罗丹明6G缔合微粒共振散射光谱法测定过氧化氢

在0.020mol.L-1HCl-4.0×10-4mol.L-1KI-1.6×10-5mol.L-1Mo(Ⅵ)介质中,罗丹明6G(RhG)在540nm处有1个荧光峰,在540nm处有1个同步荧光峰。当有H2O2存在时,H2O2与过量的I-反应生成I3-,I3-与RhG形成缔合微粒,在320,400,595nm处产生3个共振散射(RS)峰;而在540nm处荧光峰猝灭。H2O2浓度在0.068~34μg.mL-1范围内与400nm波长处的共振散射光强度呈线性关系。据此建立了一个测定水中H2O2的共振散射光谱分析法。光谱研究结果表明,(RhG-I3)n缔合微粒和界面的形成是导致体系RS增强和荧光猝灭的根本原因。     

Stratonovich Anticipative Stochastic Differential Equations In The Plane

We apply the techniques of the quasi-sure analysis to prove that the stochastic differential equation in the plane with smooth and nondegenerate initial condition can be solved     

甲醇水蒸气重整制氢独立反应探讨

分析了甲醇重整氢反应可能的反应途径，分析结果表明体系中有2个独立反应，则至少应有2个动力学方程才能描述，利用平衡温距的概念，分析了WGS反应在甲醇水重整反应体系中的作用，根据在固定床反应器上的实验结果，证明变换反应不宜出现在动力学模型中，合理的动力学模型认为水蒸气重整反应和甲醇分解反应平行进行，CO和CO2同时生成。     

基于变分Monte Carno计算的H2分子势能曲线的可靠性

基于Alexander and Coldwell报道的变分Monte Carno计算的势能曲线,计算了H2分子的振转能级.利用Murrell-Sorbie函数和最小二乘法拟合出了解析势能函数,以此为基础计算出光谱常数.通过与实验比较发现:由于该势能曲线考虑了相对论效应和非绝热效应,振转能级和光谱常数计算结果与实验值符合良好,与目前最高水平从头计算的结果相当,说明这种计算方法准确可靠,可进一步推广应用于势能函数计算之中.     

SURFACE-ENHANCED RAMAN SCATTERING OF WATER IN HIGHLY CONCENTRATED NaClO_4 SYSTEMS

A highly concentrated NaClO_4 as a main supporting electrolyte was used to break hydrogen-bonded water structure in systems studied, by which strong surface-enhanced Raman scattering (SERS) signals of water from silver electrodes were detected in the system having a ten times lower halide concentration than the ordinary one; and a similar phenomenon was also observed in a system containing pseudo-halide SCN~- ions. The SERS spectra obtained in 0.1 mol/L LiCl and 3.0 mol/L LiClO_4 indicate the presence of two kinds of water molecules with very different behaviors on the surface. This peculiar phenomenon is discussed in details. It is achievable to extend SERS study on adsorbed water by adequate choice of electrolyte and control of surface treatment to the electrode in order to have a deeper insight into the complex structure of the electrochemical interface.     

Effect of Cl~-ion on Anodic Iron Dissolution in H_2S-Containing Sulfuric Acid Solutions

ResearchershavestudiedtheeffectofCI-onthestructureandpropertiesofthecorrosionproductsinchloridesolutionscontainingH,S"'.IthasbeenfoundthattherearenocorrosioneffectsonironsurfaceswhicharesubmergedinconcentratedacidicchloridesolutionswithlowHZSlevel.Inthepast,theinteractionbetweentheCI-ionandFehasnotbeenstudiedcompletelyandintensively.TheanodicreactionofironinacidicsolutionscontainingHZSwastheironoxidationcatalyzedbyHS-3.WhenCI-ispresentinHZS-containingacidicsolutions,theeffectofCI-onir…     

三聚氰胺(C_3N_6H_6)的高压Raman与压致结构相变研究

本文在8 7GPa压力范围内研究了三聚氰胺(C3N6H6)的高压原位Raman光谱。通过内、外Raman活性模的压致效应,发现在1 5GPa和6 0GPa压力下该分子晶体发生了压致结构相变。用空间群相关原理确认在1 5GPa压力下它从单斜相转变为三斜相;在6 0GPa压力下又发生了另一次结构相变。然后在室温高压条件下对三聚氰胺进行了原位同步辐射能量散射x-ray衍射实验(EDXD),在14 7GPa压力范围内,观察到常压下为单斜晶系的三聚氰胺经历了两次压致结构相变。在1 3GPa下,三聚氰胺分子晶体从单斜相转变为三斜相;在8 2GPa又转变为正交相。本实验结果为利用三聚氰胺碳氮有机分子晶体高温高压合成超硬C3N4共价晶体的研究提供了重要信息。     

Enhancement of H2 Sensing Properties of In2O3-based Gas Sensor by Chemical Modification with SiO2

The sensitivity and selectivity to H2 of a new In203-based gas sensor were improved significantly by surface chemical modification. A dense layer of SiO2 near the surface of the porous In2O3 bead was formed by chemical vapor deposition (CVD) of diethoxydimethysilane (DEMS). The dense layer functioned as a molecular sieve, thereby the diffusion of gases with large molecular diameters, except for 1-12, was effectively controlled, resulting in a prominent selectivity and high sensitivity for H2. The working mechanism of the sensor was also presented.     

1，1－二氯双硅烷热分解的理论研究

用ＭＮＤＯ方法研究了１，１－二氯双硅烷的热分解反应，得到了两条反应途径及其过渡态，证明了１，１－二氯双硅烷的热分解是通过１，２－氢迁移和２，１－氢迁移实现的。     

用浓H2SO4-K2Cr2O7改性煤基活性炭催化合成乙酸正丁酯

乙酸正丁酯是一种重要的化工原料,也可广泛应用于食品工业、医药工业中作香料、溶剂等。它的传统合成方法是在硫酸催化下,冰乙酸和正丁醇进行酯化制得,但此法有很多公认的缺点[1,2]。近年来人们不断探索新型催化剂来代替硫酸,国内外研究较多的催化剂有无机盐[3,4]、固体酸[5-7]