α-Fe_2O_3-MgO复合氧化物的制备和气敏性能

用化学共沉淀法制备了 α-Fe2 O3-Mg O复合金属氧化物纳米晶微粉 .并对其相组成 ,电导和气敏性能作了研究 .结果表明 ,镁铁摩尔比 n(Mg2 )∶ n(Fe3 ) =1∶ 2、5 0 0℃下热处理 4h可得纯相尖晶石型复合金属氧化物 Mg Fe2 O4;电导测量显示 ,该材料呈 n型半导体导电行为 . 60 0℃下热处理 4h所得纳米晶微粉制作的元件在 2 2 7℃工作温度下对 C2 H5OH有较高灵敏度和良好的选择性 .     

α-Fe_2O_3掺杂对In_2O_3电导和气敏性能的影响

用化学共沉淀法制备了α－Ｆｅ２Ｏ３掺杂的Ｉｎ２Ｏ３纳米晶微粉,研究了α－Ｆｅ２Ｏ３掺杂对Ｉｎ２Ｏ３电导和气敏性能的影响．结果表明,α－Ｆｅ２Ｏ３和 Ｉｎ２Ｏ３间可形成有限固溶体Ｉｎ２－ｘＦｅｘＯ３（０≤ｘ≤０．４０）;Ｆｅ３＋对 Ｉｎ２Ｏ３晶格中Ｉｎ３＋格位的部分取代,大大增强了阴阳离子间的结合力,导致材料中氧空位Ｖｏｘ数骤降、自由电子的浓度变稀和电导下降．ｎ（Ｆｅ３＋）：ｎ（Ｉｎ３＋）＝５：５的共沉淀粉于 ８００℃下灼烧 ４ ｈ所得的 α－Ｆｅ２Ｏ３掺杂Ｉｎ２Ｏ３传感器元件,对 ４５μｍｏｌ·Ｌ－１Ｃ２Ｈ５ＯＨ的灵敏度达５４．０,为相同浓度干扰气体汽油的８倍多．     

Studies on the Interactions between Potassium oxalato-oxodiperoxovanadate and Histidine by NMR and MS

K3[VO(O2)2(C2O4)]2H2O, (abbr. BpV (ox)) pertains to peroxovanadium (abbr. pV) complexes, which have been attracted considerable attention nowadays, since they are inhibitors of tyrosine phosphatase and may be developed into a new kind of drugs for the treatment of diabetes1. According to the evidence on water-biperoxovanadium, the molecular mechanism of insulin-like effects of pV involves in irreversibly oxidizing the catalytic cysteine at the active site of the target enzyme2,3. However…     

Voltammetric Studies of the Interaction of Tris (1,10-phenanthroline) Cobalt (III) with Bovine Serum Albumin

Recently, the studies on the interaction of DNA with small molecules have been attracting much interest1-6. These researches not only gave the important information about thermodynamics and kinetics, but also can prompt the combination between the electrode substances and biomacromolecule with super catalysis and sensor character. It is of great significance in understanding energy conversion and metabolism in live body, biomolecular structure, various physical and chemical characters for e…     

Hybrid Composite of Polyaniline Containing Carbon Nanotube

Among various conducting polymers, polyaniline (PANI) is a unique and promising candidate for practical applications because it is not only highly stable in air and in some solvents, but also exhibits dramatic changes in its electronic structure and physical properties in protoactivate state1,2,3. The carbon nanotubes (CNTs) have been proven to possess exotic properties, such as high mechanical strength, flexibility and electric conductivity. The study of carbon-based nanostructures and ma…     

One-Pot Synthesis of N-Boc-2, 5-bis(trimethylsilyl)pyrrolidine

Since Daly reported the structure of epibatidine and its potent analgesic activity in 19921, study on the synthesis of epibatidine and its derivatives and relationships between the structure and activity of epibatidine has received much attention2. During the course of our research for the synthesis of epibatidine derivatives, N-boc-2, 5-bis(trimethylsilyl)pyrrolidine 4 was used as the key intermediate to construct the skeleton of epibatidine via the 1, 3-dipolar cycloaddition (Scheme 1). Ac…     

Ni-B/TiO_2 Amorphous Catalyst Used in Heavy Arenes of Petrochemicals Hydrogenation

The various distillation of petroleum contains arenes. For environmental protection, the hydrogenation of arenes becomes important. The amorphous alloy is a new class of material with special catalytic properties for reduction arenes1-4. In this paper, we prepared the Ni-B/TiO2 and Ni-B/Al2O3 amorphous catalysts by impregnation and reduction by KBH4 solution. Their catalytic activities for hydrogenation arenes were tested by the hydrogenation of 1,3,5-trimethylbenzene (TMB) in the co…     

The Synthesis of N-Morphine Hapten and Production of Monoclonal Antibody

The drug overdose and addiction is a serious international problem. Therefore developing a rapid, accurate, convenient and cheap method for detecting morphine in urea is useful and necessary, especially for investigation of epidemiology, identification of medical jurisprudence and determination of drug addict etc. There are many compounds that are similar to morphine in chemical structure and tend to have cross-reaction with the anti-morphine antibody. In order to reduce the cross reaction a…     

Effect of Calix[4]pyrrole as Addition Reagent on Anions Separation in Capillary Zone Electrophoresis (CZE)

Calixpyrroles, as new macrocyclic receptors, have gain increasing interest in host-guest chemistry. Pioneering work in this area by Sessler and co-workers have evidenced that calix[4]pyrroles are effective anion binding agents and have used for anion binding, sensing and new anion separation technologies1, 2. In this letter, we report that calix[4]pyrroles A, B and C3,4 (Scheme 1) can serve as additives in CZE for the separa- tion of halide ions. Scheme 1 A B C When analyzing anions with…     

Synthesis of a New β-Mercaptoalcohol

Mercaptoalcohols are a rare class of natural products. Some optically active mercaptoalcohols have been used as catalysts in asymmetric reduction of prochiral Ketone1,2. In this letter, we report the synthesis of a new optically active (-mercaptoalcohols, (R)-1,1-diphenyl-2-mercapto-3-methyl-1-butanol 7, from L- valine.Our first attempt is showed in Scheme 1. According to literature's method L-valine was converted to (S)-2-Hydroxy-3-methylbutanoic acid 21,2. 2 was treated with MeOH/SOCl2…