- Polymer-stabilized bistable dual-frequency cholesteric liquid crystal devices assisted by a predesigned chiral dopant
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Liquid crystals have great potential for developing photonic devices that control the optical behaviors of liquid crystals in smart devices with external stimulation. In this study, we have demonstrated a series of bistable cholesteric liquid crystal devices using the dual-frequency nematic liquid crystal HEF951 assisted by a predesigned chiral ferroelectric liquid crystal. The synthesized chiral ferroelectric liquid crystal was used to induce the formation of the cholesteric liquid crystal phase and decrease the driving voltages and response times of the fabricated bistable liquid crystal devices. The fabricated ferroelectric liquid crystal-assisted bistable cholesteric liquid crystal devices showed a stable opaque focal conic state and stable transparent planar state without any energy consumption once they were turned "from focal-conic to planar"and "from planar to focal-conic". To enhance the reliability, the fabricated bistable cholesteric liquid crystal devices were further stabilized by polymer matrixes. Switching of the bistable liquid crystal cells from one state to another was achieved by a one-step voltage bias with various frequencies. Furthermore, the response time of the sample cell was calculated as 1.7 ms. These results suggest that fabricated ferroelectric liquid crystal-assisted bistable cholesteric liquid crystal devices can be applied to produce energy-saving green liquid crystal displays and other related smart devices.
- Chen, Hung-Yi,Hung, Yi-Hua,Liu, Chun-Yen,Tu, Chia-Min,Wu, Guan-Yi,Yen, Chi-Feng
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supporting information
p. 16672 - 16681
(2021/12/13)
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- Preparation method of butyl (R)-2-(4-hydroxyphenoxy)propionate
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The invention discloses a preparation method of butyl (R)-2-(4-hydroxyphenoxy)propionate. According to the method, an immiscible binary organic solvent system is used, and butyl (R)-2-(4-hydroxyphenoxy)propionate is prepared by an atmospheric pressure rea
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Paragraph 0017; 0018; 0019; 0020; 0021; 0022; 0023-0030
(2019/07/11)
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- Synthesis method of cyhalofopbutyl raw pesticide
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The invention relates to the field of organic synthesis, in particular to a synthesis method of cyhalofopbutyl raw pesticide. The method includes: firstly taking (R)-2-(4-hydroxphenoxyl)propionic acidand n-butyl alcohol as the raw materials to synthesize
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Paragraph 0027-0028; 0030-0031; 0033-0034
(2019/05/08)
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- Cyhalofop butyl synthetic method
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The invention relates to the field of chemical industry, and discloses a cyhalofop butyl synthetic method. The method comprises the following steps: 1) R-2-(4-hydroxyphenoxy)propionic acid and a catalyst are dissolved in an organic solvent to obtain a mixed solution M1; 2) slowly adding an acid binding agent in the solution M1 until no gas is generated to obtain a mixed solution M2; 3) adding bromobutane in the solution M2, reacting the materials to generate an intermediate R-2-(4-hydroxyphenoxy)butyl propionate at the temperature of 85-95 DEG C; and 4) keeping the temperature in the step 3), and adding 3,4-difluorobenzonitrile and reacting to generate the target product cyhalofop butyl. Compared with the prior art, a whole process is completed in a same reaction container, only steps (3) and (4) in the reaction keep the temperature at 85-95 DEG C, The subsequent raw materials can be directly added, the process is simple, the operation is easy, the reaction rate is high, the synthesis efficiency is high, and the yield is high.
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Paragraph 0018-0027
(2017/10/26)
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- Resolution of (R, S)-ethyl-2-(4-hydroxyphenoxy) propanoate using lyophilized mycelium of Aspergillus oryzae WZ007
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The mycelium of Aspergillus oryzae WZ007 was successfully developed to kinetic resolution of (R, S)-ethyl-2-(4-hydroxyphenoxy) propanoate ((R, S)-EHPP) for production of (R)-ethyl-2-(4-hydroxyphenoxy) propanoate ((R)-EHPP). The key biocatalytic process parameters (pH, temperature, rotation speed and substrate concentration) were optimized. Under the optimum conditions, the optical purity of (R)-EHPP was improved up to >99% when the conversion was above 49%. A. oryzae WZ007 whole-cell lipase exhibited high reaction capacity, enantioselectivity and good reusability. The tolerable substrate concentration was 0.5 mol/L, and dry mycelium of A. oryzae WZ007 maintains over 80% of its initial activity after eight repeating cycles. Therefore the enzymatic preparation of (R)-EHPP route was suitable for industrial application.
- Zheng, Jian-Yong,Wu, Jia-Yu,Zhang, Yin-Jun,Wang, Zhao
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- Effects of nitro substituents on the properties of a ferroelectric liquid crystalline side chain polysiloxane
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The syntheses of chiral liquid crystalline side chain polysiloxanes with lateral nitro substituents in the mesogenic core are described. The influence of the substituents and substituent positions on phase behaviour and electro-optical properties are investigated and compared. The lateral nitro groups strongly affect the phase behaviour of the side chain precursors as well as the liquid crystalline polymers. Properties in smectic A and C* phases are discussed with respect to substituent position. One side chain precursor exhibits very large spontaneous polarization of ～700 nC cm-2.
- Svensson, Magnus,Helgee, Bertil,Skarp, Kent,Andersson, Gunnar
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p. 353 - 362
(2007/10/03)
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- Long-range chiral induction in chemical systems with helical organization. Promesogenic monomers in the formation of poly(isocyanide)s and in the organization of liquid crystals
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The preparation of optically active poly(isocyanide)s derived from chiral promesogenic monomers is reported. Remarkably, the stereogenic carbon atom in the monomer is able to pass its chiral 'information' to the growing polymer backbone which is at least
- Amabilino, David B.,Ramos, Elena,Serrano, José-Luis,Sierra, Teresa,Veciana, Jaume
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p. 9126 - 9134
(2007/10/03)
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