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41.
Guangqing Guo Chaoyi Hui Li Xiaoshu Zhou Ping Xie Rongben Zhang 《Liquid crystals》2002,29(9):1247-1250
A new route for the preparation of liquid crystalline polyorganosiloxanes containing laterally linked mesogenic units on the main chains (LLM-POS) is described. First, a novel polyorganosiloxane containing hydroquinone units on the main chains (HQ-POS) was synthesized by hydrosilylation polymerization. To avoid the oxygen silylation side reaction of phenolic groups, tetrahydropyranyl (THP) protective groups were used on the phenols taking part in the hydrosilylation reaction, the results indicating that THP groups are very stable and effective in hydrosilylation reactions. Then HQ-POS was further modified by a grafting reaction with 4- n -octyloxybenzoyl chloride, giving the desired LLM-POS, which has an increased molecular mass in comparison with similar polymers prepared by commonly used approaches. The titled LLM-POS was characterized by DSC, POM and XRD and shown to give smectic textures. 相似文献
42.
43.
A potassium ion-selective electrode based on a cobalt(II)-hexacyanoferrate(III) (CHCF) film-modified glassy carbon electrode is proposed. The electroactive film is introduced onto the glassy carbon electrode surface by electrodeposition of cobalt, which forms a thin CHCF film on subsequent anodic scanning in KClHCl solution (pH 5.0–5.5) containing K3Fe(CN)6. The thickness of the film on the electrode surface can be controlled by changing the electrodeposition time and the concentrations of cobalt(II) and Fe(CN)3?6 ions. The modified electrode exhibits a linear response in the concentration range 1 × 10?1 ?3 × 10?5 M potassium ion activity, with a near-Nernstian slope (48–54 mV per decade) at 25 ± 1°C. The detection limit is 1 × 10?5 M. The stability, response time and selectivity were investigated. The electrode exhibits good selectivity for potassium ion with the twelve cations investigated. The relative standard deviation is 1.5% (n=10). The effects of the thickness of the electroactive film and the pH of the solution on the electrode response were also investigated. 相似文献
44.
A ligand-free nickel-catalyzed Kumada cross-coupling of aryl bromides and tert-butyl Grignard reagents led to the formation of a series of tert-butyl aryls in moderate to good yields, excellent tBu/iBu ratios, and good functional group compatibility. A radical coupling process is indicated and a mechanism with a Ni(I)-Ni(III) catalytic cycle is proposed. 相似文献
45.
Integrating ferromagnetism (FM) and photoluminescence (PL) into one particular nanostructure as biological probe plays an irreplaceable role in accurate clinical diagnosis combining magnetic resonance and photoluminescence imaging technology. However, magnetic emergence generally needs a spin polarization at Fermi level to display a half-metallic electronic feature, which is not beneficial for preserving radiation recombination ability of photo-excited electron-hole carriers. To overcome this intrinsic difficulty, we propose a feasible atomic-hybridization strategy to anchor carbon quantum dots (CQDs) onto ZnO microsphere surface via breakage of C=O bonds at CQDs and subsequent Zn-3d and C-2p orbital hybridization, which not only ensures the carrier recombination but also leads to a room-temperature magnetism. Herein, the photoluminescence and magnetism coexist in this multifunctional heterojunction with outstanding biocompatibility. This work suggests that integration of magnetism and photoluminescence could be accomplished by particular interfacial orbital hybridization. 相似文献
46.
NHC‐Pd complex based on 1,3‐bis (4‐ethoxycarbonylphenyl) imidazolium chloride: synthesis,structure and catalytic activity in the synthesis of axially chiral benzophenone hydrazone
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Wenzeng Duan Zhaofeng Sun Yanmin Huo Yanke Liu Guangqing Wu Ruifeng Wang Shuang Wu Qingxia Yao Shuwen Gong 《应用有机金属化学》2018,32(9)
A novel NHC–Pd complex of 1,3‐bis (4‐ethoxycarbonylphenyl) imidazolium chloride has been synthesized and characterized by 1H NMR, 13C NMR, IR and X‐ray single‐crystal diffraction studies. TG analysis shows that the NHC‐Pd complex is stable under 208 °C. The catalytic activities have been explored for the synthesis of axially chiral N‐(2′‐methoxy‐1,1′‐binaphthalen‐2‐yl) benzophenone hydrazone. The result indicates that the novel NHC‐Pd complex can achieve better catalytic activity than the Pd‐phosphine catalysts in the synthesis of axially chiral N‐(2′‐methoxy‐1,1′‐binaphthalen‐2‐yl) benzophenone hydrazone. 相似文献
47.
In this paper, a discrete multi-projection method is developed for solving the eigenvalue problem of a compact integral operator with a smooth kernel. We propose a theoretical framework for analysis of the convergence of these methods. The theory is then applied to establish super-convergence results of the corresponding discrete Galerkin method, collocation method and their iterated solutions. Numerical examples are presented to illustrate the theoretical estimates for the error of these methods. 相似文献
48.
Hongbo Lu Jun Zhang Minghui Wang Zhigang Song Xianfeng Xiong Guangqing Lin 《Molecular Crystals and Liquid Crystals》2014,588(1):9-16
The effect of curing frequency on the morphology of polymer networks and the electro-optical property of normal-mode polymer-stabilized cholesteric textures (PSCTs) has been investigated. The scanning electron microscopy indicates that the shape of polymer networks transforms from honeycomb-like to fiber-like due to the increased solubility of the monomer at higher curing frequencies. The PSCTs cured at lower frequencies with sufficiently large network voids show a two-stage reorientation process that correlates with two kinds of cholesteric liquid crystal (LC) under different environments. The threshold voltage decreases as the curing frequency increases from 1 Hz to 10,000 Hz, while the field-off response time increases. 相似文献
49.
Xu Guangqing Feng Qiang Wang Zhiwei Lv Jun Huang Jun Li Yong Zhang Pengjie Wu Yucheng 《Journal of Solid State Electrochemistry》2020,24(2):365-374
Journal of Solid State Electrochemistry - Reduced TiO2 nanotube arrays were obtained by hydrogen-thermal and electrochemical reduction methods respectively, and the photoelectrochemical... 相似文献
50.
通过正己胺引发γ-苯甲基-L-谷氨酸酯-N-内羧酸酐(BLG-NCA)开环聚合制备聚(γ-苯甲基-L-谷氨酸酯)(PBLG), 并进一步脱掉苯甲基保护得到聚(L-谷氨酸)(PLG). 以利福平为模型药物, 通过油包油(O/O)无水乳液法制备了PLG载药微球. 扫描电子显微镜检测表明该载药微球具有良好的球形形貌且粒径分布较均一, 粒径大小约为9.0 μm. 体外释放实验表明该载药微球对利福平的释放具有明显的pH敏感性, 在模拟胃液中较少释放利福平, 而在模拟肠液中较快并大量释放利福平, 符合口服药物载体释放性能的要求, 可用于口服药物的定位肠溶性载体. 此外, 噻唑蓝实验表明该微球具有良好的生物相容性. 相似文献