scholarly journals Design of Viologen-Based Liquid Crystals Exhibiting Bicontinuous Cubic Phases and Their Redox-Active Behavior

Materials ◽  
2017 ◽  
Vol 10 (11) ◽  
pp. 1243 ◽  
Author(s):  
Tsubasa Kobayashi ◽  
Takahiro Ichikawa
Keyword(s):  
Liquid Crystals ◽  
Active Behavior ◽  
Cubic Phases ◽  
Redox Active ◽  
Bicontinuous Cubic

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.

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 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 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.

scholarly journals Recent Advances in the Use of Transition-Metal Porphyrin and Phthalocyanine Complexes as Electro-Catalyst Materials on Modified Electrodes for Electroanalytical Sensing Applications

Solids ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 212-231
Author(s):  
J. Antonio Cruz-Navarro ◽  
Fabiola Hernández-García ◽  
Luis Humberto Mendoza-Huizar ◽  
Verónica Salazar-Pereda ◽  
J. Ángel Cobos-Murcia ◽  
...  
Keyword(s):  
Transition Metal ◽  
Catalytic Properties ◽  
Modified Electrodes ◽  
Metal Porphyrin ◽  
Water Contaminants ◽  
Active Behavior ◽  
Sensing Applications ◽  
Redox Active ◽  
Innovative Materials ◽  
Solid Electrodes

Metalloporphyrins (MP) and metallophtalocyanines (MPc) are innovative materials with catalytic properties that have attracted attention for their application for diverse electrochemical purposes. The presence of metallic centers in their structure offers a redox-active behavior that is being applied in the design of solid electrodes for the quantification of biomolecules, water contaminants, and pharmaceuticals, among others. Herein, we collect the recent information about porphyrin and phthalocyanine complexes as modifiers of electrodes, and the important aspects of the design, characterization, and application of these electrodes.

scholarly journals Calculations of and Evidence for Chain Packing Stress in Inverse Lyotropic Bicontinuous Cubic Phases

Langmuir ◽  
2007 ◽  
Vol 23 (13) ◽  
pp. 7276-7285 ◽  
Author(s):  
Gemma C. Shearman ◽  
Bee J. Khoo ◽  
Mary-Lynn Motherwell ◽  
Kenneth A. Brakke ◽  
Oscar Ces ◽  
...  
Keyword(s):  
Chain Packing ◽  
Cubic Phases ◽  
Bicontinuous Cubic

scholarly journals Influence of a pH-sensitive polymer on the structure of monoolein cubosomes

Soft Matter ◽  
2017 ◽  
Vol 13 (41) ◽  
pp. 7571-7577 ◽  
Author(s):  
Monika Kluzek ◽  
Arwen I. I. Tyler ◽  
Shiqi Wang ◽  
Rongjun Chen ◽  
Carlos M. Marques ◽  
...  
Keyword(s):  
Ph Sensitive ◽  
Submicron Size ◽  
Cubic Phases ◽  
Bicontinuous Cubic ◽  
Ph Sensitive Polymer

Cubosomes consist in submicron size particles of lipid bicontinuous cubic phases stabilized by surfactant polymers.

Viologen-Based Redox-Active Ionic Liquid Crystals Forming Columnar Phases

2007 ◽  
Vol 9 (21) ◽  
pp. 4271-4274 ◽  
Author(s):  
Kana Tanabe ◽  
Takuma Yasuda ◽  
Masafumi Yoshio ◽  
Takashi Kato
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Redox Active ◽  
Ionic Liquid Crystals
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