Optical-electric properties of poly(amic acid) composite films with a low content of thermotropic liquid crystals

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 56812-56818 ◽  
Author(s):  
Ling Ding ◽  
Yihe Zhang ◽  
Leipeng Liu ◽  
Jianshe Hu ◽  
Fengzhu Lv
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Composite Films ◽  
Amic Acid ◽  
Electric Properties ◽  
Thermotropic Liquid Crystal ◽  
Thermotropic Liquid Crystals

Poly(amic acid) composite films with the thermotropic liquid crystal, 10-cholesteroxy-10-oxocaproic acid (COOA) were developed.

Phase Diagram of Thermotropic Liquid Crystal Including Negative Pressure Region Generated in Metal Berthelot Tube

2011 ◽  
Vol 181-182 ◽  
pp. 22-25
Author(s):  
Kazuki Hiro ◽  
Tadahiro Wada
Keyword(s):  
Phase Diagram ◽  
Phase Transitions ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Crystalline Phase ◽  
Negative Pressure ◽  
Metal Tube ◽  
Thermotropic Liquid Crystal ◽  
Thermotropic Liquid Crystals ◽  
Pressure Region

Phase diagrams including absolute negative pressure regions of thermotropic liquid crystals give useful information on science and technology. A phase diagram was depicted for ca. 40mg of a thermotropic liquid crystal in a pressure vs. temperature (P-T) plane by the Berthelot method using a metal tube. N-I phase transitions occurred even under-10MPa, and a polymorphism of the crystalline phase was observed.

DNA thermotropic liquid crystals controlled by positively charged catanionic bilayer vesicles

2020 ◽  
Vol 56 (24) ◽  
pp. 3484-3487 ◽  
Author(s):  
Huizhong Liu ◽  
Ling Wang ◽  
Yuanyuan Hu ◽  
Ziang Huang ◽  
Ying Sun ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Catanionic Surfactant ◽  
Thermotropic Liquid Crystal ◽  
Thermotropic Liquid Crystals ◽  
Positively Charged

We report DNA thermotropic liquid crystal (TLC) formation by positively charged catanionic surfactant bilayer vesicles.

scholarly journals Liquid Crystals Templating

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 648 ◽  
Author(s):  
Mamatha Nagaraj
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Inorganic Materials ◽  
The Self ◽  
Thermotropic Liquid Crystals ◽  
Versatile Technique ◽  
Crystal Phases ◽  
Nanoscale Features ◽  
Mesoporous Membranes ◽  
Liquid Crystal Templating

Liquid crystal templating is a versatile technique to create novel organic and inorganic materials with nanoscale features. It exploits the self-assembled architectures of liquid crystal phases as scaffolds. This article focuses on some of the key developments in lyotropic and thermotropic liquid crystals templating. The procedures that were employed to create templated structures and the applications of these novel materials in various fields including mesoporous membranes, organic electronics, the synthesis of nanostructured materials and photonics, are described.

scholarly journals Novel Trends in Lyotropic Liquid Crystals

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 604 ◽  
Author(s):  
Ingo Dierking ◽  
Antônio Martins Figueiredo Neto
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Soft Matter ◽  
Anisotropic Materials ◽  
Lyotropic Liquid Crystals ◽  
Electro Optic ◽  
Thermotropic Liquid Crystals ◽  
Active Liquid ◽  
Biological Liquid

We introduce and shortly summarize a variety of more recent aspects of lyotropic liquid crystals (LLCs), which have drawn the attention of the liquid crystal and soft matter community and have recently led to an increasing number of groups studying this fascinating class of materials, alongside their normal activities in thermotopic LCs. The diversity of topics ranges from amphiphilic to inorganic liquid crystals, clays and biological liquid crystals, such as viruses, cellulose or DNA, to strongly anisotropic materials such as nanotubes, nanowires or graphene oxide dispersed in isotropic solvents. We conclude our admittedly somewhat subjective overview with materials exhibiting some fascinating properties, such as chromonics, ferroelectric lyotropics and active liquid crystals and living lyotropics, before we point out some possible and emerging applications of a class of materials that has long been standing in the shadow of the well-known applications of thermotropic liquid crystals, namely displays and electro-optic devices.

Mechanisms Of Liquid Crystal Alignment On Buffed Polyimide Surfaces

1994 ◽  
Vol 345 ◽  
Author(s):  
Hirotsugu Kikuchi ◽  
J. A. Logan ◽  
Do Y. Yoon
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Amic Acid ◽  
Polymer Chains ◽  
Polymer Surfaces ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Liquid Crystal Alignment ◽  
Smectic C ◽  
Crystal Alignment

AbstractThe surfaces of poly(amic acid) and cured polyimide films, subjected to different buffing and cure profiles, have been examined by atomic force microscopy (AFM). The ability of these buffed polymer surfaces to align nematic and chiral smectic C liquid crystals were also investigated. These studies show that the presence of microgrooves on buffed polymer surfaces are not necessary for alignment of liquid crystals. Rather, it is concluded that the liquid crystal alignment is mainly caused by the anisotropic intermolecular interactions between liquid crystal molecules and the polymer chains oriented by buffing. For the alignment of smectics, both the degree of order and mechanical properties of polyimide films are found to be important factors.

scholarly journals Length Bidisperse Carbon Nanotubes Dispersions in Thermotropic Liquid Crystals

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
V. Popa-Nita ◽  
S. Buček
Keyword(s):  
Carbon Nanotubes ◽  
Free Energy ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Volume Fraction ◽  
Coupling Term ◽  
Nematic Ordering ◽  
Thermotropic Liquid Crystals ◽  
Phase Ordering

We study nematic liquid crystal driven alignment of carbon nanotubes dispersed in them. We extend the mesoscopic model presented in (P. Van der Schoot et al. 2008, V. Popa-Nita, and S. Kralj 2010) including the effect of length bidispersity of carbon nanotubes. The free energy of the mixture is written as the sum of the Doi free energy for lyotropic nematic ordering of the two carbon nanotubes types, the Landau-de Gennes free energy for the thermotropic ordering of liquid crystal, and the coupling term between liquid crystal molecules and carbon nanotubes. The phase ordering of the mixtures is analyzed as a function of volume fraction, the strength of coupling, and the temperature.

Sign in / Sign up

Export Citation Format

Share Document