Synthesis and Application of the Three-Component Lyotropic Liquid Crystal

2015 ◽  
Vol 1095 ◽  
pp. 371-376
Author(s):  
Qiu Li Yang ◽  
Xin Ran Guan ◽  
Xiao Na Xie ◽  
Shao Wei Wei ◽  
Yi Wen Fang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Ternary System ◽  
Optical Microscopy ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Polarized Optical Microscopy ◽  
Texture Structure

This paper focused on synthesizing the surfactant lyotropic liquid crystals (LLCs) through mixing the coconut diethanol amide (6501), primary alcobol ethoxylate (AEO9) and water. The LLCs phases formed in the ternary system are thoroughly investigated by polarized optical microscopy (POM). The obtained LLCs were characterized by XRD and SEM in order to analysis the texture, structure and the transformation. In addition, the LLCs have been applied in the preparation of TiO2nanoparticles in our research. The obtained TiO2powder were characterized by XRD and SEM, more importantly, the results showed that the LLCs are effective in the process of synthesizing TiO2nanoparticles.

Fabrication and Characterizes of TiO2 Nanomaterials Templated by Lyotropic Liquid Crystal

2011 ◽  
Vol 399-401 ◽  
pp. 532-537
Author(s):  
Li Hua Liu ◽  
Ying Bai ◽  
Fu Min Wang ◽  
Ning Liu
Keyword(s):  
Aqueous Solution ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nonionic Surfactant ◽  
Formation Mechanism ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Micro Structure ◽  
Ft Ir ◽  
Rod Structures

TiO2 nanomaterials were synthesized in lyotropic liquid crystal formed by nonionic surfactant TritonX-100 and TiOSO4 aqueous solution with NH3•H2O as precipitator. The lyotropic liquid crystals were characterized by means of POM and Low-angle XRD. FT-IR, TGA, XRD, TEM were used to characterize the TiO2 samples. It was found that all the lytropic liquid crystal were in lamellar liquid crysal phase and after casting the micro-structure of the LLC phase, the TiO2 samples were self-assemble to form lamellar, sphere and rod structures. According to the characterization results, possible formation mechanism was proposed.

A pirfenidone loaded spray dressing based on lyotropic liquid crystals for deep partial thickness burn treatment: healing promotion and scar prophylaxis

2020 ◽  
Vol 8 (13) ◽  
pp. 2573-2588 ◽  
Author(s):  
Jintian Chen ◽  
Hui Wang ◽  
Liling Mei ◽  
Bei Wang ◽  
Ying Huang ◽  
...  
Keyword(s):  
Wound Healing ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Burn Treatment ◽  
Partial Thickness ◽  
Partial Thickness Burn

This study develops a HA combined lyotropic liquid crystal based spray dressing loaded with pirfenidone for wound healing and scar prophylaxis.

Laser Diffractions in Lyotropic Liquid Crystal Formed by Liquid Dishiwash

2010 ◽  
Vol 663-665 ◽  
pp. 779-782
Author(s):  
Yuan Ming Huang ◽  
Wei Wei Liu
Keyword(s):  
Liquid Crystal ◽  
Optical Microscopy ◽  
Red Light ◽  
Lamellar Phase ◽  
Lyotropic Liquid Crystal ◽  
Isotropic Phase ◽  
Polarized Optical Microscopy ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon

We demonstrated that a lamellar phase of lyotropic liquid crystal formed by liquid dishwash could assemble themselves into crystal droplets when their isotropic phase was slowly changed into lamellar phase on the glass substrate. Characterization by means of polarized optical microscopy showed that a pattern of liquid crystal droplets was developed in the thin films formed by liquid dishwash. Our laser light diffraction experiments confirmed that these liquid crystal droplets could effectively diffract the incident red light from a helium-neon laser. On the basis of the Fraunhofer diffraction equation, we derived for the diameter of liquid crystal droplets. The diameter of liquid crystal droplet is 42.517 m, and almost agreement with the graph of polarized optical microscopy.

Synthesis and Mesomorphic Properties of a Series of Cholesteric Liquid Crystals

2010 ◽  
Vol 663-665 ◽  
pp. 759-762 ◽  
Author(s):  
Qing Lan Ma ◽  
Yuan Ming Huang
Keyword(s):  
Phase Transition ◽  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Microscopy ◽  
Scanning Calorimetry ◽  
Polarized Optical Microscopy ◽  
Phase Transition Temperatures ◽  
Second Category ◽  
Mesomorphic Properties

A series of cholesterol liquid crystal compounds was synthesized. Phase-transition temperatures and mesomorphic textures of these synthesized compounds were characterized with differential scanning calorimetry and polarized optical microscopy, respectively. In these molecules the terminal ester chains CnH2n-1COO-, where n was the number of carbon atoms in the terminal ester chains, were linked to the cholesterol core. All of the synthesized cholesterol compounds exhibited mesophases for the first heating. However, as temperature decreased from their clearing points, their micrographs can also be divided into two categories, the first category exhibits branch-like mesophase textures for n in the range of 1-10 while the second category exhibits branch-like crystal textures for n in the range of 11-18.

Location of Phase Boundaries of Lyotropic Liquid Crystal Employing Positron Lifetime Spectroscopy and Electrical Conductivity Measurement

2012 ◽  
Vol 733 ◽  
pp. 127-131
Author(s):  
Ramesh Yadav ◽  
K. Chandramani Singh ◽  
S.R. Choudhary ◽  
P.C. Jain
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Conductivity Measurement ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Ammonium Bromide ◽  
Phase Boundaries ◽  
New Findings ◽  
Positron Lifetime Spectroscopy ◽  
Surfactant Systems

Different compositions of surfactant systems give rise to a rich variety of structures of aggregates. At higher concentrations of surfactant in water, the surfactant molecules aggregate to form lyotropic liquid crystals [1]. In the present work we have prepared two surfactant systems consisting of (i) 20% of cetyl-trimethyl-ammonium-bromide (CTAB) in water, and (ii) 30% of tetra-decyl-trimethyl-ammonium-bromide (TTAB) in water. Both the systems exhibit various lyotropic liquid crystal structures when an increasing amount of co-surfactant is added as third component [2, 3]. These liquid crystalline structures are very sensitive to the solution conditions such as co-surfactant concentration, temperature, ionic strength, counter ion polarizability etc. In this study, positron life time spectroscopy and conductivity measurement have been employed to locate various phases exhibited by the lyotropic liquid crystals. In addition to delineating various phase boundaries of the systems, positron annihilation technique has also yielded new findings.

Temperature dependence of the pitch in chiral lyotropic chromonic liquid crystals

Soft Matter ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Timothy Ogolla ◽  
Robert S. Paley ◽  
Peter J. Collings
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Temperature Dependence ◽  
Optical Microscopy ◽  
Helical Axis ◽  
Coexistence Region ◽  
Polarized Optical Microscopy ◽  
Chiral Nematic ◽  
Microscopy Image ◽  
Optical Microscopy Image

Polarized optical microscopy image of a fingerprint texture for a lyotropic chromonic liquid crystal entering the chiral nematic–isotropic coexistence region. The helical axis is in the plane of the image and the perpendicular distance between the stripes is around 50 μm, half the chiral nematic pitch.

Initiator-dependent kinetics of lyotropic liquid crystal-templated thermal polymerization

2021 ◽  
Vol 12 (15) ◽  
pp. 2236-2252
Author(s):  
Younes Saadat ◽  
Kyungtae Kim ◽  
Reza Foudazi
Keyword(s):  
Mechanical Properties ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Thermal Polymerization ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Kinetics Of

In this study, we show that how the locus of initiation can change kinetics and mechanical properties of polymerized lyotropic liquid crystals.

scholarly journals New cholesteryl containing bent core liquid crystals

2013 ◽  
Vol 78 (5) ◽  
pp. 669-680 ◽  
Author(s):  
Cosmin-Constantin Huzum ◽  
Irina Carlescu ◽  
Gabriela Lisa ◽  
Dan Scutaru
Keyword(s):  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Microscopy ◽  
Liquid Crystalline ◽  
Benzoic Acids ◽  
Scanning Calorimetry ◽  
Polarized Optical Microscopy ◽  
Acyl Chlorides ◽  
Esterification Reactions

The paper presents the synthesis and mesomorphic behavior of two new series of bent core liquid crystalline compounds based on a 1,3-dihydroxybezene core and containing a cholesteryl 6-oxyhexanoate wing. The two series were obtained by the esterification of the cholesteryl 6-(3-hydroxyphenoxy)hexanoate core with some 4-((4-(n-alkyloxy)phenyl)azo)benzoic acids (n-alkyl = n-hexyl ? n-dodecyl) or 4-(4-(n-alkyloxy)benzoyloxy)benzoic acids (n-alkyl = n-hexyl ? n-decyl). The esterification reactions were performed via the corresponding acyl chlorides or with the DCC / DMAP system. All the synthesized compounds evidenced enantiotropic liquid crystalline properties, with smectic type textures, when investigated by means of differential scanning calorimetry and polarized optical microscopy. Isotropisation and isotropic to liquid crystal transitions were relatively low (between 89 ? 1460C). The compounds containing the azo-aromatic linking group presented the largest range of stability of the mesophases (between 42 and 870C). All the investigated compounds were thermally stable in the existence range of the mesophases.

scholarly journals Preparation of Lyotropic Liquid Crystals and Optical Characterisation

2016 ◽  
Vol 64 ◽  
pp. 171-177 ◽  
Author(s):  
Hiromasa Goto
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Microscopy ◽  
Chemical Structure ◽  
Halogen Atom ◽  
Layer Structure ◽  
Smectic Phase ◽  
Lyotropic Liquid Crystals ◽  
Pyridinium Chloride

Synthesis of an ionic liquid crystal (1-(6-(4-(4-trans-pentyl-cyclohexyl)-phenoxy)-hexyl)pyridinium chloride) showing lyotropic smectic phase was carried out. A simple reaction between phenylcyclohexane-type liquid crystal having halogen atom in the terminal and pyridine allows production of the ionic liquid crystal. The NMR measurements confirm chemical structure of the compound. Observation with polarsing optical microscopy evaluated that the compound shows fine multi-domains having fluidity. The lyotropic LC thus prepared displays smectic phase with layer structure.

A chiral–racemic lyotropic chromonic liquid crystal system

Soft Matter ◽  
2021 ◽  
Author(s):  
Jordan K. Ando ◽  
Peter J. Collings
Keyword(s):  
Liquid Crystal ◽  
Optical Microscopy ◽  
Orientational Order ◽  
Molecular Assemblies ◽  
Polarized Optical Microscopy ◽  
Crystal System ◽  
System P ◽  
Liquid Crystal System

A lyotropic chromonic liquid crystal consists of oriented molecular assemblies in solution. If the molecules are chiral, the helical pattern of orientational order is revealed by the stripes seen with polarized optical microscopy.

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