Institute of Chemistry
Changchun Institute of Applied Chemistry, Chinese Academy Of SciencesNot a member yet
23443 research outputs found
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Single-phased white-light-emitting Ca-4(PO4)(2)O:Ce3+,Eu2+ phosphors based on energy transfer
No full textA novel single-composition Ca-4(PO4)(2)O:Ce3+,Eu2+ phosphor emitting white light was synthesized by conventional solid-state reaction for light-emitting diode applications. X-ray diffraction, photoluminescence spectra, and luminescence decay spectra were used to characterize the samples. Energy transfer from Ce3+ to Eu2+ ions was observed in the co-doped samples, and the transfer mechanism in the Ca-4(PO4)(2)O:Ce3+,Eu2+ phosphors was dipole-dipole interaction. The emission hue of Ca-4(PO4)(2)O:Ce3+,Eu2+ was found to vary from blue (0.165, 0.188) to white (0.332, 0.300) and eventually to orange (0.519, 0.366) by precisely controlling the ratio of Ce3+ to Eu2+. The combination of a 380 nm near-ultraviolet chip with a Ca-4(PO4)(2)O:0.02Ce(3+),0.012Eu(2+) phosphor produced a diode emitting white light with ultra-wideband emission and a correlated color temperature of 4124 K. Overall, results indicated that the prepared samples may be potentially applied in white-light-emitting diodes
One-step synthesized immunostimulatory oligonucleotides-functionalized quantum dots for simultaneous enhanced immunogenicity and cell imaging
No full textUnmethylated cytosine phosphate guanine (CpG) dinucleotides, normally occur in natural bacterial and viral genomes, show strong immunostimulatory activities to invading pathogens and have found widespread applications in both basic research and clinical trials. For the first time, we design a simple one-step synthesis of CpG-functionalized quantum dots (QDs), combining fascinating features of enhanced immunogenicity and cell imaging. The induction of QDs can greatly increase CpG uptake ability by TLR9-positive cells and elevate CpG stability against nuclease degradation. What is more, the outstanding optical properties also suggest that the CpG-QDs can serve as promising optical probes for the evaluation of the cellular uptake efficiency of the CpG motifs. To our best knowledge, this is the first report to use a facile one-pot synthesis strategy that allows the CpG-functionalized QDs to be prepared, which are able to serve as both the potent platform for immunotherapy and the fluorescent probes for intracellular imaging. (C) 2014 Elsevier B.V. All rights reserved
Aptamer-based colorimetric biosensing of abrin using catalytic gold nanoparticles
No full textIn this study we propose a simple and sensitive colorimetric aptasensor for the quantitative analysis of abrin by using catalytic AuNPs for the first time. AuNPs possess the peroxidase-like activity that can catalyse 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2, leading to color change of the solution. It is interesting to find that the peroxidase-like activity of AuNPs can be improved by surface activation with a target-specific aptamer. However, with a target molecule, the aptamer is desorbed from the AuNPs surface, resulting in a decrease of the catalytic abilities of AuNPs. The color change of the solution is relevant to the target concentration, and this can be judged by the naked eye and monitored by using a UV-vis spectrometer. The linear range for the current analytical system was from 0.2 nM to 17.5 nM. The corresponding limit of detection (LOD) was 0.05 nM. Some other proteins such as thrombin (Th), glucose oxidase (GOx), and bovine serum albumin (BSA) all had a negligible effect on the determination of abrin. Furthermore, several practical samples spiked with abrin were analyzed using the proposed method with excellent recoveries. This aptamer-based colorimetric biosensor is superior to other conventional methods owing to its simplicity, low cost, and high sensitivity
First preparation of a triterpenoid-based supramolecular hydrogel in physiological phosphate buffered saline
No full textA glycyrrhetinic acid-based (GA, a natural pentacyclic triterpenoid) supramolecular hydrogel was attained in physiological phosphate buffered saline for the first time. Its assembly process and potential applications in drug release were preliminarily explored
High performance of rubrene thin film transistor by weak epitaxy growth method
No full textRubrene single-crystal transistors have achieved one of the highest carrier mobilities in organic semiconductors. However its thin film transistor usually shows inferior performance due to the poor film quality. Therefore how to obtain large-area and high quality rubrene thin film has become a prominent challenge. This work utilized weak epitaxy growth method with new inducing layer 1,3-di( terphenyl) benzene (m-7P), and lager-area highly ordered terrace rubrene film was obtained. Based on this high quality film, the hole mobility of rubrene polycrystalline thin film transistor has been enhanced to 11.6 cm(2) V-1 s(-1) with VOPc as buffer layer between semiconductor layer and electrodes. This high device performance was attributed to the flat inducing layer and the single orientation of rubrene domains on m-7P layer, which may reduce grain boundaries and improve the film quality. This easy process to prepare large-area high performance rubrene device supplies a good opportunity for large-area electronic device manufacture. (C) 2015 Elsevier B.V. All rights reserved
Non-symmetrical aluminium salen complexes: Synthesis and their reactivity with cyclic ester
No full textNon-symmetrical aluminium salen complexes that contained different substituents were designed and synthesized. All the ligands and their complexes were characterized by H-1, C-13 NMR and elemental analysis. These complexes can be used as catalysts to produce polylactide and poly-epsilon-caprolactone. All polymerizations were living and molar mass distributions were narrow. The M-n(obsd) of the isolated polymers were in good agreement with M-n(calcd). The polymerization rate of electrophilic substituted complex was higher than the non-electrophilic substituted analogies. The bulky substituents with more steric hindrance of the complexes had relatively lower activity. Kinetic studies showed that the polymerizations were both first-ordered with respect to lactide and epsilon-caprolactone monomers. (C) 2015 Elsevier Ltd. All rights reserved
铜-铈氧化还原液流电池性能
No full text设计了一种新型Ce-Cu氧化-还原液流电池,研究了Ce3+/Ce4+和Cu0/Cu2+氧化还原电对的循环伏安特性,优化了电解液及电极材料,进而组装出液流电池,测试了电池的充放电性能。结果表明,在45 m A恒电流充/放电条件下,电池放电平台电压约为1.
我国科研机构研究生教育的主要问题及成因探析
No full text科研机构是我国研究生教育体系的重要组成部分。本文总结我国科研机构研究生教育发展的六个阶段,指出现阶段存在的若干突出问题,并从政府、高校和企业等创新主体出发对其成因进行深入分析,同时结合创新型国家建设需要,对科研机构研究生教育的未来发展及人才培养提出一些意见和建议
阻燃型聚乳酸基聚氨酯的合成与表征
No full text以聚乳酸二醇、六次甲基二异氰酸酯和二溴新戊二醇设计合成出一系列阻燃型聚乳酸基聚氨酯。通过核磁、凝胶色谱和红外等表征了材料的结构性能。结果表明,二溴新戊二醇作为扩链剂可满足制备高相对分子质量聚氨酯的要求,材料的热学性能随聚乳酸二醇相对分子质量和硬段质量分数的增加而增加。同时该类聚氨酯具有较好的力学性能,拉伸强度在50 MPa附近,接近工业级别的聚乳酸。材料的阻燃性能随着溴质量分数的增加而增强。当溴质量分数为8.6%,聚氨酯的极限氧指数(LOI)为28,属于难燃级别材料
溶液加工型蒽类树枝状深蓝光材料的合成与表征
No full text采用9,10-二苯蒽（DPA）作为中心核,一代至三代齐聚咔唑作为外围树枝,设计合成了一系列溶液加工型树枝状深蓝光荧光材料Ent1,Ent2和Ent3.不同于DPA容易在膜态下形成结晶,Ent1Ent3均具有良好的热稳定性和形态稳定性,玻璃化转变温度高达194371℃.同时,咔唑树枝的引入,有效地抑制了分子间的相互作用,使得膜态下荧光量子效率从Ent1的46%提高至Ent2的52%和Ent3的67%.通过旋涂工艺制备了深蓝光非掺杂器件,发现第二代树枝状荧光材料Ent2表现出最优器件性能,发光效率为2.6