  
Gloria B. Ramírez-Rodríguez ◽  
José M. Delgado-López ◽  
Belén Fernández ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Coordination Polymers ◽  
Density Functional ◽  
Free Ligand ◽  
Emission Spectra ◽  
Point Of View ◽  
Theoretical Point ◽  
Fourier Transformed Infrared Spectroscopy ◽  
3D Network ◽  
The Stability

Two new coordination polymers (CPs) based on Zn(II) and Cd(II) and 1H-indazole-6-carboxylic acid (H2L) of general formulae [Zn(L)(H2O)]n (1) and [Cd2(HL)4]n (2) have been synthesized and fully characterized by elemental analyses, Fourier transformed infrared spectroscopy and single crystal X-ray diffraction. The results indicate that compound 1 possesses double chains in its structure whereas 2 exhibits a 3D network. The intermolecular interactions, including hydrogen bonds, C–H···π and π···π stacking interactions, stabilize both crystal structures. Photoluminescence (PL) properties have shown that compounds 1 and 2 present similar emission spectra compared to the free-ligand. The emission spectra are also studied from the theoretical point of view by means of time-dependent density-functional theory (TD-DFT) calculations to confirm that ligand-centred π-π* electronic transitions govern emission of compound 1 and 2. Finally, the PL properties are also studied in aqueous solution to explore the stability and emission capacity of the compounds.

The biaxial nematic phase of oxadiazole biphenol mesogens

2013 ◽  
Vol 40 (12) ◽  
pp. 1655-1677 ◽  
Author(s):  
Theo J. Dingemans ◽  
Louis A. Madsen ◽  
Oriano Francescangeli ◽  
Francesco Vita ◽  
Demetri J. Photinos ◽  
...  
Keyword(s):  
Nematic Phase ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase
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