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由于尿素、过渡金属盐以及它们的配合物在溶剂 (如水、乙醇等 )中的溶解度都较大 ,因此 ,液相法合成配合物的分离提纯往往较困难 ,产率也较低。本文采用尿素与Fe(Ⅲ )盐在室温 (2 5℃ )下直接固相反应 ,几乎定量生成了尿素Fe(Ⅲ )配合物。所用试剂均为分析纯。C、H、N的含量由PerkinElmer 2 40C型元素分析仪测定 ,红外光谱用Nicolet 1 70SXFT IR光谱仪测试 ,KBr压片。熔点用X4 型显微熔点仪测定 ,温度计未经校正。准确称取 2 1 81 6g(3 6mmol)尿素和 1 62 1 8g(6mmol)FeCl3·6H2 O(… 相似文献
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采用了一种全新的化学仿生方法——载体支撑液膜法制备ZnS纳米球链. 常温常压条件下, 利用含邻菲罗啉载体的支撑液膜(SLM)反应体系选择性传输Zn2+至膜另一侧, 在SLM模板作用下, 控制结晶位点, 定向结合阴离子, 加上局部过饱和及界面成核的影响, 成功制备出由8~30 nm纳米粒子自组装的直径范围为250~300 nm ZnS球链. 由XRD和TEM的结果显示, 其结构为立方闪锌矿, 晶格常数为α=0.5390 nm. 本文还对其荧光性质及产物形成机理进行了初步探讨. 相似文献
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吡啶在几种金属纳米线阵列上的表面增强喇曼光谱 总被引:2,自引:0,他引:2
近20多年来利用表面增强喇曼光谱(SERS)的研究还仅限于Ag,Au,Cu这三种具有强SERS效应的金属,最近,田中群等利用合适的表面处理方法和共焦曼光谱技术成功地获得了许多无机离子和有机小分子吸附在一系列的过渡金属(如Pt,Ni,Fe,Pd,Rh,Co,Ru等)上的SERS光谱,拓宽了SERS的应用范围,但这些表面处理方法对基底进行处理时存在着较大的随机性,从而导致对所得SERS信号的解释困难。近年来通过自组装膜、模板合成等技术可得比较有序具有强SERS效应的或表面,例如Nie等最近发现尺寸分布狭窄的Ag溶胶粒子(约80-100nm)能诱导出巨大的SERS增强;Freeman和C tffumj m jf rbutb uqf At A 体微粒组装在聚合物基底上,制得高活性的SERS基底,以上工作都表明制备有序纳米级金属颗粒表面将推动SERS的应用和机理研究,迄今,3半导体纳米线阵列上的喇曼光谱已有报道,而利用金属纳米线阵列作为SERS基底除半于样模合成法制备的Ag纳米线阵列上的SERS之外,尚未见其它相关报道,本文主要研究样模合成法制备金属纳米线的过程,并以此为基底研究吡啶吸附的SERS光谱。 相似文献
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The glucose oxidase (GOD) immobilized onto the surface of activated carbon powders at the glassy carbon electrode (GOD-C/GC) could undergo the quasi-reversible, direct electrochemical reaction. Its formal redox potential, E0′, is almost independent on the scan rates. The average value of E0′ is (-0.467 ± 0.002) V (vs SCE) in the pH 6.8 phosphate buffer solution. Its apparent heterogeneous electron transfer rate constant (ks) is (1.18 ± 0.59) s-1, which is much higher than that reported previously. The dependence of E0′ on the pH of the buffer solution indicated that the direct electrochemical reaction of the immobilized GOD is a two-electron transfer reaction process coupled with two-proton transfer. The further experimental results demonstrated that the immobilized GOD retained its bioelectrocatalytic activity to the oxidation of β-D(+) glucose. 相似文献
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Sheet-like calcite array and stable vaterite were synthesized by bio-mimetic supported liquid membrane system under different reaction conditions. Both of the FTIR spectra of products showed narrower peak at 1418 cm^-1 than that of bulk CaCO3, and that of vaterite has a split in this peak. 相似文献
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