Methods for chemical analysis of tungsten ores and molybdenum ores . determination of germanium content . distillation separation - phenyl fluorone cetyltrimethyl - ammonium bromide phtometric method 钨矿石钼矿石化学分析方法蒸馏分离,溴化十六烷基三甲胺-苯芴酮光度法测定锗量
Methods for chemical analysis of copper ores lead ores and zinc ores . determination of germanium content . phenylfluorone - cetyltrimethyl ammonium bromide photometric method after carbon tetrachloride extraction 铜矿石铅矿石和锌矿石化学分析方法四氯化碳萃取分离,溴化十六烷基三甲胺-苯芴酮光度法测定锗量
After interfacial polymerization , the module was filled with a 10 % ( wt . % ) aqueous trimethylamine solution and kept for 24 hours to convert the chloromethylated groups into cationic quaternary ammonium groups 当界面聚合反应完成后，将膜浸入浓度为10的三甲胺溶液郑州大学硕士学位论文中，通过化学修饰将其氯甲基基团转化成阳离子季胺盐基团。
It is well known that wo3 is a conductance - type semiconductor gas sensing material , but the research on fish freshness detector with wo3 - based gas sensor to trimethylamine is still at a beginning stage . in this project , the wo3 - based gas sensors to trimethylamine are made , and their gas sensing performance are researched , especially at low temperature , the results are as follows : 1 . the nano - sized wo3 powder is prepared by sol - gel method of sodium tungstate and hydrochloric acid , and its microstructure is analyzed by using xrd , sem and tem , for material ’ s microstructure is closely related to gas sensing performance 本课题制备了wo3材料,并以它为基材,制作了三甲胺气敏传感器,研究了其对三甲胺的气敏性能,尤其是低工作温度下的气敏性能,得到结果如下: 1 、本课题以钨酸钠和浓盐酸为反应物,用溶胶凝胶法制备了纳米wo3材料,并采用x射线衍射分析仪( xrd ) ,扫描电镜( sem ) ,透射电镜( tem )对该材料进行结构分析和形貌观察,研究发现材料的微观结构与气敏性能紧密相关。
Two kinds of wo3 powder are prepared by sol - gel method and gas - phase reaction method with tungsten filament , and heater type gas sensors to trimethylamine are made . under different work temperatures , these sensors ’ sensitivities are measured , and the result indicates that wo3 by sol - gel has better gas sensing performance to trimethylamine . at the same time , the wo3 - based gas sensor to trimethylamine can work at low temperature , which 3 、本课题对不同掺杂的wo3材料进行了研究,发现掺杂3 % pd的wo3基气敏元件在150ppm三甲胺气体中,最佳工作温度仅为85 ,该温度下元件最高灵敏度可达11 . 7 ,并且元件的灵敏度随tma浓度的升高而变大,这表明掺杂pd的wo3材料在低温下对tma气体有很好的响应。
