尖晶石型LiMn2O4薄膜电极的制备及电化学性质研究──电化学石英晶体微天平(EQCM)技术研究

石英晶体微天平(QCM)作为纳克级的质量传感器,可通过测定石英晶体振动频率的变化来测定石英晶体表面微小的质量变化.近年来,电化学石英晶体微天平(EQCM)技术已广泛应用于电化学研究领域[1].在锂嵌入型电极充放电过程中,锂离子在嵌基材料中嵌入脱出会引起电极质量的微小变化,因而利用EQCM技术研究Li+的嵌入脱出过程有其独到之处.     

联吡啶桥联乙酰丙酮铜配合物的晶体结构和波谱研究

研究了联吡啶桥联乙酰丙酮铜配合物[μ-4,4-bipy-Cu(acac)~2]的晶体结构和电子结构,晶体属单斜晶系,空间群P2~1/n,晶胞参数:a=11.288(5), b=14.507(6),c=11.978(3)A;β=94.17`,Z=4.非权重偏离因子R=0.054.结构测定表明:在晶体中Cu(acac)~2与4,4-bipy是以1:1形成一维无限的链状结构.利用UV,IR,ESR等波谱,比较了[μ-4,4-bipy-Cu(acac)~2]和Cu(acac)~2成键情况的差异,近似地计算了分子轨道系数α1,α1'和ε~x.分析了1H NMR谱中接触位移,准接触位移和各向异性效应的存在和相对大小。     

KCuZrSe~3的中温固相合成及晶体结构

用反应性熔盐法在中温(500℃)下合成KCuZrSe~3。该晶体属正交晶系,空间群为Cmcm,Z=4。晶胞参数,a=0.3883(7)nm,b=1.4447(2)nm,c=1.0186(3)nm。V=0.5715(2)nm^3,Dc=5006mg.nm^-^3,Mr=430.74,F(000)=760,μ=25.217mm^-^1,λ(MoKα)=0.07107nm。R[R^2>2σ(F^2)]=0.0471。KCuZrSe~3具有层状结构。[CuZrSe~3]^-为带负电的层,按ABAB方式规程。K^+位于相邻两层之间。Zr^4^+与Se^2^-成八面体配位,Cu^+与Se^2^-为四面体配位,K^+与Se^2^-为四方反棱柱配位。配位多面体都有一定的变形。反应性熔盐法中温合成的这一晶体为热力学稳定相。     

与Seyfert星系NGC3516成协的X射线源的光学光谱证认*——非宇宙学红移的可能证据

为了检验有关类星体红移本质的争论 ,研究了Seyfert星系NGC35 1 6周围的6个X射线源 ,对其中的 5个源进行了光谱观测 .观测结果和已知结果表明S1 1 0 2 +72 46 ,S1 1 0 8+ 72 2 6 ,Q1 1 0 6 + 72 44,Q1 1 0 5 + 72 42 ,Q1 1 0 5 + 72 38和Q1 1 0 7+ 72 32是红移分别为 0 .0 89,0 .32 8,0 .6 90 ,0 .92 9,1 .399和 2 .1 0的活动星系核 .这些活动星系核的一些特殊性质倾向于支持类星体有非宇宙学红移的理论 .     

一维硅纳米线的生长机制及其量子限制效应的研究 *

介绍一维硅纳米线的合成及控制硅纳米线直径的方法、生长机制和不同硅纳米线形态的生成机理以及硅纳米线的量子限制效应 .     

基于小波分析的条纹图滤波方法

本文提出了一种新颖的干涉条纹图非线性滤波方法,可以选择性地在频域图像的不同区域选用不同的滤波方式,在滤掉图像中大部分散斑噪声的同时,能够减少信息的损失,使图像的内部边界仍然保持清晰。文中首先简介了正交小波变换的原理,然后介绍了去除散斑噪声的具体算法,最后给出了计算机模拟去噪声的结果     

用VITA法检测壁湍流喷射事件的归组问题

用子波分析和能量最大准则解决了ＶＩＴＡ法检测壁湍流猝发中的喷射事件的归组问题     

甲烷在Mo/HZSM-5催化剂上的无氧转化─在隔离活性位上的反应

报道了无氧条件下甲烷在Ｍｏ／ＨＺＳＭ－５催化剂上转化为高碳的碳氢化合物的新途径。主要产物苯是经由乙烯聚合而成。此反应可能在两个隔离活性位上进行。乙烯作为甲烷活化的初始产物主要在分子筛外表面Ｍｏ活性位上形成,芳烃在分子筛的孔道内Ｂ酸位上形成。因此,我们认为该过程是乙烯中间产物由外表面扩散到分子筛孔道内形成芳烃。     

Synthesis and Characterization of a New Neutral Ionophore for Use in Bulk Optode

Chemical sensors based on optical signal detection are of increasing importance. Optical sensors of bulk optodes have the advantage of being robust and showing a highly reversible response explainable by means of the chemical equilibria involved. Therefore, a great number of new ion-selective bulk optodes have reported within a few years. Several sensors for detecting toxicologically revalant ions,such as Pb²⁺,Ag⁺,Hg²⁺ and UO₂²⁺ have been developed recently and exhibit the low detection limit required. Although a number of ionophores have been used in optodes and ISEs,the sensors described so far are inadequate for monitoring Ag⁺ in water, especially in drinking water because of their limited selectivity and/or insufficient sensitivity. More recently Pretsch et al designed and synthesized an improved optical sensor, methylene bis(2-thiobenzothiazole),which was Ag⁺-selective. Here we report synthesis of another ionophore,1,2-bis(2-thiobenzothiazole) ethane, and its IR, ESI-MS, ¹HNMR and UV-Vis.     

Synthesis and Fluorescence of a New Active Material for Electrochemiluminescent Sensor:Ru(phen)2[phen-NHCO(CH2)4Br](PF6)2

Recently, much attention has been paid to Ru(II) complexes because of their excellent properties of photochemistry, phtophysis. Bis(2,2'-bipyridine)[4-methyl-4'-(6-bromohexyl)-2,2'-bipyridine] ruthenium(II) perchlorate has been used as an active material for electrochemiluminescent (ECL) sensor for selective detection of oxalic acid.It is known that ECL efficiency of Ru(phen)₃²⁺ is much higher than that of Ru(bpy)₃²⁺. In order to make out more efficient ECL sensor, we have designed and synthesized a new Ru(II) complex, Ru(phen)₂[phen-NHCO(CH₂)₄Br](PF₆)₂.