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.

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.

Multifunctional Materials via Molecular Self-Organization into Liquid-Crystalline Phase

2008 ◽  
Vol 47-50 ◽  
pp. 165-168 ◽  
Author(s):  
Suk Wah Tam-Chang ◽  
Delfin Mahinay ◽  
Li Ming Huang
Keyword(s):  
Liquid Crystals ◽  
Organic Compound ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Self Organization ◽  
Local Order ◽  
Self Organized ◽  
Polymer Template ◽  
Micrometer Scale

In this paper, we described the synthesis of N,N’-di-(2-ammoniumethyl)perylene- 3,4,9,10-bis(dicarboximide) ditrifluoroacetate (1), an ionic organic compound that self-organized to give chromonic liquid crystals and anisotropic crystals. Using a polymer template with micrometer-scale features to direct the ordered arrangement of 1, patterned structure with micrometer-scale local order was fabricated. The anisotropic (direction-dependent) properties of the crystals and micropatterns of 1 were investigated.

Dynamics of liquid crystalline phase transition in sedimenting platelet-like particles

Soft Matter ◽  
2018 ◽  
Vol 14 (16) ◽  
pp. 3049-3056 ◽  
Author(s):  
Jize Sui ◽  
Yiming Ding ◽  
Masao Doi
Keyword(s):  
Phase Transition ◽  
Crystalline Phase ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Isotropic Phase ◽  
Closed Container ◽  
Crystalline Phase Transition

When a suspension of platelet-like particles sediment in a closed container, the particles undergo isotropic–nematic phase transition (I–N transition), and there appears a clear interface between the isotropic phase and the nematic phase.

Two-Dimensional Superlattice Self-Formed by Novel Ionic Liquid Crystals and Its Photofunctional Property

1999 ◽  
Vol 559 ◽  
Author(s):  
A. Kanazawa ◽  
T. Ikeda
Keyword(s):  
Liquid Crystals ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Chloride Ions ◽  
Liquid Crystalline Phase ◽  
Two Dimensional ◽  
Phosphonium Salts ◽  
Smectic A ◽  
Transition Behavior ◽  
Smectic A Phase

ABSTRACTThermotropic liquid-crystalline behavior of various complex salts, which are structurally simple amphiphiles without rigid cores, was evaluated by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffractometry. The phosphonium salts, consisting of positive phosphorus and negative chloride ions, were found to show a smectic A phase in which a homeotropic structure was formed spontaneously. It is significant that the phosphonium salts possess an advantageous feature as thermotropic liquid crystals and show a stable liquid-crystalline phase and a simple phase transition behavior in comparison with commonly available ammonium analogs. Furthermore, the introduction of divalent metal ions into the amphiphiles was revealed to result in enhancement of the thermal properties. Although the ammonium chlorides as parent compounds showed no liquid-crystalline phase (or indistinct transition behavior), the ammonium complexes possessing tetrachlorometalate ions exhibited clearly the smectic A phase in the expanded temperature range. Additionally, through the evaluation of dipolar alignment in the solid-state phosphonium assembly by second harmonic generation, it was assumed that the self-assembly can be regarded as layered polar thin films produced by two-dimensional ionic layers with an overall permanent electric polarization.

Tuning liquid crystalline phase behaviour in columnar crown ethers by sulfur substituents

2017 ◽  
Vol 4 (5) ◽  
pp. 790-803 ◽  
Author(s):  
Jochen Kirres ◽  
Katharina Schmitt ◽  
Iris Wurzbach ◽  
Frank Giesselmann ◽  
Sabine Ludwigs ◽  
...  
Keyword(s):  
Crown Ethers ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Phase Behaviour ◽  
Liquid Crystalline Phase ◽  
Side Chains ◽  
Columnar Mesophases ◽  
Sulfur Containing

Sulfur-containing side chains in the periphery ofo-terphenyl or triphenylene units of crown ethers induce room-temperature columnar mesophases.

A Room-Temperature Liquid-Crystalline Phase with Crystalline π Stacks

2007 ◽  
Vol 119 (21) ◽  
pp. 3970-3973 ◽  
Author(s):  
Yijin Xu ◽  
Siwei Leng ◽  
Chenming Xue ◽  
Runkun Sun ◽  
Jie Pan ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Liquid Crystalline Phase ◽  
Temperature Liquid

scholarly journals A fibre forming smectic twist–bent liquid crystalline phase

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11207-11211 ◽  
Author(s):  
M. G. Tamba ◽  
S. M. Salili ◽  
C. Zhang ◽  
A. Jákli ◽  
G. H. Mehl ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystalline Phase ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Filament Formation

We demonstrate the nanostructure and filament formation of a novel liquid crystal phase of a dimeric mesogen below the twist–bend nematic phase.

scholarly journals Special Issue Editorial: Current Advances in Liquid Crystals

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3713
Author(s):  
Pradip K. Bhowmik
Keyword(s):  
Liquid Crystals ◽  
Crystalline Phase ◽  
Liquid Crystalline ◽  
Liquid Crystalline Phase ◽  
Special Issue ◽  
Broad Field

The broad field of liquid crystals (LCs) has attracted the attention of chemists, physicists, biologists and engineers alike since the discovery of liquid crystalline phase by the Austrian botanist Friedrich Reinitzer in 1888 [...]

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