共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
拉曼光谱在催化研究中应用的进展 总被引:8,自引:0,他引:8
催化科学与技术的发展与催化研究方法的发展是密不可分的。特别是在催化新材料和新反应的不断探索过程中 ,催化新表征技术起着很重要的作用。在过去的几十年中 ,特别是自 6 0年代以来 ,催化研究领域发展了一系列催化研究的新方法 ,几乎利用了现代科学发展所派生出来的所有新技术 ,包括基于光 ,声、电、磁 ,电子、原子、离子和热的原理所研制出的现代物理技术。拉曼光谱是一项重要的现代分子光谱技术 ,被广泛应用于化学、物理和生物科学等诸多学科领域 ,是研究物质分子结构的有力工具。 70年代起拉曼光谱被应用于催化领域的研究 ,在担载型金… 相似文献
4.
拉曼光谱在分析化学中的应用进展 总被引:6,自引:0,他引:6
评述了各种拉曼技术在分析化学方面的应用进展,涉及到的拉曼光谱技术有常规拉曼光谱、常规共振拉曼光谱、表面增强拉曼光谱、表面增强共振拉曼光谱、傅里叶变换拉曼光谱、傅里叶变换表面增强拉曼光谱及其联用技术。共引用91篇文献。 相似文献
5.
论述了激光拉曼光谱对高分子结构、结晶形态和表征,反应动力学过程和取向的研究,还介绍了纵向声学模、共振、高温高压、光波导和付里叶拉曼光谱在高分子研究中的最新进展。 相似文献
6.
7.
拉曼光谱作为一种强大的工具,被广泛应用于聚合物结构的表征.随着共振拉曼光谱、扫描角度拉曼光谱、高分辨率拉曼成像、极化拉曼光谱、表面增强拉曼散射等拉曼技术的迅速发展,拉曼光谱的应用范围不断扩大.本文首先介绍了拉曼光谱设备的基本原理和组成,总结了拉曼技术的实验技巧和数据处理中需要注意的问题,讨论了红外光谱和拉曼光谱的区别,在此基础上,综述了近十年来拉曼技术在聚合物结构表征领域的最新应用和研究进展.其应用包括以下六个方面:高分子链的构象、聚合物的聚集状态、聚合物结晶度的计算、高分子链的取向、外场作用下的结构转化、高分子共混物化学或物理成分的识别.最后,对拉曼光谱在聚合物研究中的发展进行了展望.希望本文能够对试图从拉曼光谱中获取聚合物结构信息的学者有所帮助. 相似文献
8.
9.
10.
11.
12.
13.
本文用分光光度和拉曼光谱两种方法,对比研究了Triton X-100或聚乙烯醇(PVA)对结晶紫-磷钼杂多酸缔合物(CV-PMo)的增溶、增敏作用,在适宜的实验条件下,不论CV-PMo-Triton X-100体系,还是CV-PMo-PVA体系,都可用于在水相中分光光度测定痕量磷。本文还对这两类显色体系的有关反应机理,作了讨论和比较。 相似文献
14.
Ce0.5Zr0.5O2固溶体的原位拉曼光谱 总被引:11,自引:0,他引:11
控制合成条件以湿化学法制备了Ce-Zr-O(Ce)/n(Zr)=1固溶体,XRD结果证实催化剂前体经923K焙烧后可获得立方相Ce0.5Zr0.5O2固溶体,TE倒固溶体颗粒大小均一、分散、呈纤毛状、在氧化和还原气氛条件下分别对固溶体进行了原位拉曼光谱研究,结果表明,除450-470cm^-1处出现而心立方晶格F2g拉曼地应的强拉曼谱峰外,290-320cm^-1,57-620cm^-1,770- 相似文献
15.
The comparison of Raman spectra of the chondrites (C, H, L, LL) has confirmed thatthere exist two types of meteorite carbon: one is the primary carbon present in carbonaceouschondrites (c) and the other is the secondary carbon contained in ordinary chondrites (H, L,LL). The parameter of order (I_G/I_D intensity ratio, similarly hereinafter) of primary car-bon tends to decrease with increasing petrologic type and it can reflect the temperature ofdust carrier at the time plasma gases in the early nebula were condensed to form primarycarbonaceous material and the hydrogen content in primary carbonaceous material. This kindof primary carbonaceous material maybe has not experienced late stage thermometamorphismwithin the parent body of chondrites, indicating that the carbonaceous chondrites wereformed and retained in the low temperature region of the solar system. The parameter oforder of the secondary carbon tends to increase with increasing petrologic type and it can re-flect the degree of graphitization o 相似文献
16.
Wladyslaw Reimschüssel Halina Abramczyk Jacek Michalak 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):201-211
Abstract 2-Chloro-5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinane has been studied in CCl4, CHCl3 and CD3CN solutions by IR and Raman line shape analysis. Equilibrium process of dimerization and ring conversion in CCl4 solutions have been considered. On the contrary to the commonly expected dominance of the conformer with the equatorial oriented P[dbnd]O bond for 2-halo-2-oxo-1,3,2-dioxaphosphorinanes, it was found that for the 2-chloro derivative both conformers are nearly equally distributed. It has been shown that the interactions induced absorption is an important mechanism of relaxation in the studied compound and this mechanism gives significant contribution to the total IR band broadening, while the interaction induced light scattering is negligible. The obtained results show that the molecular dynamics method can be useful in studying cyclic compounds in solutions. 相似文献
17.
Siegfried Schneider Peter Halbig Harald Grau Ulrich Nickel 《Photochemistry and photobiology》1994,60(6):605-610
Abstract This paper describes a new method for the preparation of silver colloids with a narrow range of particle size to be used in surface-enhanced Raman spectroscopy. Using malachite green as a strongly adsorbing dye, it can be shown that colloids from different preparation batches exhibit the same enhancement factor within an error margin of about 15%. By varying the number of nucleation centers, the particle size can be determined at will. An increase in particle diameter from about 38 to about 76 nm leads to an estimated five-fold increase in surface enhancement. 相似文献
18.
19.
The in-situ transient ESR measurements reveal that the oxidized structure (PP++) of polypyrrole (PP) films has an electrocatalytic activity to the oxidation of pyrrole during the electropolymerization process. Surface-enhanced resonance Raman scattering (SERRS) effect was used to probe the structure of PP films in very early stages of the polymerization on gold electrodes. It is of special interest that the electropolymerization can take place at much less positive potentials (about 300 mV) under the irradiation of light. This photocatalytic effect may be applied to the pattern deposition of polymers. 相似文献
20.
[n—C12H25NH3]2ZnCl4配合物相变拉曼光谱研究 总被引:3,自引:3,他引:3
通式为[C_nH_(2n 1)NH_3]_2MX_4(M=Cu,Mn,Zn…、X=Cl,Br)(简写C_nM)四卤合金属酸二烷基铵系列化合物一般具有二维层结构。它是由薄的无机层阴离子MX_4~(2-)和厚的烷基铵阳离子[R-NH_3]~ 组成的碳氢层规则交替构成的“夹心面包”型体系。这类化合物常存在固-固相变,并且有较大的相变潜热,有可能成为很有应用前景的一类新的低温储能材 相似文献