用LB膜技术组装α—Fe2O3超微粒的研究

用超声分散的方法将α－Ｆｅ２Ｏ３超微粒分子用于硬脂酸／正己烷／氯仿溶液中，用ＬＢ膜进行有序组装。结果显示：α－Ｆｅ２Ｏ３超微粒能均匀地分散在有机溶剂中，α－Ｆｅ２Ｏ３超微粒／硬脂酸单分子膜的成膜性能良好，复合膜中的α－Ｆｅ２Ｏ３超微粒有一定的有序性，α－Ｆｅ２Ｏ３超微粒硬脂酸复合ＬＢ膜具有层状结构。     

含ME4(M＝Mo,W;E＝S,Se)单元簇合物的合成和红外谱表征

合成了一系列单立方烷Ｍ－Ｆｅ－Ｓｅ和Ｍ－Ｃｕ（Ａｇ）－Ｓ（Ｓｅ）簇合物,并用ＵＶ,ＩＲ和Ｘ－光衍射等方法对上述簇合物进行了分析。     

含MoFe3S4单元的μ2-OR或μ2-SR桥联双类立方烷簇合物的红外光谱研究

对下列含ＭｏＦｅ３Ｓ４ 单元的μ２－ＯＲ或μ２ －ＳＲ桥联双类立方烷簇合物的红外光谱进行了研究：（Ｅｔ４ Ｎ）３［Ｍｏ２Ｆｅ６ Ｓ８Ｃｌ６ （ＯＭｅ）３ ］（１）,（Ｅｔ４ Ｎ）３ ［Ｍｏ２ Ｆｅ６ Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（２）,（Ｂｕ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（３）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＢｕｔ）６（ＯＭｅ）３］（４）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）９ ］（５）。通过这系列簇合物特征振动频率和结构参数及与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的比较,对其νＭ ｏ－μ２Ｏ（Ｒ） ,νＭ ｏ－μ２Ｓ（Ｒ）,νＭ ｏ－Ｓ,νＦｅ－Ｓ,νＦｅ－ＳＲ,νＦｅ－Ｃｌ 进行了归属。对其中两条途径的亲电诱导效应及Δν（即νＭ ｏ－Ｓ－νＦｅ－Ｓ）与Ｆｅ→Ｍｏ 电荷迁移的关系进行了探讨。最后,讨论了桥联双类立方烷与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的共性和差异。     

ZnSe－CdZnse多量子阱光双稳器件的研制

本文采用电化学选择性腐蚀工艺对ＧａＡｓ衬底蚀孔，在其上获得了大面积具有光滑表面的Ⅱ－Ⅵ族半导体多量子阱外延膜．通过在其表面蒸镀反射膜，制成了高质量的Ｆ－Ｐ腔，制备出ＺｎＳｅ－ＣｄＺｎＳｅ多量子阱Ｆ－Ｐ腔光双稳器件．     

薄膜物理及其应用讲座第五讲Fe－Si／X（Si，Cu，Pd，Cr）多层膜的磁性研究

系统研究了由非晶态Ｆｅ－Ｓｉ合金与Ｓｉ，Ｃｕ，Ｐｄ和Ｃｒ四种不同类型的材料组合而成的磁性多层膜的二维磁性，界面的死层效应和极化效应，层间耦合作用。在Ｆｅ－Ｓｉ／Ｃｒ多层膜研究中，发现了饱和磁化强度随Ｃｒ层厚度的改变而出现振荡变化的现象，这是由于磁性层甲内场的变化，特别是顺磁分量发生振荡变化引起的。     

薄膜物理及其应用讲座：第五讲 Fe—Si／X（Si,Cu,Pd,Cr）多层膜的磁性研究

系统研究了由非晶态Ｆｅ－Ｓｉ合金与Ｓｉ、Ｃｕ，、Ｐｄ和Ｃｒ四种不同类型的材料组合而成的磁性多层膜的二维磁性，界面的死层效应和极化效应，层间耦合作用，在Ｆｅ－Ｓｉ／Ｃｒ多层膜研究中，发现了饱和磁化强度随Ｃｒ层厚度的改变而出现振荡变化的现象，这是由于磁性层中内地场的变化，特别是顺磁分量发生振荡变化引起的。     

[Fe/Cr]多层膜及掺入Si中介层后的层间耦合和磁电阻效应

用真空蒸镀方法制备了［Ｆｅ／Ｃｒ］，［Ｆｅ／Ｃｒ／Ｓｉ］和［Ｆｅ／Ｓｉ］多层膜．研究了Ｃｒ层、Ｓｉ层和Ｃｒ＋Ｓｉ层厚度变化对层间耦合和磁电阻的影响．Ｆｅ层厚为２ｎｍ，Ｃｒ层厚度变化存在耦合振荡和巨磁电阻及其振荡．磁电阻值为１４.６％（４.２Ｋ）．在Ｃｒ层中加入一半Ｓｉ层或全部由Ｓｉ层替代，振荡消失，磁电阻减小到千分之几．根据掺Ｓｉ层后多层膜的电阻率变化，认为Ｓｉ加入使非磁层中自由电子数减少，随之极化效应也变弱，导致振荡消失，磁电阻大为降低 关键词：     

含MoFe3S4单元的μ2—OR或μ2—SR桥联双类立方烷簇合物的红？…

对下列含ＭｏＦｅ３Ｓ４单元的μ２－ＯＲ或μ２－ＳＲ桥联双类立方烷簇合物的红外光谱进行了研究：（Ｅｔ４Ｎ）３「Ｍｏ２Ｆｅ６Ｓ８Ｃｌ６（ＯＭｅ）３」（１）,（Ｅｔ４Ｎ）３「Ｍｏ２Ｆｅ６Ｓ８（ＳＰｈ）６（ＯＭｅ）３」（２）,（Ｂｕ４Ｎ）３「Ｍｏ２Ｆｅ６Ｓ８（ＳＰｈ）６（ＯＭｅ）３」（３）（Ｅｔ４Ｎ）３「Ｍｏ２Ｆｅ６Ｓ８（ＳＢｕ＾ｔ）６（ＯＭｅ０３」（４）ｍ,（Ｅｔ４Ｎ）３「Ｍｏ２Ｆｅ６Ｓ８（ＳＰｈ）９」     

机械合金化Fe—Cu系统的EXAFS研究

ＥＸＡＦＳ研究Ｆｅ－Ｃｕ系二元金属的Ｆｅ和Ｃｕ配位环境随球磨时间及组成的变化情况，结果表明机械合金化方法能扩展Ｆｅ和Ｃｕ金属的固溶范围并形成纳米尺寸的非平衡亚稳态合金晶粒，Ｆｅ３０Ｃｕ２０（１６０ｈ）中Ｃｕ的Ｋ吸收谱和ＲＳＦ出现ｂｃｃ结构的下，其Ｆｅ－Ｃｕ的合昌粒为ｂｃｃ结构；Ｆｅ６０Ｃｕ４０（１６０ｈ）中Ｃｕ和Ｆｅ的ＲＳＦ都为ｆｃｃ结构，其合金晶粒的结构与Ｆｅ３０Ｃｕ２０的不同，为ｆｃｃ结构，但     

BaFe12O19包覆γ—Fe2O3复合磁粉的微结构及其磁性能研究

采用表面包覆法合成了一系列不同包覆量的ＢａＦｅ１２Ｏ１９－γ－Ｆｅ２Ｏ３复合磁粉,以Ｘ射线衍射为主要测试手段,仔细分析了不同包覆量下复合粒子的结构。研究表明;由于高温下离子在扩散作用,使得在ＢａＦｅ１２Ｏ１９和γ－Ｆｅ２Ｏ两相之间形成了一层过渡层,正是由于过渡层的存在,致使复合粒子的磁性能随ｘＢａＦｅ１２Ｏ１９的变化有一定滞后。     

Corrosion protection by sonoelectrodeposited organic films on zinc coated steel

A variety of coatings based on electrosynthesized polypyrrole were deposited on zinc coated steel in presence or absence of ultrasound, and studied in terms of corrosion protection. Cr III and Cr VI commercial passivation were used as references. Depth profiling showed a homogeneous deposit for Cr III, while SEM imaging revealed good surface homogeneity for Cr VI layers. These chromium-based passivations ensured good protection against corrosion. Polypyrrole (PPy) was also electrochemically deposited on zinc coated steel with and without high frequency ultrasound irradiation in aqueous sodium tartrate-molybdate solution. Such PPy coatings act as a physical barrier against corrosive species. PPy electrosynthesized in silent conditions exhibits similar properties to Cr VI passivation with respect to corrosion protection. Ultrasound leads to more compact and more homogeneous surface structures for PPy, as well as to more homogeneous distribution of doping molybdate anions within the film. Far better corrosion protection is exhibited for such sonicated films.     

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Hydrophobic properties of thin nanostructured silver films produced by galvanic exchange reaction on a copper surface were studied after passivation with stearic acid. The morphology of the silver films was controlled by varying the concentration of silver nitrate in the solution. Water contact angle as high as 156° and contact angle hysteresis as low as 5° were achieved for samples obtained with initial silver ion concentration of 24.75 mM in the solution. However, a strong dependence of contact angle and contact angle hysteresis on the fractal-like morphology of the silver films was observed with the variation of silver ion concentration.     

水性丙烯酸聚氨酯涂料中反应性缓蚀剂掺入及其耐蚀性能

利用磷酸和双酚A环氧树脂反应得到功能性缓蚀剂羟基环氧磷酸酯(HEP). 将其添加到水性羟基丙烯酸树脂中,再与水性异氰酸酯固化剂交联,制备了水性羟基环氧磷酸酯/丙烯酸聚氨酯复合涂层(HEP-APU). 由于磷酸酯基团可以与金属基体发生反应,在金属表面形成一层磷化膜,极大的提升了金属的抗闪蚀能力. 利用电化学阻抗谱和极化曲线研究HEP-APU复合涂层对Q235碳钢在3.5wt% NaCl溶液中耐蚀性能. 结果表明,HEP-APU涂料对Q235碳钢具有优越的钝化和耐腐性能,且当HEP在水性丙烯酸聚氨酯涂料中质量分数为0.5%时,所得到的复合涂层的防腐性能最佳.     

X-ray photoelectron spectroscopy for surface film analysis in corrosion research

Surface films on metals and alloys often protect them from reaction with the environment, and hence a knowledge of their protective properties and composition could be invaluable for predicting their corrosion behaviour. XPS (x-ray photoelectron spectroscopy) could provide a quantitative analysis of the chemical composition, the nature of valence states and elemental distribution within the surface films. The present paper reviews the potential of this technique in corrosion studies. A brief review of the work done on the passivation of iron and iron-chromium alloys and on the inhibition studies on copper base alloys has been given. A few examples of investigations carried out at authors’ laboratory are also included. An attempt has been made to establish a correlation between the compositions of the films formed and corrosion behaviour of carbon steel in 10.5 pH lithium hydroxide solution and of Cu-Ni alloys and sacrificial Al-Zn-Sn alloys in synthetic sea-water.     

Synergistic inhibitive effect of tartarate and tungstate in preventing steel corrosion in aqueous media

The inhibitive effect of tartarate was studied as a coinhibitor with tungstate in preventing carbon steel corrosion in aqueous solutions. Open circuit potential measurements, weight-loss measurements and polarization studies were conducted to understand the domains of corrosion and passivation. Tartarate ions, even at low concentration, showed excellent synergistic corrosion inhibition characteristics. A mixture of 500 ppm each of the inhibitors was found to be optimum inhibitor combination. This inhibitor combination showed inhibition efficiency as high as 98%. Tartarate in the synergistic inhibitor combination did not reveal any dominant role in shifting the surface potential, even though it showed substantial passivation effect. The present study explores and evaluates the synergistic combination as a potential inhibitor system in combating corrosion on carbon steel surface.     

Fabrication of superhydrophobic surface of hierarchical ZnO thin films by using stearic acid

Flower-like hierarchical ZnO microspheres were successfully synthesized by a simple, template-free, and low-temperature aqueous solution route. The morphology and microstructure of the ZnO microspheres were examined by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The bionic films with hydrophobicity were fabricated by the hierarchical ZnO microspheres modified by stearic acid. It was found that the hydrophobicity of the thin films was very sensitive to the added amount of stearic acid. The thin films modified with 8% stearic acid took on strong superhydrophobicity with a water contact angle (CA) almost to be 178° and weak adhersion. The remarkable superhydrophobicity could be attributed to the synergistic effect of micro/nano hierarchical structure of ZnO and low surface energy of stearic acid.     

An in-situ study of structure and magnetic properties of Fe films on the sulphur passivated Ge(100) surface at 150°C

Ultra-thin Fe films have been grown on the sulphur passivated Ge(100) surface at 150°C. The growth, structure and the magnetic properties of the thin films were studied with LEED, AES, angle resolved AES and in-situ magneto-optical Kerr effect measurements. For the first five monolayers of Fe, no long-range order was observed . However, angle resolved AES data suggest that local order occurs with a small fraction of the Fe atoms adsorbed on bcc sites. For thicker Fe films, the growth becomes ordered. A comparison of the present study and with a previous study of the growth of Fe on sputter cleaned Ge(100)(2×1) surface, shows that sulphur passivation effectively prevents Fe–Ge intermixing. During the Fe deposition process, most of the sulphur atoms migrate to the growing surface, thus acting as surfactants. The presence of sulphur at the surface also affects the growth and magnetic properties of the thin films.     

Characteristics of CO2 corrosion scale formed on N80 steel in stratum water with saturated CO2

The component and structure of CO₂ corrosion scale formed on N80 tubing steel were studied by using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM); the electrochemical property of N80 steel covered by corrosion scale was investigated by electrochemical impedance spectroscopy (EIS). The results shows a double-layer structure of the corrosion scale, in which the principal component of the outer layer is FeCO₃ with a limited amount of ∂-FeOOH; while for the inner scale, FeCO₃ is still the major component, but some Fe positions in FeCO₃ lattice are substituted by Ca, and form a composite compound of (Fe,Ca)CO₃ in the inner scale. EIS study shows that the anodic impedance spectrum has three time constants, i.e., the capacitance at high frequency, Warburg impedance at middle frequency and capacitance at low frequency.     

Formation and characterization of high-density Fe cluster-assembled films with soft magnetic behaviors

High-density, magnetically soft Fe cluster-assembled films were obtained at room temperature by an energetic cluster deposition. Size-monodispersed Fe clusters with the mean cluster size d = 9, 13 and 16 nm were produced using a plasma-gas-condensation technique. Ionized clusters in cluster beam were accelerated electrically and deposited onto the substrate together with neutral clusters from the same cluster source. The morphology, microstructure and magnetic properties of the cluster-assembled films have been studied by an atomic force microscopy, scanning electron microscopy, transmission electron microscopy, and superconducting quantum interference device magnetometer. By increasing the impact energy of the ionized clusters up to 0.6 eV/atom, the Fe cluster-assembled film has a packing fraction of 0.86±0.03, and reveals a soft magnetic behavior. In addition, it is found that oxidization of the cluster-assembled films is remarkably suppressed with the increase in the density of the films.     

Investigation of the inhibitive effect of triphenyltin 2-thiophene carboxylate on corrosion of steel in 2 M H3PO4 solutions

A new organic compound was synthesised and tested as corrosion inhibitor of steel in phosphoric acid medium using gravimetric, electrochemical polarisation and electrochemical impedance spectroscopy (EIS) measurements. Results obtained show that the inhibitor studied is a good cathodic inhibitor. EIS results show that the change in the impedance parameters (R_T and C_dl) with concentration of triphenyltin 2-thiophene carboxylate (TTC) is indicative of the adsorption of molecules leading to the formation of a protective layer on the surface of steel. The effect of the temperature on the steel corrosion in 2 M H₃PO₄ and with addition of various concentrations of TTC in the range of temperature 298-348 K was studied. The associated apparent activation corrosion energy has been determined.