scholarly journals pH dependent isotropic to nematic phase transitions in graphene oxide dispersions reveal droplet liquid crystalline phases

2014 ◽  
Vol 50 (50) ◽  
pp. 6668-6671 ◽  
Author(s):  
Rachel Tkacz ◽  
Rudolf Oldenbourg ◽  
Shalin B. Mehta ◽  
Morteza Miansari ◽  
Amitabh Verma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phase Transitions ◽  
Crystalline Phase ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Ph Dependent ◽  
Droplet Liquid

The existence of a droplet liquid crystalline phase of graphene oxide (GO) is reported.

scholarly journals A 1,6-Diphenylpyrene-Based, Photoluminescent Cyclophane Showing a Nematic Liquid-Crystalline Phase at Room Temperature

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 92 ◽  
Author(s):  
Yoshimitsu Sagara ◽  
Tatsuya Muramatsu ◽  
Nobuyuki Tamaoki
Keyword(s):  
Liquid Crystals ◽  
Crystalline Phase ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Liquid Crystalline Phase ◽  
Condensed State ◽  
Liquid Crystalline Phases ◽  
Potential Applications ◽  
Blue Photoluminescence

Photoluminescent nematic liquid crystals have been an attractive research target for decades, because of their potential applications in optoelectrical devices. Integration of luminescent motifs into cyclic structures is a promising approach to induce low-ordered liquid-crystalline phases, even though relatively large and rigid luminophores are used as emitters. Here, we demonstrate a 1,6-diphenylpyrene-based, unsymmetric cyclophane showing a stable nematic phase at room temperature and exhibiting strong photoluminescence from the condensed state. The observed sky-blue photoluminescence was dominated by the emission species ascribed to assembled luminophores rather than monomers.

Liquid crystalline phase transitions in hexakis(4-(4′-heptyloxy)biphenoxy)cyclotriphosphazene

1995 ◽  
Vol 18 (5) ◽  
pp. 795-800 ◽  
Author(s):  
K. Moriya ◽  
H. Mizusaki ◽  
M. Kato ◽  
S. Yano ◽  
M. Kajiwara
Keyword(s):  
Phase Transitions ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase

Mixed-dimer formation in binary systems of 4-substituted benzoic acids and structure considerations

2008 ◽  
Vol 86 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Maren Roman ◽  
Annett Kaeding-Koppers ◽  
Peter Zugenmaier
Keyword(s):  
Benzoic Acid ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Binary Systems ◽  
Benzoic Acids ◽  
Dimer Formation ◽  
Crystalline Phases ◽  
Cholesteric Phase ◽  
Liquid Crystalline Phases ◽  
Substituted Benzoic Acids

The phase behavior of binary systems of 4-substituted benzoic acids is governed by the formation of mixed dimers. This study was conducted to determine the effect of the components’ structural difference on mixed-dimer formation in crystalline and liquid-crystalline phases. The phase diagrams of two systems, with 4-[(S)-(–)-2-methylbutoxy]benzoic acid (MBOBA) as one component and 4-(hex-5-enoxy)benzoic acid (HOBA) and 4-(dec-9-enoxy)benzoic acid (DOBA), respectively, as the second component, were determined by differential scanning calorimetry, polarized-light microscopy, and X-ray diffraction. The MBOBA-HOBA system exhibited a cholesteric phase, two solid solutions, and above 58 °C for compositions between 40 and 80 mol% HOBA a crystalline phase of mixed dimers. The MBOBA-DOBA system showed a crystalline phase of mixed dimers at all compositions, a cholesteric phase, and a twisted smectic C phase, which was dominated by mixed dimers at 60 and 70 mol% DOBA. We conclude that liquid-crystalline phases are generally dominated by mixed dimers, but in crystalline phases the formation of mixed dimers is promoted by a greater difference in molecular structure. The crystal structure of two of the pure compounds MBOBA and DOBA and comparable compounds have been determined for an evaluation of the arrangements of the molecules in the crystal and liquid-crystalline state.Key words: benzoic acid, crystal arrangement, phase diagrams, liquid crystal.

scholarly journals A Photoaddressable Liquid Crystalline Phase Transition in Graphene Oxide Nanocomposites

2019 ◽  
Vol 29 (24) ◽  
pp. 1900738
Author(s):  
Maria Crespo ◽  
Giovanni Santagiuliana ◽  
Olivier Picot ◽  
Giuseppe Portale ◽  
Emiliano Bilotti ◽  
...  
Keyword(s):  
Phase Transition ◽  
Graphene Oxide ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Crystalline Phase Transition

Terahertz spectroscopy across liquid crystalline phase transitions

2016 ◽  
Vol 108 (5) ◽  
pp. 051908 ◽  
Author(s):  
M. Reuter ◽  
N. Vieweg ◽  
M. Koch ◽  
I. Dierking
Keyword(s):  
Phase Transitions ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Terahertz Spectroscopy ◽  
Liquid Crystalline Phase
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