排序方式: 共有27条查询结果,搜索用时 15 毫秒
1.
Wei SUN Dan Dan WANG Rui Fang GAO Jian SUN Kui JIAO 《中国化学快报》2006,17(12):1589-1591
In recent years the direct electron transfer of redox protein on electrode surface has attracted great attentions1. Different kind of modified electrode and various supporting films for immobilization of proteins had been proposed. But most of them are ba… 相似文献
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在微波辅助下合成、纯化了离子液体溴化1-甲基-3-丁基咪唑[BMIM]Br,测定了产率和纯度,并使用FTIR和1HNMR进行了产物结构表征;以[BMIM]Br为萃取剂对催化裂化和加氢裂化柴油进行超声辅助萃取脱硫,并测定了脱硫率;在反应条件优化、测试方法优化、脱硫选择性等方面设置了多个开放性设计实验。该实验项目融合精细化工和石油化工方向,在促进学生知识体系跨界,全面训练综合实验技能,培养学生解决实际问题能力以及科研能力形成等方面作用明显;实验项目以模块化设置,符合"绿色实验"原则。 相似文献
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以1-丁基-3-甲基咪唑六氟磷酸盐离子液体[BMIM]PF6既作为溶剂又作为支持电介质, 通过恒电流、循环伏安等方法制备聚(3-溴噻吩)(PBrT)膜. 采用红外光谱(FT-IR)和扫描电子显微镜(SEM)对PBrT膜的结构和形貌进行表征, 用热重和差热分析法(TG-DTA)研究聚合膜的热稳定性, 并利用紫外-可见光谱(UV-Vis)、计时电流和计时吸收曲线研究该聚合膜电化学和电致变色的特性. 研究结果表明, 与传统方法比较, 在离子液体[BMIM]PF6中制备的PBrT膜更致密、光滑, 具有良好的氧化还原可逆性和充放电能力, 电活性高, 热稳定性好. 以该方法制备的PBrT膜颜色变化明显, 响应时间快(0.5 s), 同时由于离子液体具有电位窗宽、导电率高、可循环利用等优点, 因此在电化学聚合等方面具有良好的应用前景. 相似文献
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The overall crystallization kinetics and spherulite morphologies of miscible poly(ethylene oxide)(PEO)/1-butyl-3-methylimidazolium hexafluorophosphate([BMIM][PF_6]) mixtures were studied by differential scanning calorimetry(DSC),polarized optical microscopy(POM) and rheological measurements. The finer crystal structures were further detected by wide angle X-ray diffraction(WAXD) and small angle X-ray scattering(SAXS). Crystallization of PEO is largely suppressed by [BMIM][PF_6] addition especially at higher ionic liquid(IL) concentrations above 20 wt%. Both the overall crystallization rate and the spherulite growth decrease with the increase of IL content and crystallization temperature; however, the crystallization mechanism keeps unchanged as evidenced by the similar Avrami exponent n and WAXD results. The addition of [BMIM][PF_6] could induce more nuclei to some extent, but the induction time of crystallization is evidently prolonged,and a linear to non-linear transition of the spherulite growth(R ∝ t to R ∝ t~(1/2)) can be observed. At higher IL concentration,the spherulite texture changes apparently from particular serrated to branch surface due to the diffusion-controlled growth and the dilution effect, which also as a main factor contributes to the increasing trend of the long period of crystals. 相似文献
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Density and viscosity were determined for the binary mixtures containing the ionic liquid 1-butyl-3-methylimidazolium thiocyanate
([BMIM][SCN]) and 1-alcohols (1-butanol, 1-pentanol and 1-hexanol) at six temperatures (298.15, 308.15, 318.15, 328.15, 338.15
and 348.15) K and ambient pressure. The density and viscosity correlation for these systems was tested by an empirical second-order
polynomial and by the Vogel-Fucher-Tammann equation in wide ranges of temperatures. Excess molar volumes were described by
the Redlich-Kister polynomial expansions. The density and viscosity variations with composition were described by polynomials.
A qualitative analysis of the trend of the properties with solvent and temperature was performed. The obtained results indicate
that ionic liquid interactions with 1-alcohols are strongly dependent on the special trend of packing of this ionic liquid
into hydroxylic solvents. As previously observed, an increase of the 1-alcohol carbon-chain length leads to lower interactions
on mixing.
Electronic Supplementary Material The online version of this article () contains supplementary material, which is available to authorized users. 相似文献
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Liquid phase microextraction applications in food analysis 总被引:2,自引:0,他引:2
Asensio-Ramos M Ravelo-Pérez LM González-Curbelo MÁ Hernández-Borges J 《Journal of chromatography. A》2011,1218(42):7415-7437
Over the last years, liquid-phase microextraction (LPME) in its different application modes (single drop microextraction, dispersive liquid-liquid microextraction and hollow fiber-LPME) has been increasingly applied for the extraction of both inorganic and organic analytes from different matrices. Its advantages over conventional extraction procedures (simplicity, effectiveness, rapidity and low consumption of organic solvents) has also attracted its application in the complex food analysis field, in which it has clearly provided good and challenging results. A comprehensive review dealing with those articles published since its introduction till the end of March 2011 is presented, offering also a critical vision of the analytical potential of LPME for the analysis of foods. 相似文献
7.
Zehra Durmus Hüseyin Kavas Abdulhadi Baykal Muhammet S. Toprak 《Central European Journal of Chemistry》2009,7(3):555-559
A novel environmental friendly, room temperature route using an ionic liquid 1-n-butyl-3-methylimidazolium hydroxide ([BMIM]OH)
for the synthesis of Mn3O4 nanoparticles is presented. The product was characterized using Fourier transform infrared spectroscopy, X-ray powder diffraction,
and transmission electron microscopy. Phase purity was confirmed by XRD, and X-ray line profile fitting determined a crystallite
size of 42 ± 11 nm. TEM analysis revealed various morphologies. EPR measurements have indicated the existence of long-range
interactions, due to the wide range of particle sizes and morphologies observed.
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