scholarly journals Control of morphology in synthesizing mesoporous silica

2000 ◽  
Vol 72 (1-2) ◽  
pp. 137-146 ◽  
Author(s):  
Chung-Yuan Mou ◽  
Hong-Ping Lin
Keyword(s):  
Phase Transformation ◽  
Liquid Crystal ◽  
Nitric Acid ◽  
Mesoporous Silica ◽  
Hexagonal Phase ◽  
Silicate Liquid ◽  
Morphological Transformation ◽  
Liquid Crystal System ◽  
Surfactant Composition ◽  
Morphological Transformations

Mesoporous silica can be synthesized by either the alkaline route or the acidic route, both using surfactants as templates. Morphological transformations of mesoporous silica can produce various hierarchical orders. Different morphologies are produced under different synthetic conditions. In the alkaline route, the surfactant/silicate liquid crystal system undergoes phase transformation to form vesicles and further transforms to the hexagonal phase. The results are tubule-within-tubule and hollow pillar-within-sphere structures depending on cosurfactant/surfactant composition. Using nitric acid in the acidic route, one can obtain hierarchical ropes or gyroids depending on stirring conditions. Ammonia hydrothermal treatment can induce further morphological transformation to nanotubes of mesoporous silica.

scholarly journals Mechanisms and Intermediates in the True Liquid Crystal Templating Synthesis of Mesoporous Silica Materials

2021 ◽  
Vol 125 (12) ◽  
pp. 3197-3207
Author(s):  
Johanna R. Bruckner ◽  
Jessica Bauhof ◽  
Jacqueline Gebhardt ◽  
Ann-Katrin Beurer ◽  
Yvonne Traa ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Mesoporous Silica ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Liquid Crystal Templating ◽  
Templating Synthesis

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.

scholarly journals Liquid Crystal Ordering in the Hexagonal Phase of Rod-Coil Diblock Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1262
Author(s):  
Mikhail A. Osipov ◽  
Maxim V. Gorkunov ◽  
Alexander A. Antonov
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Density Functional ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Hexagonal Phase ◽  
Orientational Order ◽  
Order Parameters ◽  
Copolymer Composition ◽  
Rigid Rod

Density functional theory of rod-coil diblock copolymers, developed recently by the authors, has been generalised and used to study the liquid crystal ordering and microphase separation effects in the hexagonal, lamellar and nematic phases. The translational order parameters of rod and coil monomers and the orientational order parameters of rod-like fragments of the copolymer chains have been determined numerically by direct minimization of the free energy. The phase diagram has been derived containing the isotropic, the lamellar and the hexagonal phases which is consistent with typical experimental data. The order parameter profiles as functions of temperature and the copolymer composition have also been determined in different anisotropic phases. Finally, the spatial distributions of the density of rigid rod fragments and of the corresponding orientational order parameter in the hexagonal phase have been calculated.

Clark–Lagerwall effect in the small particles—Ferroelectric liquid crystal system

Optik ◽  
2013 ◽  
Vol 124 (4) ◽  
pp. 343-346 ◽  
Author(s):  
T.D. Ibragimov ◽  
G.M. Bayramov ◽  
A.R. Imamaliev
Keyword(s):  
Liquid Crystal ◽  
Ferroelectric Liquid Crystal ◽  
Small Particles ◽  
Crystal System ◽  
Liquid Crystal System

Martingale solutions to a stochastic smectic-A liquid crystal model with multiplicative noise of jump type

2021 ◽  
pp. 2150046
Author(s):  
Theodore Tachim Medjo ◽  
Caidi Zhao
Keyword(s):  
Liquid Crystal ◽  
Multiplicative Noise ◽  
Galerkin Approximation ◽  
Martingale Solution ◽  
Smectic A ◽  
Liquid Crystal System ◽  
Skorokhod Representation Theorem ◽  
Crystal Model ◽  
2D And 3D ◽  
Martingale Solutions

In this paper, we are interested in proving the existence of a weak martingale solution of the stochastic smectic-A liquid crystal system driven by a pure jump noise in both 2D and 3D bounded domains. We prove the existence of a global weak martingale solution under some non-Lipschitz assumptions on the coefficients. The construction of the solution is based on a Faedo–Galerkin approximation, a compactness method and the Skorokhod representation theorem. In the two-dimensional case, we prove the pathwise uniqueness of the weak solution, which implies the existence of a unique probabilistic strong solution.

Research on stability of liquid crystal system doped with γ-Fe2O3 nanoparticles

2021 ◽  
Author(s):  
Xu Zhang ◽  
Ningning Liu ◽  
Zongyuan Tang ◽  
Yingning Miao ◽  
Xiangshen Meng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fe2o3 Nanoparticles ◽  
Crystal System ◽  
Liquid Crystal System
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