Fabrication and characterization of multi-component organosilane nanofilms

Multi-component micropatterned organosilane monolayers are fabricated on a Si-wafer substrate by stepwise site-specific vacuum ultraviolet (VUV)-ray photodecomposition and chemisorption. The introduction of different organosilane components is confirmed by X-ray photoelectron spectroscopy (XPS). Atomic force microscopic and lateral force microscopic observations reveal that the line-widths of the micropatterned surface correspond to those of the photomask. Contact angle measurement reveals that the micropatterning of the surface functional groups influences the magnitudes of surface free energy. A line pattern with high wetting contrast shows anisotropic water condensing behavior. Also, the patterned surface is used for the site-specific polymerization and site-specific adsorption of microparticles.     

Surface modification of medical PVC by remote oxygen plasma

Surface modification of medical PVC by remote oxygen plasma has been studied: surface structure and performance of treated material are analyzed by weight loss rate, contact angle measurement and XPS. With the increase of sample distance from the plasma source, weight loss rate drops, electrons and ions and etching action are restrained; and C=O groups are found in the treated PVC surface. The surface wettability of PVC film can be improved by remote low-temperature plasma and the radical reaction is intensified.     

催化动力学分析法测定痕量汞(II)的新方法研究:

本文应用多目标罚函数单纯形法对汞I(II)催化亚铁氰化钾与硫脲配体置换反应测定汞(II)的实验条件优化,并对其机理进行了较深入的研究。本法用于标准水样中痕量(II)的测定,得到满意结果。     

REMOVAL OF MERCURY FROM WATER USING POLYPYRROLE AND ITS COMPOSITES

One of the suitable methods for removing heavy metals from water is by using surface adsorption process. In this paper, the preparation of polypyrrole and its composites as adsorbents are discussed and the capability of separating mercury from water is investigated. The results indicated that the polypyrrole and its composites are able to remove mercury from aqueous media. Furthermore the adsorption percentage is related to the surface morphology, type of additives and its concentration.     

羰基过渡金属异核原子簇[(μ-SHgFe~Co(CO|)~9.(μ-CI)]~2的合成及晶体结构

本文报道了羰基异核原子簇, [(μ2-)HgFeCo(CO)~9(μ-CI)]~2的合成及晶体结构。化合物由(μ-S)HgFeCo(CO)~9(μ-CI)双聚而成。双聚分子具有c~2h对称性。在Fe-Fe, Fe-Co之间存在明显的金属-金属键。三核簇中的两个铁原子作为双齿配体与Hg原子配位。并通过HgS二聚形成双三角型簇合物。     

聚吡咯尿酸酶电极的生物电化学活性

聚吡咯尿酸酶电极具有快速的生牧电化学响应.在5.9×10^-6mol·dm^-3至1.5×10^-3mol·dm^-3的尿酸浓度范围内,酶电极的响应电流与底物浓度之间呈线性关系.固定酶的催化反应活化能为34.81kJ ·mol^-1.与可溶性的尿酸酶相比,聚吡咯尿酸酶电极的一些生物活性,如与溶液的pH和温度的关系,发生了有利的变化.     

STUDY ON PHOTO-INDUCED ORIENTATION OF A NOVEL PHOTO-ALIGNMENT FILM WITH SURFACE ENHANCED RAMAN SCATTERING （SERS） SPECTROSCOPY

Surface enhanced Raman scattering (SERS) spectroscopy was first utilized to study the photo-orientation behaviour of the photoreactive groups on a novel photo-alignment film surface and elucidate the generation mechanism of pretilt angle. The novel photo-alignment film was prepared by spin-coating a solution of ladderlike polysiloxane (LPS) bearing dual photoreactive group on an ITO surface and by irradiation with linear-polarized ultraviolet (LPUV) light. A Si-H terminal compound (M) containing an identical photosensitive part has been used to fabricate a model film for SERS investigation.     

Effect of Pt loading on the photocatalytic reactivity of titanium oxide thin films prepared by ion engineering techniques

Platinum-loaded titanium oxide thin-film photocatalysts were prepared by using an ionized cluster beam (ICB) deposition method and a RF magnetron sputtering (RF-MS) deposition method as dry processes. From the results of the photocatalytic oxidation of acetaldehyde with O₂ under UV light irradiation, small amounts of Pt loading (less than 10 nm film thickness) were found to dramatically enhance the photocatalytic reactivity. However, when TiO₂ thin films were loaded with relatively larger amounts of Pt (more than 30 nm as the film thickness), the photocatalytic reactivity became lower than for the pure TiO₂ thin films. Moreover, investigations of the ratio of Pt loaded onto the surface of the thin film catalysts by XPS measurements revealed that the small amounts of Pt loaded exist as very small clusters working to efficiently enhance the charge separation, whereas, large amounts of Pt covers the entire surface of the TiO₂ thin films, resulting in a decrease of the photocatalytic reactivity.     

钴(II)-丁二肟体系的吸附伏安法研究

本文对钴(II)与丁二肟配合物Co(II)A2在悬汞电极上的吸附伏安法作了研究。在-0.60～-0.90V(vs.SCE)Co(II)A2能在悬汞电极上很好地吸附,当电极向阴极方向扫描时,吸附在电极上的Co(II)A2分二步不可逆地还原到Co(O)(Hg)。本文导出了在低覆盖度下富集阶段电极表面吸附量的表达式,实验结果与理论推导相符.理论上分析了不可逆过程线性扫描吸附伏安法的灵敏度,影响灵敏度的主要因素是吸附富集时间,当富集120秒时,检测下限可达1x10[-9]M,此结论得到实验证实。     

硝酸银-氨-吡啶甲酸体系的阴极过程研究II. 交换电流和表面扩散步骤

本文报道了用不同方法测得的Ag-AgNO3-NH3-吡啶甲酸体系蜩交换电流值. 探讨了产较大差异的原因, 并得出银从上述体系中电积时, 在低过位区的过电位区的速率控制步骤是吸附离了的表面扩散.