Photoalignment controls of liquid crystals for photonic materials design

2021 ◽  
Author(s):  
Atsushi Shishido
Keyword(s):  
Liquid Crystals ◽  
Materials Design ◽  
Photonic Materials

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.

Photonic Materials Based on Mixtures of Cholesteric Liquid Crystals with Polymers

2003 ◽  
Vol 107 (29) ◽  
pp. 6961-6964 ◽  
Author(s):  
P. V. Shibaev ◽  
V. I. Kopp ◽  
A. Z. Genack
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Photonic Materials

Dynamic Photonic Materials Based on Liquid Crystals

2013 ◽  
pp. 1-64 ◽  
Author(s):  
Luciano De Sio ◽  
Nelson Tabiryan ◽  
Timothy Bunning ◽  
Brian R. Kimball ◽  
Cesare Umeton
Keyword(s):  
Liquid Crystals ◽  
Photonic Materials

scholarly journals Chiral-nematic liquid crystals as one dimensional photonic materials in optical sensors

2014 ◽  
Vol 2 (33) ◽  
pp. 6695-6705 ◽  
Author(s):  
D. J. Mulder ◽  
A. P. H. J. Schenning ◽  
C. W. M. Bastiaansen
Keyword(s):  
Liquid Crystals ◽  
Optical Sensors ◽  
Nematic Liquid Crystals ◽  
Photonic Materials ◽  
One Dimensional ◽  
Chiral Nematic

Current developments in the field of thermotropic chiral-nematic liquid crystals as sensors are discussed.

Photoinduced Isotropic State of Cholesteric Liquid Crystals: Novel Dynamic Photonic Materials

2007 ◽  
Vol 19 (20) ◽  
pp. 3244-3247 ◽  
Author(s):  
U. A. Hrozhyk ◽  
S. V. Serak ◽  
N. V. Tabiryan ◽  
T. J. Bunning
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Photonic Materials ◽  
Isotropic State

scholarly journals Iridescence in nematics: Photonic liquid crystals of nanoplates in absence of long-range periodicity

2019 ◽  
Vol 116 (37) ◽  
pp. 18322-18327 ◽  
Author(s):  
Minxiang Zeng ◽  
Daniel King ◽  
Dali Huang ◽  
Changwoo Do ◽  
Ling Wang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Broad Spectrum ◽  
Carbon Nanoparticles ◽  
Orientational Order ◽  
Colloidal Dispersion ◽  
Structural Color ◽  
Ordered Structure ◽  
Photonic Structure ◽  
Photonic Materials ◽  
Structural Colors

Photonic materials with positionally ordered structure can interact strongly with light to produce brilliant structural colors. Here, we found that the nonperiodic nematic liquid crystals of nanoplates can also display structural color with only significant orientational order. Owing to the loose stacking of the nematic nanodiscs, such colloidal dispersion is able to reflect a broad-spectrum wavelength, of which the reflection color can be further enhanced by adding carbon nanoparticles to reduce background scattering. Upon the addition of electrolytes, such vivid colors of nematic dispersion can be fine-tuned via electrostatic forces. Furthermore, we took advantage of the fluidity of the nematic structure to create a variety of colorful arts. It was expected that the concept of implanting nematic features in photonic structure of lyotropic nanoparticles may open opportunities for developing advanced photonic materials for display, sensing, and art applications.

The Structure and Development of Microbodies in the Fat Body and other Tissues of an Insect (Calpodes Ethlius)

1970 ◽  
Vol 28 ◽  
pp. 148-149
Author(s):  
M. Locke ◽  
J. T. McMahon
Keyword(s):  
Electron Microscopy ◽  
Liquid Crystals ◽  
Fat Body ◽  
Competitive Inhibitor ◽  
Dense Core ◽  
Urate Oxidase ◽  
Blood Proteins ◽  
Free Base ◽  
The Core ◽  
The Matrix

The fat body of insects has always been compared functionally to the liver of vertebrates. Both synthesize and store glycogen and lipid and are concerned with the formation of blood proteins. The comparison becomes even more apt with the discovery of microbodies and the localization of urate oxidase and catalase in insect fat body.The microbodies are oval to spherical bodies about 1μ across with a depression and dense core on one side. The core is made of coiled tubules together with dense material close to the depressed membrane. The tubules may appear loose or densely packed but always intertwined like liquid crystals, never straight as in solid crystals (Fig. 1). When fat body is reacted with diaminobenzidine free base and H2O2 at pH 9.0 to determine the distribution of catalase, electron microscopy shows the enzyme in the matrix of the microbodies (Fig. 2). The reaction is abolished by 3-amino-1, 2, 4-triazole, a competitive inhibitor of catalase. The fat body is the only tissue which consistantly reacts positively for urate oxidase. The reaction product is sharply localized in granules of about the same size and distribution as the microbodies. The reaction is inhibited by 2, 6, 8-trichloropurine, a competitive inhibitor of urate oxidase.

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