镍氢电池正极大电流充放电性能及最佳配方

采用化学共沉淀法制备了镍铝和钴铝2种层状氢氧化物[ Ni4Al(OH)10]OH和[Co4Al(OH)10]NO3.将前者作为电极活性材料,后者及石墨作为正极导电添加剂,通过单纯形重心设计研究了正极中3种物质的最佳配比,使其大电流充放电性能得到有效地提高.结果表明,电极的性能与电极配方密切相关.当[ Ni4Al(OH)...     

Development of a simple and stability-indicating RP-HPLC method for determining olanzapine and related impurities generated in the preparative process

A simple and stability-indicating reverse phase high performance liquid chromatographic (RP-HPLC) method was developed and validated for the determination of olanzapine (OLN) and related impurities in bulk drugs. Eight impurities were characterized respectively, and particularly a new process impurity from OLN synthesis was structurally confirmed as 1-(5-methylthionphen-2-yl)-1H-benzimidazol-2(3H)-one (Imp-7) by X-ray single crystal diffraction, MS, (1)H NMR, (13)C NMR and HSQC. A mechanism of formation pathway for Imp-7 was proposed. Optimum separation for OLN and eight related impurities was carried out on an Agilent Octyldecyl silica column (TC-C(18), 4.6 mm × 250 mm, 5 μm) using a gradient HPLC method. The method was validated with respect to specificity, linearity, accuracy, precision, LOD and LOQ. Regression analysis showed good correlation (r(2) > 0.9985) between the investigated component concentrations and their peak areas within the test ranges for OLN and eight impurities. The repeatability and intermediate precision, expressed as RSD, were less than 1.74%. The proposed stability-indicating method was suitable for routine quality control and drug analysis of OLN in bulk drugs.     

Immobilization of MP-11 into a mesoporous metal-organic framework, MP-11@mesoMOF: a new platform for enzymatic catalysis

Microperoxidase-11 has for the first time been successfully immobilized into a mesoporous metal-organic framework (MOF) consisting of nanoscopic cages and it demonstrates superior enzymatic catalysis performances compared to its mesoporous silica counterpart.     

Ionic liquid-functionalized graphene as modifier for electrochemical and electrocatalytic improvement: comparison of different carbon electrodes

Electrochemical activities of typically electrochemical targets at three kinds of modified carbon electrodes, i.e. carbon ionic liquid electrode (CILE), graphene/carbon paste electrode (CPE), and ionic liquid-functionalized graphene (IL-graphene)/CPE, were compared in detail. The redox processes of the probes at IL-graphene/CPE were faster than those at CILE and graphene/CPE from cyclic voltammetry. An electrochemical method for the simultaneous determination of guanine and adenine was described with detection limits of 6.5 × 10⁻⁸ mol L⁻¹ (guanine) and 3.2 × 10⁻⁸ mol L⁻¹ (adenine). Single A → G mutation of sequence-specific DNA could be discriminated by the IL-graphene/CPE.     

A novel chemosensor-bipyridyl end capped hyperbranched conjugated polymer

A novel hyperbranched conjugated chemosensor with bipyridyl groups as periphery groups（BPY-HPV） was synthesized.BPY-HPV was highly sensitive to metal ions(Cu²⁺,Ni²⁺) for the strong coordination interaction(K_sv at the order of 10⁷ mol^-1 L) monitored by fluorescence spectroscopy.Moreover,by hydrogen bonds and charge transfer interaction,BPY-HPV shows strong interaction with 1,1,2,2-tetrachloroethane whatever in CH₂Cl₂(K_sv～10⁶ mol^-1 L) or film.     

A novel way to synthesize Pb nanotapes in liquid ammonia

Lead nanotapes were synthesized in liquid ammonia solvent in the presence of sodium metal at low temperature.The process was template free.Transmission electron microscopy(TEM) observations and X-ray diffraction(XRD) characterizations revealed that the as-prepared Pb nanotapes have average diameters in the range of 40-50 nm.and lengths up to several hundred nanometers, and exhibit cubic crystal structures.     

Synthesis,Characterization and Photochromic Properties of Novel Naphthopyrans with Hydrazone Unit Residue

A series of naphthopyrans with hydrazone unit ( 8a – 8m ), were synthesized and characterized by ¹H NMR, ¹³C NMR, IR and HRMS. The photochromic properties were investigated under continuous irradiation, in particular regard to the fatigue resistance and the lifetime of the colored open form in solution and polymers. The results showed that these compounds had both good photochromic properties and high fatigue resistance. Detailed studies showed that representative compound 8d (3,3‐di‐4‐methoxybenzoic acid methylenehydrazino‐[3H]‐naphtho [2,1‐b]pyran) had good photochromic properties in THF solution, in solid state, and in polymers, and exhibited a significant bathochromic shift in the spectra of the open forms compared to known naphthopyrans 9 (3,3‐diphenyl‐[3H]‐naphtho[2,1‐b]pyran). On the other hand, the higher melting points of target compounds are promising for the polymer film preparation through hot‐melt method.     

Synthesis and application of chiral N, N'-dialkylated cyclohexanedi- amine for asymmetric hydrogenation of aryl ketones

Chiral N, N'-dialkylated cyclohexanediamine derived ligands have been synthesized and used in the asymmetric hydrogenation of aryl ketones. Optically active alcohols with up to 90% enantiomeric excess were obtained in high yields.     

生物样本中的甲基苯丙胺和氯胺酮含量的检测研究及其体内分布初探

建立了生物样本中甲基苯丙胺和氯胺酮的定量检验方法,该方法应用固相萃取与工作曲线气相色谱法(GC/NPD)对中毒者血、尿、胃内容、肝、脑等检材进行含量测定.通过实际案件,验证了该法具有样品处理简单、提取效率高、分析速度快等优点.案件数据表明,由口服引起的中毒途径,胃内容的含量最高,其次是尿、肝、脑、血等检材,进一步证实了...     

Preparation of Bi<Subscript>2</Subscript>WO<Subscript>6</Subscript> by Electrospinning: Researching Their Synthesis Mechanism and Photocatalytic Activity

The novel Bi₂WO₆ nanomaterials, which consist of nanosheets and nanoparticles, were successfully synthesized by a combination of electrospinning and calcining processes. The Bi₂WO₆ with different morphologies and microstructures had been obtained in the same experimental conditions. The growth mechanism of such special nanostructures was investigated, and citric acid played an important role in the formation of Bi₂WO₆ nanostructures. The Bi₂WO₆ nanomaterials exhibited excellent photocatalytic property in the photodegradation of the pulping and papermaking wastewater under visible light irradiation. Besides, preparation of the photocatalyst using electrospinning was beneficial for separation and recycling. So, the Bi₂WO₆ nanomaterials have a great potential in application for wastewater treatment in the future.