Sensors: An Optical Sensor for Volatile Amines Based on an Inkjet-Printed, Hydrogen-Bonded, Cholesteric Liquid Crystalline Film (Advanced Optical Materials 5/2014)

2014 ◽  
Vol 2 (5) ◽  
pp. 403-403
Author(s):  
Jelle E. Stumpel ◽  
Claudia Wouters ◽  
Nicole Herzer ◽  
Judith Ziegler ◽  
Dirk J. Broer ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Optical Materials ◽  
Liquid Crystalline ◽  
Crystalline Film ◽  
Cholesteric Liquid Crystalline ◽  
Volatile Amines ◽  
Hydrogen Bonded

An Optical Sensor for Volatile Amines Based on an Inkjet-Printed, Hydrogen-Bonded, Cholesteric Liquid Crystalline Film

2014 ◽  
Vol 2 (5) ◽  
pp. 459-464 ◽  
Author(s):  
Jelle E. Stumpel ◽  
Claudia Wouters ◽  
Nicole Herzer ◽  
Judith Ziegler ◽  
Dirk J. Broer ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Liquid Crystalline ◽  
Crystalline Film ◽  
Cholesteric Liquid Crystalline ◽  
Volatile Amines ◽  
Hydrogen Bonded

Cholesteric liquid crystal glass platinum acetylides

2014 ◽  
Vol 1698 ◽  
Author(s):  
Thomas M. Cooper ◽  
Aaron R. Burke ◽  
Douglas M. Krein ◽  
Ronald F. Ziolo ◽  
Eduardo Arias ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Materials ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Cholesteric Liquid Crystal ◽  
Isotropic Phase ◽  
Crystal Glass ◽  
Cholesteric Phase ◽  
Long Time ◽  
Cholesteric Liquid Crystalline

ABSTRACTTo prepare cholesteric liquid crystalline nonlinear optical materials with ability to be vitrified on cooling and form long time stability cholesteric glasses at room temperature, a series of platinum acetylide complexes modified with cholesterol has been synthesized. The materials synthesized have the formula trans-Pt(PR3)(cholesterol (3 or 4)-ethynyl benzoate)(1-ethynyl-4-X-benzene), where R = Et, Bu or Oct and X = H, F, OCH3 and CN. A cholesteric liquid crystal phase was observed in the complexes R = Et, and X = F, OCH3 and CN but not in any of the other complexes. When X = CN, a cholesteric glass was observed at room temperature which remained stable up to 130 °C, then converted to a mixed crystalline/cholesteric phase and completely melted to an isotropic phase at 230 °C. When X = F or OCH3 the complexes were crystalline at room temperature with conversion to the cholesteric phase upon heating to 190 and 230 °C, respectively. In the series X = CN, OCH3 and F, the cholesteric pitch was determined to be 1.7, 3.4 and 9.0 µ, respectively.

Side-Chain Cholesteric Liquid Crystalline Elastomers Derived from a Mesogenic Cross-Linking Agent

2003 ◽  
Vol 36 (24) ◽  
pp. 9060-9066 ◽  
Author(s):  
Jian-She Hu ◽  
Bao-Yan Zhang ◽  
Ying-Gang Jia ◽  
Song Chen
Keyword(s):  
Liquid Crystalline ◽  
Side Chain ◽  
Cross Linking ◽  
Cholesteric Liquid Crystalline

Highly regioselective surface acetylation of cellulose and shaped cellulose constructs in the gas-phase

2021 ◽  
Author(s):  
Tetyana Koso ◽  
Marco Beaumont ◽  
Blaise Tardy ◽  
Daniel Rico del Cerro ◽  
Samuel Eyley ◽  
...  
Keyword(s):  
Gas Phase ◽  
Liquid Crystalline ◽  
Computational Modelling ◽  
Building Blocks ◽  
Cellulosic Materials ◽  
Gas Phase Chemistry ◽  
Liquid Crystalline Phases ◽  
Phase Chemistry ◽  
Cholesteric Liquid Crystalline ◽  
Surface Acetylation

Gas-phase acylation of cellulose is an attractive method for modifying the surface properties of cellulosics. However, little is known concerning the regioselectivity of the chemistry, in terms of which cellulose positions are preferentially acylated and if acylation can be restricted to the surface, preserving crystallinities/morphologies. Consequently, we reexplore simple gas-phase acetylation of modern-day cellulosic building blocks – cellulose nanocrystals, pulps, regenerated fibre and aerogels. The gas-phase acetylation is shown to be highly regioselective for the C6-OH, is further supported with computational modelling. This contrasts with liquid-state acetylation, highlighting that the gas-phase chemistry is much more controllable, yet with similar kinetics to the uncatalyzed liquid-phase reactions. Furthermore, this method preserves both the native crystalline structure of cellulose and the supramolecular morphologies of even delicate cellulosic constructs (aerogel exhibiting retention of chiral cholesteric liquid crystalline phases). Therefore, we are convinced that this methodology will lead to more rapid adoption of precisely tailored and cellulosic materials

Controlled Fabrication and Photonic Structure of Cholesteric Liquid Crystalline Shells

2014 ◽  
Vol 26 (29) ◽  
pp. 4919-4919 ◽  
Author(s):  
Yoshiaki Uchida ◽  
Yoichi Takanishi ◽  
Jun Yamamoto
Keyword(s):  
Liquid Crystalline ◽  
Photonic Structure ◽  
Cholesteric Liquid Crystalline
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