聚乙烯膜上丙烯酸辐照接枝聚合的XPS研究

用氮气氛下预辐照方法制备了丙烯酸接枝聚乙烯(PE)膜,用重量法测定了接枝率。结果表明,在相同剂量率下接枝率随总剂量的增加而增高。XPS研究表明,表面聚丙烯酸(PAA)与PE的摩尔比与接枝率有一定的关系,从而成为其XPS表征的基础。XPS和SEM研究表明,PAA在PE膜表面分布呈不均匀状态,可能有一部分PE表面未被接枝,这个结果对于功能膜的制备具有指导意义。

等离子体改性聚丙烯膜表面的XPS研究

介绍用等离子体技术对PP膜(PPF)表面进行改性处理。所用等离子体气氛分别为Ar、N_2、O_2和空气,处理压力13.3Pa、功率80W、处理时间10min。通过XPS(X射线光电子能谱)研究了改性前后聚合物表面的元素组成、相对含量变化、表面官能团的类型。采用曲线拟合分峰技术对谱图进行数学处理。结果表明,在氧气氛中处理PPF膜,表面氧含量可达18.93%、在氮气氛中处理,表面氮量可达4.76%。处理后的PPF表面,由于氧和氮与碳形成了活性基团,C—O、C—NH_2、C=O、—CONH—和COOH,从而提高了PPF表面的活性。此外,通过处理功率和压力对PPF表面结构影响的实验表明,两者对PPF表面的O和N含量无明显影响。

电子束法沉积ITO膜的XPS研究

采用电子束蒸发法制备了均匀、致密、透明导电的ITO膜。讨论了其光电性能,并用XPS技术研究了ITO膜的表面组成、结构和状态。

Li_2S-SiS_2-LiBO_2-LiC1体系玻璃的XPS研究

本文采用光电子能谱分析方法，首次研究Li2S-SiS2-LiBO2-LiCl体系玻璃的硫氧化物锂离子导体的组成，结构和状态。指出在玻璃体系中，除了与硅相键合的桥硫存在外，还有不与硅相键合的非桥硫存在；这些硫呈现SO42-和S6+状态。玻璃中的硫取代了氧的位置，进入玻璃网络中使结构紧密交联。本文对玻璃网络中的元素状态和成键机理进行了讨论。

ISOLATION AND PROPERTIES OF MOLYBDENUM SERIES OF HETEROPOLY BLUE WITH KEGGIN STRUCTURE

The present paper reports the methods for preparing and isolating 8 kinds of 1:12 molybdenum series of heteropoly blue complexes KyHzXMo12O40 . nH2O (X=Si, P, As, Ge). The products were characterized by elemental analyses, potential titration, polarograms, cyclic voltammetry, IR spectra, visible-UV spectra, X-ray powder diffraction, XPS and P-31 NMR. The single crystal structure of 4-electron molybdenum-silicon heteropoly blue was measured and the positions of reduced molybdenum atoms were determined, i.e. they were located at Mo(3), Mo(7), Mo(8) and Mo(10). The experimental results show that the heteropoly blue remains Keggin structure. ESR spectra of heteropoly blue solids were first studied, from which it was found that the delocalization extent of 2-electron heteropoly blue and 4-electron heteropoly blue is smaller than that of 1-electron heteropoly blue. The study of thermal properties shows that the thermal stability increases with the increase of the reduction extent of heteropoly blue. The study of redox properties shows that the oxidizing power order of heteropoly blue changes in different mediums, and the polarographic half-wave voltage is found to be dependent on the electronegativity of the hetero atom linearly. It is found that the phosphorus heteropoly blue and arsenic heteropoly blue show a strong anti-acid property.

EVALUATION OF THE RELIABILITY OF KALMAN FILTERING RESULTS IN INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION-SPECTROMETRY

This paper deals with the evaluation of the reliability of the analytical results obtained by Kalman filtering. Two criteria for evaluation were compared: one is based on the autocorrelation analysis of the innovation sequence, the so-called NAC criterion; the other is the innovations number, which actually is the autocorrelation coefficient of the innovation sequence at the initial wavelength. Both criteria allow compensation for the wavelength positioning errors in spectral scans, but there exists a difference in the way they work. The NAC criterion can provide information about the reliability of an individual result, which is very useful for the indication of unmodelled emissions, while the innovations number should be incorporated with the normalization of the innovations or seek the help of the sequence itself for the same purpose. The major limitation of the NAC criterion is that it does not allow the theoretical modelling of continuous backgrounds, which, however, is convenient in practical analysis and can be taken with the innovations number criterion.

MONOLAYER FORMATION OF A NOVEL AMPHIPHILIC POLYMER PAMC16S

Poly(2-acrylamido-hexadecylsulfonic acid) (PAMC16S) forms a stable monolayer on a pure water surface. More closely packed monolayers can be obtained when the subphase contains Cd2+ or Ca2+. Self-assembled monolayers have been formed on gold surfaces and characterized by contact angle measurement, XPS and electrochemical analysis. The results show that the monolayers are hydrophobic with the hydrophilic sulfonic acid groups adjacent to the metal surfaces and with the hydrocarbon chains extended from the surfaces. The monolayers exhibit great adsorption stability during the faradaic reactions, illustrating the advantage of polymeric LB films in potential applications.

XPS STUDY OF RADIATION CROSS-LINKED COPOLYMER OF TETRAFLUOROETHYLENE WITH HEXAFLUOROPROPYLENE

In this work the radiation-induced structural changes in F-46 were studied by XPS. In carbon-1s spectra of a highly crosslinked F-46 sheet, the slight increase observed in relative area under the peak due to CF3 was explained by the radiation-induced scission of polymer chains. The peak at 287.6 eV appearing in the spectra caused by ionizing radiation was attributed to carbon structures without primary fluorine substituents, in both branching and unsaturated structures, while that at 289.3 eV was assigned to = CF groups in mid-chain double bonds.

CYCLIC VOLTAMMETRIC AND SPECTROELECTROCHEMICAL STUDIES OF COPPER IN ALKALINE-SOLUTION

The behaviour of the electroplated copper film electrode on tin oxide/glass or glassy carbon surface was studied in potassium hydroxide medium by cyclic voltammetry and in situ transmission spectroelectrochemistry. The results indicate that the electroplated copper film electrode is similar to a copper electrode and cyclic voltammetry with this electrode affords more resolution. The anodic peaks were found to correspond successively to the adsorption of oxygen, the formation of a surface layer of Cu2O, the formation of a surface layer of Cu(OH)2 or CuO and formation of a thick multilayer film of CuO. This is the first time it has been proposed that a surface layer of Cu(OH)2 or CuO is formed from the oxidation of the surface layer of Cu2O. Similarly, a clear interpretation is presented that the cathodic peaks correspond successively to the reduction of CuO to Cu2O, the reductions of Cu2O to Cu and the soluble Cu(II) species to Cu. On the other hand, a shoulder peak related to the chemical transformation of Cu(OH)2 to CuO was first observed.

等离子体改性的聚偏氟乙烯表面结构的XPS研究

采用5种气氛等离子体处理聚偏氟乙烯(PVF_2)基片,用XPS研究了PVF_2表面结构的变化。结果表明,处理后的PVF_2基片表面嵌入了C—O,C—NH_2,—CHF和COOH基团,因而改变了表面性质。

稀土氧化谷胱甘肽配合物的XPS研究

谷胱甘肽是人体内重要低肽,具有许多生物功能。正常状态下,体内主要以还原型(GSH,-O_2CCH(NH_3~(+))CH_2CH_2C∶ONHCH(CH_2SH)C∶ONHCH_2CO_2H)存在,氧化型(GSSG、(-O_2CCH(NH_3~(+))CH_2CH_2C∶ONHCH(CH_2S-)C∶ONHCH_2CO_2H)_2)只占还原型浓度的～1%,并由谷胱甘肽氧化还原酶维持二者的平衡。近年来发现,某些金属离子可以催化氧

Li_2S-SiS_2-LiBO_2-LiCl体系玻璃的XPS表征

本文采用光电子能谱分析方法,首次研究Li_2S-SiS_2-LiBO_2-LiCl体系硫氧化物玻璃锂离子导体的组成、结构和状态。指出在该玻璃体系中,除与硅(硼)相键合的桥硫存在外,还有不与硅(硼)相键合的非桥硫存在;玻璃中的硫取代了氧的位置,进入玻璃网络中使结构紧密交联。对网络中的元素状态,成键及性能进行了讨论。

聚乙烯膜辐照接枝丙烯酸的XPS表征

用辐照方法,使亲水单体在聚烯烃类高分子材料表面接枝聚合,从而改善这些材料的亲水性,同时也可用这种方法来制备具有所需性能的膜材料(作离子交换膜、反渗透膜等),是一个较热门的研究课题。

聚三甲硅基丙炔膜表面改性的XPS研究——Ⅰ.用N-溴代丁二酰亚胺的表面改性

用N-溴代丁二酰亚胺的丙酮溶液在回流温度下对三甲硅基丙炔的均聚物和共聚物作了表面改性。XPS的研究表明,试样表面层中Br原子含量随溴化时间的增长而增加,C_(IS)谱变宽且产生来自C-O和C-Br结构的新谱线。红外光谱证明溴化反应产生CH_2Br结构。溴化使膜的气透性发生相应的变化,即α_(O_2/N_2)值增高,P_(O_2)值降低。

电子束法沉积ZnIn_2Se_4膜的结构与XPS表征

研究了电子束法沉积ZnIn_2Se_4薄膜的工艺条件,所得致密、均匀膜的导电类型可以通过不同气氛处理得到控制。该膜的最佳参数为:电阻率ρ为2.35×10~(-1)Ω·cm,Hall迁移率μ_H为106cm~2·V~(-1)·S~(-1),载流子浓度N是1.51×10~(17)cm~(-3),禁带宽度E_(?)为2.23eV。采用XPS技术研究了膜的组成、结构、价态。