希土烯丙基化合物的合成——Ⅱ.镥、钆的烯丙基化合物的合成

本文合成了两个新的对空气极敏感的希土烯丙基化合物,由无水希土氯化物与希丙基锂在四氢呋喃—乙醚中反应制得。产物经元素分析、红外光谱等确定其组成为:Li₂Ln(C₃H₅)₅·3Dioxane(Ln=Gd,Lu)。     

Conformation dependence of electronic structures of poly(ethylene oxide)

The electronic structure of pure poly(ethylene oxide) (PEO) for four different polymeric chain conformations has been studied by Hartree-Fock (HF) and density functional theory (DFT) through the analysis of their valence band photoelectron spectroscopy (VB-PES), X-ray emission spectroscopy (XES), and resonant inelastic X-ray scattering (RIXS). It is shown that the valence band of PEO presents specific conformation dependence, which can be used as a fingerprint of the polymeric structures. The calculated spectra have been compared with experimental results for PEO powder.     

Amperometric Glucose Biosensor Based on Platinum Nanoparticles Combined Aligned Carbon Nanotubes Electrode

A sensitive amperometric glucose biosensor based on platinum nanoparticles (PtNPs) combined aligned carbon nanotubes (ACNTs) electrode was investigated. PtNPs which can enhance the electrocatalytic activity of the electrode for electrooxidating hydrogen peroxide by enzymatic reaction were electrocrystallized on 4‐aminobenzene monolayer‐grafted ACNTs electrode by potential‐step method. These PtNPs combined ACNTs' (PtNPs/ACNTs) surfaces were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The highly dispersed PtNPs on ACNTs can be obtained. The enzyme electrode exhibits excellent response performance to glucose with linear range from 1×10^?5–7×10^?3 mol L^?1 and fast response time within 5 s. Furthermore, this glucose biosensor also has good reproducibility. It is demonstrated that the PtNPs/ACNTs electrode with high electrocatalytic activity is a suitable basic electrode for preparing enzyme electrodes.     

Selective oxidation of octadecan-1-ol to octadecanoic acid over Co3O4/SiO2 catalysts

Factors (reaction temperature, reaction time, flow rate of oxygen, amount of catalyst, etc.) influencing the catalytic properties of Co₃O₄/SiO₂catalyst in the oxidation octadecan-1-ol to octadecanoic acid were investigated. The catalysts were characterized by means of XRD, FT-IR and N₂-adsorption. The experimental results indicate that under the optimal condition the selectivity to octadecanoic acid reached 97.5 % over 5 % Co₃O₄/SiO₂ catalyst.This revised version was published online in December 2005 with corrections to the Cover Date.     

Structure and magnetism of Eu2IrD5

A powder neutron diffraction study of Eu¹⁵³₂IrD₅ has shown it to be isostructural with Sr₂IrD₅ at room temperature. Unlike the latter compound, it does not undergo a deuterium-ordering transition at low temperatures. Magnetic scattering at helium temperatures confirms the suggestion that it becomes ferromagnetic below 20 K with a moment corresponding to that of divalent europium.     

毛细管气相色谱法测定果蔬中α—萘乙酸残留量

用530μm大口径毛细管柱为分离柱,GC-FID法测定水果和蔬菜中的α一萘乙酸残留量。方法检测限为10~(-7),回收率和相对标准偏差分别为99.5%和3.0%。     

RADIATION CROSSLINKING OF BRANCHED POLY (VINYL ACETATE)

In the present work, radiation crosslinking of different branched poly (vinyl acetate) have beemstudied and the validity of the relationship between sol fraction and radiation dose: R(S+S~(1/2)=1/U_(1qo)+p′_o/q_oR~βto branched poly(vinyl acetate) have been assured.     

液化石油气水蒸气重整镍催化剂新型载体研究

以共沉淀法合成了硅铝系载体（AS和SA），并采用改性天然高铝石为原料合成了矿物质载体（MC-1和MC-2）,采用浸渍法合成了镍负载型催化剂。用常压固定床管式反应器，考察了液化石油气水蒸气重整反应活性，通过XRD、物理吸附等手段对催化剂进行了表征。结果表明，以MC-1、MC-2和SA、AS为载体的催化剂的水蒸气重整活性明显高于目前普遍使用的Ni/α-Al2O3催化剂。以SA为载体，负载5%镍的催化剂具有最好的水蒸气重整活性。在750 ℃，水碳比为2.0的条件下转化率达100％，C1选择性达94.46％。XRD分析结果表明1 300 ℃焙烧后的SA载体中存在α-Al2O3晶型和莫来石结构。硅、铝添加次序对水蒸气重整活性影响较大，硅-铝添加次序的催化剂样品的活性高于铝-硅添加次序的样品，C1选择性提高12.7％。     

己烯在Ru(1010)表面价带电子特性研究

在200 K以下己烯（C6H12）可以在Ru()表面上以分子状态稳定吸附.偏振角分辨紫外光电子谱（ARUPS）结果表明,己烯分子在垂直于衬底表面并沿衬底表面<>晶向的平面内,己烯分子的轴向沿<>晶向倾斜.随着衬底温度的提高,到200 K以上,己烯分解生成新的碳氢化合物.己烯分解后,πCH分子轨道能级向高结合能方向移动了0.2 eV,同时己烯中C的1s能级向低结合能方向移动了 0.3 eV.