On the Area Neutral Surface of Inverse Bicontinuous Cubic Phases of Lyotropic Liquid Crystals

Langmuir ◽  
1995 ◽  
Vol 11 (1) ◽  
pp. 334-340 ◽  
Author(s):  
R. H. Templer
Keyword(s):  
Liquid Crystals ◽  
Lyotropic Liquid Crystals ◽  
Neutral Surface ◽  
Cubic Phases ◽  
Bicontinuous Cubic

scholarly journals Competition brings out the best: modelling the frustration between curvature energy and chain stretching energy of lyotropic liquid crystals in bicontinuous cubic phases

2017 ◽  
Vol 7 (4) ◽  
pp. 20160114 ◽  
Author(s):  
Hao Chen ◽  
Chenyu Jin
Keyword(s):  
Liquid Crystals ◽  
Mean Curvature ◽  
Lyotropic Liquid Crystals ◽  
Surface Evolver ◽  
Cubic Phases ◽  
Phase Sequence ◽  
Curvature Energy ◽  
Length Constant ◽  
Bicontinuous Cubic ◽  
Parallel Surfaces

It is commonly considered that the frustration between the curvature energy and the chain stretching energy plays an important role in the formation of lyotropic liquid crystals in bicontinuous cubic phases. Theoretic and numeric calculations were performed for two extreme cases: parallel surfaces eliminate the variance of the chain length; constant mean curvature surfaces eliminate the variance of the mean curvature. We have implemented a model with Brakke's Surface Evolver which allows a competition between the two variances. The result shows a compromise of the two limiting geometries. With data from real systems, we are able to recover the gyroid–diamond–primitive phase sequence which was observed in experiments.

scholarly journals Design of Ionic Liquid Crystals Forming Normal-Type Bicontinuous Cubic Phases with a 3D Continuous Ion Conductive Pathway

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 309 ◽  
Author(s):  
Takahiro Ichikawa ◽  
Yui Sasaki ◽  
Tsubasa Kobayashi ◽  
Hikaru Oshiro ◽  
Ayaka Ono ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Conductivity ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Normal Type ◽  
Ion Conduction ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Chain Lengths

We have prepared a series of pyridinium-based gemini amphiphiles. They exhibit thermotropic liquid–crystalline behavior depending on their alkyl chain lengths and anion species. By adjusting the alkyl chain lengths and selecting suitable anions, we have obtained an ionic amphiphile that exhibits a normal-type bicontinuous cubic phase from 38 °C to 12 °C on cooling from an isotropic phase. In the bicontinuous cubic liquid–crystalline assembly, the pyridinium-based ionic parts align along a gyroid minimal surface forming a 3D continuous ionic domain while their ionophobic alkyl chains form 3D branched nanochannel networks. This ionic compound can form homogeneous mixtures with a lithium salt and the resultant mixtures keep the ability to form normal-type bicontinuous cubic phases. Ion conduction measurements have been performed for the mixtures on cooling. It has been revealed that the formation of the 3D branched ionophobic nanochannels does not disturb the ion conduction behavior in the ionic domain while it results in the conversion of the state of the mixtures from fluidic liquids to quasi-solids, namely highly viscous liquid crystals. Although the ionic conductivity of the mixtures is in the order of 10–7 S cm–1 at 40 °C, which is far lower than the values for practical use, the present material design has a potential to pave the way for developing advanced solid electrolytes consisting of two task-specific nanosegregated domains: One is an ionic liquid nano-domain with a 3D continuity for high ionic conductivity and the other is ionophobic nanochannel network domains for high mechanical strength.

Phase behaviours of a cationic surfactant in deep eutectic solvents: from micelles to lyotropic liquid crystals

2018 ◽  
Vol 20 (17) ◽  
pp. 12175-12181 ◽  
Author(s):  
Qintang Li ◽  
Jiao Wang ◽  
Nana Lei ◽  
Minhao Yan ◽  
Xiao Chen ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cationic Surfactant ◽  
Deep Eutectic Solvents ◽  
Lyotropic Liquid Crystals ◽  
Lamellar Phases ◽  
Bicontinuous Cubic

Various aggregates, including micelles and the hexagonal, bicontinuous cubic and lamellar phases, are formed in deep eutectic solvents.

scholarly journals Supramolecular Metallomesogens:  Hydrogen-Bonded Ferrocene-Containing Liquid Crystals Which Display Bicontinuous Cubic Phases

2005 ◽  
Vol 17 (8) ◽  
pp. 1946-1951 ◽  
Author(s):  
Philippe Massiot ◽  
Marianne Impéror-Clerc ◽  
Michèle Veber ◽  
Robert Deschenaux
Keyword(s):  
Liquid Crystals ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Hydrogen Bonded

scholarly journals Diffusionless transformation of soft cubic superstructure from amorphous to simple cubic and body-centered cubic phases

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jie Liu ◽  
Wenzhe Liu ◽  
Bo Guan ◽  
Bo Wang ◽  
Lei Shi ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
X Ray Diffraction ◽  
Photonic Materials ◽  
Simple Cubic ◽  
Cubic Phases ◽  
Transmission Electron ◽  
Phase Liquid ◽  
Blue Phase ◽  
Blue Phases ◽  
Temperature Window

AbstractIn a narrow temperature window in going from the isotropic to highly chiral orders, cholesteric liquid crystals exhibit so-called blue phases, consisting of different morphologies of long, space-filling double twisted cylinders. Those of cubic spatial symmetry have attracted considerable attention in recent years as templates for soft photonic materials. The latter often requires the creation of monodomains of predefined orientation and size, but their engineering is complicated by a lack of comprehensive understanding of how blue phases nucleate and transform into each other at a submicrometer length scale. In this work, we accomplish this by intercepting nucleation processes at intermediate stages with fast cross-linking of a stabilizing polymer matrix. We reveal using transmission electron microscopy, synchrotron small-angle X-ray diffraction, and angle-resolved microspectroscopy that the grid of double-twisted cylinders undergoes highly coordinated, diffusionless transformations. In light of our findings, the implementation of several applications is discussed, such as temperature-switchable QR codes, micro-area lasing, and fabrication of blue phase liquid crystals with large domain sizes.

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