One-pot synthesis of P-toluidine-reduced graphene oxide/Mn3O4 composite and its electrochemical performance

Journal of Solid State Electrochemistry - In this paper, a promising electrode material for supercapacitor based on P-toluidine-reduced graphene oxide/Mn3O4 (GM) composite was successfully...     

Investigation of ultrafast electron dynamics of nickel film and micro-nano-structure film

The electron thermalization and relaxation processes in ferromagnetic nickel thin film and micro-nano- structure film have been studied by measuring the transient change after excitation by a femtosecond laser pulse. The measurements indicate that the electron thermalization time is between 18 and 47 fs. This is somewhat faster than the value reported before. And the thermalization time of the micro-nano-structure film is much longer than the nickel film. We deduce that it is caused by the discontinuity of the electron band close to the Fermi level in the micro-nano-structure nickel film.     

G Protein-coupled Receptor (GPCR) Reconstitution and Labeling for Solution Nuclear Magnetic Resonance (NMR) Studies of the Structural Basis of Transmembrane Signaling

G protein-coupled receptors (GPCRs) are a large membrane protein family found in higher organisms, including the human body. GPCRs mediate cellular responses to diverse extracellular stimuli and thus control key physiological functions, which makes them important targets for drug design. Signaling by GPCRs is related to the structure and dynamics of these proteins, which are modulated by extrinsic ligands as well as by intracellular binding partners such as G proteins and arrestins. Here, we review some basics of using nuclear magnetic resonance (NMR) spectroscopy in solution for the characterization of GPCR conformations and intermolecular interactions that relate to transmembrane signaling.     

一种高智能化的通用自动胶片判读仪

自动通用胶片判读仪是一种高智能化的精密光学测试设备,采用了计算机控制飞点扫描技术、精密光学测量技术、图象跟踪测量与信息处理技术。飞点管分辨率达4096×4096象元,通过光学系统胶片上获得6.55μm高分辨率,飞点扫描方式灵活多样且可随意控制,通用于目前我国靶场所有的电影经纬仪和高速摄影机35mm胶片的数据判读。具有自动判读和半自动判读两种工作模式,自动判读的速度为5帧/秒,自动判读的精度为σ=±0.011mm,半自动判读的精度为σ=±0.009mm,测量数据可以记录、打印和显示。     

Method for preparing a novel type of Pt–carbon fiber disk ultramicroelectrode

A novel and facile method has been developed for the fabrication of Pt–carbon fiber (Pt/CF) disk ultramicroelectrode (DUME). This method, which might be a simple and economical shortcut to get access to Pt/CF DUME, is based upon having metal Pt electroplated on CF DUME. In this paper, an electrode prepared through the new way was characterized by cyclic voltammetry and applied as probe for scanning electrochemical microscope.     

Synthesis and Biological Evaluation of New 4‐Deacety‐1,7,9‐trideoxy‐10‐oxopaclitaxel via Sinenxan A

A new 4‐deacety‐1,7,9‐trideoxy‐10‐oxopaclitaxel (compound 1) was prepared in 21 steps via sinenxan A, a biosynthetic taxane. The biological evaluation in vitro against human cancer lines showed compound 1 to be devoid of cytotoxicity.     

表面有机金属化学(Ⅱ)

简要总结和评述了硅胶表面负载的一些过渡金属氢化物的烷烃碳-碳键和碳-氢键活化、金属铑和铂表面负载的有机锡物种的选择加氢和脱氢及有机金属化合物的沸石分子筛内外表面改性方面的研究进展,指出了今后拟重点研究的一些问题。     

Synthesis and self-assembly of side-chain azocomplex for preparation of solid and hollow nanosphere

A new strategy based on ionic self-assembly technology was provided for design of solid and hollow nanospheres. Solid azocomplex nanospheres were constructed by ionic self-assembly of statistical ionomer and metanil yellow. The structure of azocomplex and self-assembly behaviors were examined by a variety of techniques including ¹H-NMR, ¹³C-NMR, DSC, FTIR, UV–vis, TEM, and elemental analysis. The azocomplex was subjected to solvent-induced self-assembly to construct a variety of morphologies. Solid polymeric nanospheres with the sizes of 50~100?nm in diameter were formed in aqueous solution. High-resolution transmission electron microscopes and X-ray energy dispersion spectrometer were used to study the morphology and composition of the solid nanospheres. The spherical and ordered structure was destroyed in DMF, and converted into membrane structure. Polymeric hollow nanospheres with azobenzene chromophores were formed in DMF/H₂O mixed solvent, with 62.5% H₂O in mass. The size of these hollow nanospheres was 50~120?nm in diameter.     

Enhanced electrochemical performance of unique morphological LiMnPO4/C cathode material prepared by solvothermal method

The LiMnPO₄/C composite material with ordered olivine structure was synthesized in 1:1(v/v) enthanol–water mixed solvent in the presence of cetyltrimethylammonium bromide (CTAB) at 240 ^°C. Rod-like particle morphology of the resulting LiMnPO₄/C powder with a uniform particle dimension of 150 × 600 nm was observed by using scanning electron microscope and the amount of carbon coated on the particle surface was evaluated as 2.2wt% by thermogravimetric analysis, which is reported for the first time to date for LiMnPO₄/C composite. The measurement of the electrochemical performance of the material used in rechargeable lithium ion battery shows that the LiMnPO₄/C sample delivers an initial discharge capacity of 126.5 mA h g^?1 at a constant current of 0.01 C, which is 74% of the theoretical value of 170 mA h g^?1. The electrode shows good rated discharge capability and high electrochemical reversibility when compared with the reported results, which is verified further by the evaluation of the Li ion diffusion coefficient of 5.056×10^?14 cm²/s in LiMnPO₄/C.