Effect of the Functional Groups of Racemic Rodlike Schiff Base Mesogens on the Stabilization of Blue Phase in Binary Mixture Systems
| Autor: | We-Hao Chou, Yu-Chang Huang, Zong-Ye Wu, I-Jui Hsu, Jey-Jau Lee, Bo-Hao Chen, Lai-Chin Wu, Chiung-Cheng Huang, Mei-Ching Yu, Bing-Han Sie |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Schiff base Dopant Stereochemistry Mesogen 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Crystallography chemistry.chemical_compound chemistry Liquid crystal Phase (matter) Materials Chemistry Texture (crystalline) Physical and Theoretical Chemistry 0210 nano-technology Alkyl |
| Zdroj: | The Journal of Physical Chemistry B. 120:12736-12754 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/acs.jpcb.6b09823 |
| Popis: | Four series of rodlike racemic Schiff base mesogens possessing different alkyl chains and two types of linkages, ester and alkynyl linkages, were synthesized and applied to induce cubic blue phases (BPs) in simple binary mixture systems. The mesophases of these Schiff base mesogens were confirmed by variable-temperature X-ray diffraction and the characteristic texture from polarized optical microscopy (POM). In general, when chiral additive S-(+)-2-octyl 4-(4-hexyloxybenzoyloxy)benzoate (S811; 20–40 wt %) is added into the rodlike racemic salicylaldimine-based mesogens, the cubic BPs could be observed and its temperature range is larger than 20 K. The widest temperature range of the cubic BP (35 K) can be observed in the blending mixture composed of rodlike racemic salicylaldimine-based mesogen OH-TIn possessing alkynyl linkage and 35–40 wt % S811. However, Schiff base mesogens possessing alkynyl linkage show a direct isotropic to chiral nematic transition when equal amount of chiral dopant is added. Nota... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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