THE STUDY OF SERS EFFECT AND ADSORPTION PROPERTY ON Cu SURFACE FOR PNBA

With different amounts of KCl added in the PNBA(p- nitro benzoic acid) aqueous solution, the factors affecting the SERS (Surface Enhanced Raman Scattering) are studied systematically on the surface of Copper. The results show that in PNBA aqueous solution the occurrence of SERS effect stongly depends on the existence of Cl^-. The amount of KCl added affects not only the emergence and the intensity of SERS effect, but also the adsorption properties such as the adsorption manner,etc.     

ELLIPSOMETRIC SPECTRA OF CONDUCTING POLYANILINE

We report the ellipsometric spectrum studies on a new kind of conducting polymers, polyaniline. In the UV-visible range (1.4-4.8eV photon energy region) the absorption coef-ficient, the complex dielectric function and the refractive index of polyaniline as functions of photon energy are obtained. The spectra of nonconducting and fully conducting polyaniline have been analyzed and discussed. The experimental results show that the emeraldine base form of polyaniline has a large energy gap (E_g～3.6eV) and its absorption spectrum shows a broad exciton absorption peak centered at 2 eV. The absorption spectrum of emeraldine salt after protonation have four absorption peaks centered at 1.5, 1.83, 3.0 and 3.88eV. We also investigated the spectrum evolution of the samples from nonconducting (σ<10^-9Ω^-1·cm^-1) to conducting (σ≈10⁺¹Ω^-1·cm^-1) states, and give the dielectric function and the refractive index of the samples.     

固-液系统中表面增强喇曼散射强度ISERS对浓度c的依赖关系及水杨酸分子的吸附等温特性研究

在恒定温度下,通过测量不同浓度溶液中吸附在Ag镜表面水杨酸分子(SA)的表面增强喇曼散射(SEKS)强度(I_SERS,对固-液系统中吸附在Ag镜表面上SA分子的I_SERS对溶液浓度的依赖关系进行实验研究,并对I_SERS与吸附分子数N^s的关系进行分析讨论。实验研究和理论分析的结果表明:利用SERS技术通过测量I_SERS与溶液浓度c的依赖关系,可为固-液系统中分子在固体表面的吸附过程及吸附特性研究提供 关键词：     

A New Capillary Electrophoresis Apparatus with Piezoelectric Ceramics High Voltage Source and Amperometric Detector

IntroductionHighperformancecapiliar}'electrophoresis(HPCE)isanewanalyticaltechnology'rapidly'developedinrecentyears.Withtheadvantagesofsmallsample.highsensitivity,highresolution.rapidanalysisandverycheaprunning,ithasbeenappliedinchemistry'.lifescienc...     

A new theory for symmetry orbital and tensor (Ⅱ)——Symmetric reduction of molecular integrals and self-consistent field calculations

The symmetry orbital-symmetry orbital tensor method is applied to the evaluation of molecular integrals (one-electron and two-electron integrals) and the symmetry-orbital-tensor and self-consistent-field (SOT-SCF) calculations. A calculation scheme is proposed to simplify the evaluation of integrals and a key equation is derived to reduce the computation efforts in SCF iterations. According to the key equation, compared with the traditional SCF method, the computation efficiencies including CPU timing and external disk (or internal memory) requirement increase in the magnitude of the square of the order of a point group. The new SOT method is expected to be useful in the theoretical calculations of large molecular systems of high point group symmetries.     

交替三线性分解算法与反相高效液相-二极管阵列检测方法相结合同时测定苯二酚的位置异构体

 利用交替三线性分解算法与反相高效液相 二极管阵列检测 (RP HPLC DAD)相结合 ,在洗脱时间为1 0 86min～ 1 399min(间隔 1 / 1 50min)、紫外吸收波长为 2 68nm～ 2 98nm(间隔 1nm)时对苯二酚位置异构体的重叠及光谱体系进行了分辨研究。分辨结果与实际结果一致。同时测定了水溶液中共存的邻苯二酚、间苯二酚和对苯二酚的含量 ,回收率分别为 (1 0 0 1± 1 0 ) % ,(99 4± 1 4) % ,(1 0 0 5± 1 7) %。研究结果表明 :该方法定量快速准确 ,实验操作步骤简单 ,解决了在干扰物存在条件下三者很难同时分辨的问题。     

对“充水玻璃管中气泡运动实验”的商榷

苏科版初中物理教材中通过研究充水玻璃管中气泡的运动规律的实验来探究匀速直线运动规律,但按照教材实验步骤进行操作,观察到的气泡形状与教材配图所示不同,且无法得到预期效果.为此进行了相关实验研究,并对实验过程进行视频拍摄和回放分析,展示了气泡的实际形状,找出了实验难于成功的原因,即教材采用的玻璃管内径太大、长度太小,并提出了修正方案.     

数字微镜光谱仪的互补S编码矩阵的设计及实验

数字微镜光谱仪在应用中编码矩阵的选取至关重要。最佳的理论编码矩阵H矩阵存在非循环、编码复杂、双光路系统实现困难的问题而得不到广泛应用;而最佳实用S矩阵较H矩阵信噪比提高优势略逊。为此本文针对数字微镜光谱仪设计了一种互补S编码矩阵,介绍了其构造、实现过程以及对杂散光和暗电流噪声的削弱作用,通过对其噪声改善程度理论的分析,说明该算法结合了H矩阵与S矩阵的优点,达到了理论与实用的双优。经实验验证,该算法较S矩阵编码模板信噪比提高了2.05倍。     

HPLC分离检测5-氟烟酸与5-氟烟酸乙酯

通过紫外光谱扫描获得两者混合溶液的最佳紫外吸收波长为271nm,以此为检测波长采用反相C18色谱柱,以甲醇+0.025mol.L-1磷酸二氢钾溶液(80+20)为流动相,分离检测了5-氟烟酸和5-氟烟酸乙酯。5-氟烟酸的相对标准偏差为1.9%,平均回收率为99.1%,线性范围为0.05~1.50g.L-1(r=0.9993),5-氟烟酸乙酯的相对标准偏差为1.7%,平均回收率为99.9%,线性范围为0.025~0.85g.L-1(r=0.9997)。