排序方式: 共有30条查询结果,搜索用时 328 毫秒
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钪-乳酸-2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚-Triton-X-100体系的显色反应及应用研究 总被引:1,自引:0,他引:1
在pH8.1~8.8,有 Triton X-100存在下,Sc(Ⅱ)与乳酸(L)及 5-Br-PADAP(R)形成胶束混配络合物。该络合物最大吸收波长为565nm,表观摩尔吸光系数为6.08×10~4L·mol~(-1)·cm(-1)。络合物组成为Sc:L:R=1:1:2。由于乳酸的存在,显色体系灵敏度和选择性都得到提高。本法用PMBP萃取分离干扰组分后,可测定钨矿及其浸出渣中微量钪,相对标准偏差为1.7%~2.7%。 相似文献
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采用高灵敏度,高分辨率激光磁共振光谱(LMR)方法在6μm谱段测量了自由基分子NH2υ2带的σ谱(△MJ=±1)。重复了前人已测过的谱,结果与之较好符合。并观测到了新谱,在14支激光谱线下共获得约115支塞曼(Zeeman)跃迁谱线,其中在6支激光谱线下新测得的谱线91支。 相似文献
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爆炸成型弹丸贯穿混凝土的实验研究 总被引:4,自引:0,他引:4
介绍几种聚能装药对混凝土层的破坏效果,并对聚能装药的结构设计与破坏效果的相互关系进行了分析与讨论。文中重点对截卵形药型罩、亚半球变壁厚药型罩、双功能药型罩的装药结构、破甲能力及目标结构特性进行了研究。 相似文献
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Microchimica Acta - The surface of attapulgite was cleaned, modified with 3-aminpropyltriethoxysilane, and then covered with silver nanoparticles. The structure and morphology of the modified... 相似文献
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通过醚化反应, 将疏水性试剂异丙基缩水甘油醚(IPGE), 接枝到以羟乙基纤维素为亲水性骨架的主链上, 合成了具有温度响应性的2-羟基-3-异丙氧基丙基羟乙基纤维素(HIPEC), 运用核磁共振(1H NMR、13C NMR、2D HSQC NMR)对HIPEC进行结构表征, 其最低临界溶解温度(LCST)可通过改变疏水侧链的摩尔取代度(MS)和盐浓度来调节. 通过荧光光谱仪、动态光散射(DLS)、共聚焦荧光显微镜(CLSM)研究了HIPEC在水溶液中自组装行为及Nile Red在HIPEC胶束中的增溶行为和温度控制释放行为, 结果表明, HIPEC在溶液中自组装形成胶束, 并且胶束粒径随着温度的升高而增大; 在温度高于LCST时, Nile Red从HIPEC胶束中缓慢释放, 并且可通过改变温度控制Nile Red的释放过程. 相似文献
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Benzhi Liu Xiaobin Hu Yuehua Deng Shaogui Yang Cheng Sun 《Journal of Solid State Electrochemistry》2012,16(3):927-930
A simple potentiostatic method was employed to prepare silver nanoparticles deposited on glassy carbon electrode. The silver
nanoparticles exhibit extraordinary electrocatalytic activities toward the reduction process of chloroacetic acids. The electrochemical
behavior of trichloroacetic acid, dichloroacetic acid, and monochloroacetic acid has been investigated by cyclic voltammetry
at the silver nanoparticles-modified glassy carbon electrode in 0.1 M LiClO4 solution; each compound exhibits a series of reduction peaks which represent sequential dechlorination steps up to acetic
acid. The electrocatalytic dechlorination mechanism for chloroacetic acids was also discussed in this work. 相似文献
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Wang Benzhi Huang Hexiu Huang Meilin Yan Puxuan Isimjan Tayirjan Taylor Yang Xiulin 《中国科学:化学(英文版)》2020,63(6):841-849
Hydrogen is one of the most promising energy carriers to replace fossil fuels and electrolyzing water to produce hydrogen is a very effective method. However, designing highly active and stable non-precious metal hydrogen evolution electrocatalysts that can be used in universal pH is a huge challenge. Here, we have reported a simple strategy to develop a highly active and durable non-precious MoO_2-Ni electrocatalyst for hydrogen evolution reaction(HER) in a wide pH range. The MoO_2-Ni catalyst exhibits a superior electrocatalytic performance with low overpotentials of 46, 69, and 84 mV to reach-10 mA cm~(-2) in 1.0 M KOH, 0.5 M H_2SO_4,and 1.0 M PBS electrolytes, respectively. At the same time, the catalyst also shows outstanding stability over a wide pH range. It is particularly noted that the catalytic performance of MoO_2-Ni in alkaline solution is comparable to the highest performing catalysts reported. The outstanding HER performance is mainly attributed to the collective effect of the rational morphological design, electronic structure engineering, and strong interfacial coupling between MoO_2 and Ni in heterojunctions.This work provides a viable method for the synthesis of inexpensive and efficient HER electrocatalysts for the use in wide pH ranges. 相似文献
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The well dispersed and size-controlled Ag nanoparticles decorated multi-walled carbon nanotubes (MWCNT) were synthesized by a simple chemical plating method. The oxidized MWCNT surfaces could get a more controlled and specific nucleation of Ag nanoparticles. The as-prepared nanocomposites were characterized by transmission electron microscopy, X-ray diffraction and cyclic voltammetry. Randles-Sevcik plot suggested that the reaction of the nanocomposites in alkaline solution was a diffusion-controlled process. The electrocatalytic reduction property toward H2O2 was also studied. 相似文献
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