Luminescence properties of sol-gel derived spherical SiO2@Gd-2(WO4)(3): Eu3+ particles with core-shell structure

Monodisperse, core-shell structured SiO2@Gd-2(WO4)(3):Eu3+ particles were prepared by the sol-gel method. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy, transmission electron microscopy, photoluminescence (PL) and low-voltage cathodoluntinescence (CL). PL and CL study revealed that the core-shell structured SiO2@Gd-2(WO4)(3):Eu3+ particles show strong red emission dominated by the D-5(0)-F-7(2) transition of Eu3+ at 615 nm with a lifetime of 0.89 ins. The PL and CL emission intensity can be tuned by the coating number of Gd-2(WO4)(3):Eu3+ phosphor layers on SiO2 particles, the size of the SiO2 core particles, and by accelerating voltage and the filament current, respectively.

A novel terbium (III) beta-diketonate complex as thin film for optical device application

A novel terbium complex, Tb(acac)(3)AAP (acac: acetylacetone, AAP: 4-amino-antipyrine), was synthesized and its luminescent properties were studied. When it was used as an emitting center, triple-layer-type device with a structure of glass substrate/ITO (indium-tin oxide)/TPD (N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine)./Tb(acac)(3)AAP/PBD (2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole) or Alq(3) (tris(8-hydroxyquinolinato) aluminum)/Al (aluminum) exhibited bright characteristic emission of terbium ion upon applying d.c. voltage. The maximum luminance of the device is 56 cd/m(2) at 19 V and the maximum luminance efficiency is 0.357 lm/W.

原子三角法在定量结构/活性相关分析中的应用

运用原子三角法表征 1 -[(2 -hydroxyethoxy) methyl]-6-(phenylthio) thymine(HEPT)类化合物的三维结构信息 .由原子三角的频数计算得到化合物的相似度矩阵 ,并在此基础上衍生出新的变量 .运用多元回归分析和人工神经网络分别构造了预测数学模型 ,得到了较满意的结果

Sol-gel-derived, polishable, 1 : 12-phosphomolybdic acid-modified ceramic-carbon electrode and its electrocatalytic oxidation of ascorbic acid

Novel ceramic-carbon electrodes (CCEs) containing 1:12-phosphomolybdic acid (PMo12) were constructed by homogeneously dispersing PMo12 and graphite powder into methyltrimethoxysilane-derived gel. Peak currents for the PMo12-doped CCE were surface-controlled at lower scan rates but diffusion-controlled at higher scan rates and peak potentials shifted to the negative potential direction with increasing pH. In addition, the electrode exhibited electrocatalytic activity toward the oxidation of ascorbic acid. The PMo12-modified CCE presented good chemical and mechanical stability and good surface renewability (ten successive polishing resulted in less than 5% relative standard deviation). (C) 2000 Elsevier Science B.V. All rights reserved.

聚氨酯反应体系中的相互作用

采用高分辨核磁共振方法（１ＨＮＭＲ、１３ＣＮＭＲ）研究聚醚聚氨酯脲反应体系中聚醚多元醇（环氧乙烷／四氢呋喃共聚醚（ＰＥＴ）、聚乙二醇（ＰＥＧ））和固化剂Ｎ－１００及催化剂之间的相互作用和络合物形成．结果表明共聚醚的羟基和Ｎ－１００的异氰酸酯基团之间存在相互作用，能形成一种相对稳定的络合物．催化剂二月桂酸二丁基锡（ＤＢＴＤＬ）能与聚醚多元醇中的羟基氧络合，而使羟基质子变得十分活泼．三苯基铋（ＴＰＢ）及其乙氧基取代的衍生物与羟基质子之间存在氢键式络合作用，其作用强度随ＴＰＢ碱性增强而增强，三种乙氧基取代的ＴＰＢ中此类作用依间位＜对位＜邻位的顺序增强.

A cryo-hydrogel immobilized protein electrode for direct electron transfer of myoglobin

The direct electron transfer process of horse heart myoglobin, which was immobilized into a new type of cryo-hydrogel membrane on a glassy carbon electrode surface, was studied and the characteristics of this cryo-hydrogel immobilized protein electrode were discussed.

镧在铸态Al－3Li合金中的分布及对组织结构的影响

Ａｌ－３Ｌｉ合金中加入少量（０．０３～０．５８ｗｔ％）Ｌａ后，ＳＥＭ分析表明，当Ｌａ含量大于０．１ｗｔ％时，Ｌａ主要富集于晶界；金相分析表明：少量Ｌａ对合金晶粒组织影响不明显，而对枝晶组织有明显影响。对枝晶组织的影响程度同合金中Ｌａ含量及冷却速度有关；Ｘ－射线分析表明，合金基体相（α－Ａｌ）的点阵常数α随Ｌａ含量的增加而增大，后又稍减小。

含有机硅三元多嵌段共聚物的研究──Ⅱ．（PSF－PDMS－PHS）_n的动态力学性能研究

以双酚Ａ聚砜（ＰＳＦ）为硬段、聚对羟基苯乙烯（ＰＨＳ）为半硬段、聚二甲基硅氧烷（ＰＤＭＳ）为软段合成了三元多嵌段共聚物，并对其动态力学性能和抗张性能进行了比较详细的研究，结果表明该三元多嵌段共聚物为多相结构；在引入半硬段ＰＨＳ后两相间的界面相增宽，粘接力增大，其强度和模量高且稳定，使含有机硅高分子材料强度低的弱点得以改善。扭辩分析（ＴＢＡ）结果显示，这种三元多嵌段共聚物具有多重转变，且在－２０℃至５０℃间有两个较大的几乎重叠的吸收峰；这表明这种三元多嵌段共聚物的相分离结构较为复杂，并有良好的阻尼性能。

聚甲基丙烯酸甲酯/聚醋酸乙烯酯共混相分离过程的标度行为与逾渗结构

本文用激光光散射和光学显微镜方法研究了聚甲基丙烯酸甲酯/聚醋酸乙烯酯共混体系不稳相分离过程最大散射强度I_m(t,T)和相应波矢q_m(t,T)随时间变化规律及相区的逾渗结构.实验结果表明:I_m(T,t)和q_m(t,T)与时间t满足简单的标度关系I_m(t,T)～t~β,q_m(t,T)～t~(-α),且标度关系β=3α成立.揭示了相态结构的分维特征.给出了计算相态结构分维数的简便方法,其分维数D值约为1.64±0.03.与逾渗模型给出的D值接近.

GENERAL ALPHA-N INDEX AND ITS APPLICATION .2. THE CORRELATION BETWEEN THE GENERAL ALPHA-N INDEX AND PHYSICAL-PROPERTIES OF NEUTRAL PHOSPHORUS-COMPOUNDS

The relationship between the alpha-N index and physical properties of neutral phosphorus extractants is studied. Using the general alpha-N index which could describe extractants with minute difference in structure, the good correlation between it and various physical properties of the neutral phosphorus extractants (e.g., densities, refractive index, shift ratio of paper chromatography and IR frequencies of bond P = O) is obtained. The result indicates that general alpha-N index is a good topological index of organic compounds.

A STUDY ON CH5O+ IONS IN GAS PHASE CID EYPERIMENT AND QUANTUM CHEMISTRY CALCULATION

The structures of CH5O+ from two different reactions which are protonation of CH3OH from the above two pathways possess the same structures, CH3OH2+. The value of kinetic energy release for the metastable decomposition CH2OH3+-> CH2OH+ + H-2 determined from the experiment is in good agreement with that from theoretical calculations. The transition state of above reaction were disscussed.