Mechano-induced photoluminescence colour change in an alkyltolane-terminated cyanostilbene

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mizuho Kondo ◽  
Yuya Morita ◽  
Jun-ichi Nishida ◽  
Kawase Takeshi ◽  
Nobuhiro Kawatsuki
Keyword(s):  
Liquid Crystalline ◽  
Colour Change ◽  
Luminescent Materials ◽  
Solid Structure ◽  
Metastable Structures ◽  
Mechanochromic Luminescence

Luminescent materials with liquid-crystalline properties can form metastable structures and thus exhibit mechanochromic luminescence. Herein, we prepared a novel rod-like alkyltolane-terminated cyanostilbene luminophore, determined its solid structure, and investigated its...

Fluorescent nematic liquid crystalline oligomers with Reversible Texture and Photoluminescence response to Temperature

2021 ◽  
Author(s):  
Congcong Luo ◽  
bing yao ◽  
Hengheng Zhu ◽  
Xi-Hua Du ◽  
Yan Chen ◽  
...  
Keyword(s):  
Information Security ◽  
Liquid Crystalline ◽  
Unique Feature ◽  
External Stimulus ◽  
Luminescent Materials ◽  
Response To Temperature ◽  
Photoluminescence Response

Fluorescent liquid crystalline in luminescent materials have attracted interest for their unique feature of fluorescence in response to external stimulus and their applicability in information security and anti-counterfeiting. Herein, fluorescent...

scholarly journals Introduction to Colloidal and Microfluidic Nematic Microstructures

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 956
Author(s):  
Simon Čopar ◽  
Miha Ravnik ◽  
Slobodan Žumer
Keyword(s):  
Soft Matter ◽  
Liquid Crystalline ◽  
Colloidal Particles ◽  
Topological Defects ◽  
Crystalline Materials ◽  
Inherent Anisotropy ◽  
Metastable Structures ◽  
Liquid Crystalline Materials ◽  
Mesoscopic Theory

In this brief review, we give an introduction to selected colloidal and microfluidic nematic microstructures, as enabled by the inherent anisotropy and microscopic orientational ordering in complex liquid crystalline materials. We give a brief overview of the mesoscopic theory, for equilibrium and dynamics, of nematic fluids, that provides the framework for understanding, characterization, and even prediction of such microstructures, with particular comment also on the role of topology and topological defects. Three types of nematic microstructures are highlighted: stable or metastable structures in nematic colloids based on spherical colloidal particles, stationary nematic microfluidic structures, and ferromagnetic liquid crystal structures based on magnetic colloidal particles. Finally, this paper is in honor of Noel A. Clark, as one of the world pioneers that helped to shape this field of complex and functional soft matter, contributing at different levels to works of various groups worldwide, including ours.

Self-assembly and mechanochromic luminescence switching of trifluoromethyl substituted 1,3,4-oxadiazole derivatives

2016 ◽  
Vol 4 (40) ◽  
pp. 9588-9597 ◽  
Author(s):  
Rahul M. Ongungal ◽  
Aneesh P. Sivadas ◽  
N. S. Saleesh Kumar ◽  
Sajith Menon ◽  
Suresh Das
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Stimuli Responsive ◽  
Oxadiazole Derivatives ◽  
Mechanochromic Luminescence

Stimuli responsive luminescence switching, liquid crystalline and gelation properties of 1,3,4-oxadiazole derivatives were investigated.

Photochromic fluorescence switching in liquid crystalline polynorbornenes with α-cyanostilbene side-chains

2020 ◽  
Vol 8 (19) ◽  
pp. 6461-6469 ◽  
Author(s):  
Yijin Wu ◽  
Shasha Zhang ◽  
Jiwei Pei ◽  
Xiao-Fang Chen
Keyword(s):  
Liquid Crystalline ◽  
Colour Change ◽  
Liquid Crystalline Polymers ◽  
Side Chains ◽  
Crystalline Polymers ◽  
Fluorescence Switching

Photoinduced fluorescence colour change based on Z/E isomerization and [2+2] dimerization in cyanostilbene liquid crystalline polymers.

Field-induced Colour Change of Liquid Crystalline Dyes

1979 ◽  
Vol 14 (7) ◽  
pp. 817-823 ◽  
Author(s):  
G. Pelzl ◽  
H. Schubert ◽  
H. Zaschke ◽  
D. Demus
Keyword(s):  
Liquid Crystalline ◽  
Colour Change

Dual mechanochromism of cellulosic cholesteric liquid-crystalline films: wide-ranging colour control and circular dichroism inversion by mechanical stimulus

2018 ◽  
Vol 6 (6) ◽  
pp. 1370-1376 ◽  
Author(s):  
K. Miyagi ◽  
Y. Teramoto
Keyword(s):  
Circular Dichroism ◽  
Liquid Crystalline ◽  
Colour Change ◽  
Mechanical Stimulus ◽  
Crystalline Films ◽  
Circular Dichroïsm ◽  
Cholesteric Liquid Crystalline

We found that cellulosic liquid-crystalline films displayed not only a wide-ranging colour change but also inversion of circular dichroism upon a mechanical stimulus.

The effect of mechano-stimuli on the amorphous-to-crystalline transition of mechanochromic luminescent materials

CrystEngComm ◽  
2015 ◽  
Vol 17 (3) ◽  
pp. 526-531 ◽  
Author(s):  
Yun Lv ◽  
Yang Liu ◽  
Xin Ye ◽  
Guangfeng Liu ◽  
Xutang Tao
Keyword(s):  
Amorphous Materials ◽  
Luminescent Materials ◽  
Crystalline Materials ◽  
Mechanochromic Luminescence

Mechano-stimuli, which causes mechanochromic luminescence when being applied on crystalline materials, facilitates the annealing crystallization of amorphous materials.

scholarly journals Negative Thermal Quenching of Photoluminescence from Liquid-Crystalline Molecules in Condensed Phases

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1555
Author(s):  
Hussain Sami ◽  
Osama Younis ◽  
Yui Maruoka ◽  
Kenta Yamaguchi ◽  
Kumar Siddhant ◽  
...  
Keyword(s):  
Chain Length ◽  
High Temperatures ◽  
Liquid Crystalline ◽  
Thermal Quenching ◽  
Material Design ◽  
Terminal Group ◽  
Molecular Structures ◽  
Isotropic Phase ◽  
Condensed Phases ◽  
Luminescent Materials

The luminescence of materials in condensed phases is affected by not only their molecular structures but also their aggregated structures. In this study, we designed new liquid-crystalline luminescent materials based on biphenylacetylene with a bulky trimethylsilyl terminal group and a flexible alkoxy chain. The luminescence properties of the prepared materials were evaluated, with a particular focus on the effects of phase transitions, which cause changes in the aggregated structures. The length of the flexible chain had no effect on the luminescence in solution. However, in crystals, the luminescence spectral shape depended on the chain length because varying the chain length altered the crystal structure. Interestingly, negative thermal quenching of the luminescence from these materials was observed in condensed phases, with the isotropic phase obtained at high temperatures exhibiting a considerable increase in luminescence intensity. This thermal enhancement of the luminescence suggests that the less- or nonemissive aggregates formed in crystals are dissociated in the isotropic phase. These findings can contribute toward the development of new material design concepts for useful luminescent materials at high temperatures.

scholarly journals Blue-Shifting Mechanofluorochromic Luminescent Behavior of Polymer Composite Films Using Gelable Mechanoresponsive Compound

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 950
Author(s):  
Mizuho Kondo ◽  
Yuya Morita ◽  
Nobuhiro Kawatsuki
Keyword(s):  
Polymer Composite ◽  
Liquid Crystalline ◽  
Color Change ◽  
Composite Films ◽  
Mechanical Stimuli ◽  
Dioxane Solution ◽  
Composite Surface ◽  
Mechanochromic Luminescence ◽  
Luminescent Behavior ◽  
Luminescence Color

Mechanochromic luminescent dyes change their luminescence color upon exposure to external mechanical stimuli. In this study, we synthesized a liquid crystalline mechanochromic luminescent dye containing a terminal cholesterol molecule. The dissolution of the dye in 1,4-dioxane resulted in the formation of a gel. The luminescence of the xerogel obtained from the dioxane solution changed from green to blue upon grinding, indicating mechanochromic luminescence behavior. The anisotropic patterning of short-wavelength-shifted luminescence color change by directional handwriting on surface layer of liquid crystal was successfully demonstrated. Furthermore, blue-shifting mechanoresponsive polymer composite surface was fabricated by using the luminophore.

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