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铜离子催化DPKA关环反应及其潜在应用(CuⅡ-induced Ring-formation Reaction of Di-pyridylketone Azine and Its Potential Application)
二吡啶酮肼合物 离子识别 荧光 铜离子
2010/8/18
铜离子催化的氧化关环有机反应,用于选择性荧光探测金属铜离子的存在。晶体结构和光谱分析表明,在DPKA的乙腈/水混合溶剂中,引入铜离子可以促使苯并三氮唑类荧光化合物(2)的形成,该反应可以使得溶液的荧光明显增强。而且在滴定溶液里,引入Cu2+螯合剂EDTA,并不能使得溶液的荧光减弱,表明荧光是由有机物2发射的。同时,其他金属离子的引入并不能产生荧光,而且干扰离子的存在也不能使得荧光光谱发生显著改变,...
介孔空心球状WC微球结构与晶相形成机理(Structure and Crystal Phase Formation Mechanisms of Hollow Global Tungsten Carbide (WC) Microsphere with Mesoporosity)
介孔 空心球状 碳化钨 微球 形成机理
2010/8/18
采用喷雾干燥微球化处理-气固反应法制备了介孔空心球状WC微球,应用扫描电子显微镜(SEM)对微球的形貌变化进行了表征。结果表明,介孔空心球状结构是逐步形成的。其中,空心球状结构形成于前驱体微球化处理过程中,介孔结构形成于空心微球还原碳化过程中。在与样品制备工艺条件相同的情况下,采用原位X射线衍射技术(in situ XRD)对样品的晶相演变规律进行了监测。结果表明,样品在CO/CO2气氛中进行还...
The direct combination of hydrogen and oxygen to form hydrogen peroxide in liquid media with prepared catalysts was carried out in a slurry reactor at atmospheric pressure and room temperature. An O2/...
ZnVSb基压敏陶瓷中尖晶石相形成机理的研究(Formation Mechanism of Spinel in ZnVSb Based Varistor Ceramic)
ZnVSb 基压敏陶瓷 尖晶石 形成机理
2010/8/24
The formation mechanism of zinc-antimony spinel for V2O5 / Sb2O3 precursor, SbVO4 or Sb2O3 doped ZnVSb based varistor ceramics were studied by means of DSC-TGA and XRD techniques. The results show tha...
Formation of the Monolithic Silica Gel Column with Bimodal Pore Structure
Monolithic silica gel column Phase separation Sol-gel transition Pore structure
2010/4/20
A biporous monolithic silica gel column possessing both micrometer sized through-pores and nanometer sized mesopores located in the silica skeletons was prepared and the high concentration porogen (e....