亚铁氰化钾、铁氰化钾和双偶极半菁衍生物静电自组装膜的研究

通过交替沉积K4[Fe(CN)6](或K3[Fe(CN)6])和双偶极半菁(Me2NC6H4CH CHC5H4N CH2C6H4—C6H4—CH2— NC5H4—CH CH—C6H4—NMe2)的氯化物,制备了2种无机有机杂化自组装膜.通过紫外可见吸收光谱、偏振可见吸收光谱和循环伏安图对薄膜进行了表征.     

硅烷自组装膜对碳钢表面的改性及缓蚀性能研究

采用分子自组装技术在碳钢表面制备了3-巯基丙基三甲氧基硅烷自组装膜(MPTS-SAM).通过原子力显微镜(AFM)观察了碳钢表面成膜过程,并对其表面粗糙度进行了分析;利用动电位极化曲线研究了该自组装膜对碳钢的缓蚀性能.结果显示:该自组装膜对碳钢具有良好的缓蚀性能,且经MPTS自组装分子膜改性处理的碳钢表面较平滑,粗糙度明显降低;硅烷分子的水解程度对自组装有一定影响,且随着组装时间的延长,自组装膜更完整,对碳钢的缓蚀效率更高.     

热镀锌板上γ-APT硅烷自组装膜的制备及相容性

采用交流阻抗谱和接触角的方法研究了γ-APT硅烷的单分子自组装膜在热镀锌钢板表面的成膜过程,以及γ-APT硅烷自组装膜和γ-GPT硅烷的相容性.实验成功制备硅烷单分子自组装膜.组装开始时硅烷分子水解生成硅醇键的一端快速吸附在锌的表面并形成了Si—O—Zn键,硅烷分子之间的硅醇键随即脱水形成Si—O—Si键,从而自组装成为有序、规律排布的单分子自组装膜,组装10 h后膜的完整性最好,随后形成连续性较差的混杂膜.经过10 h组装后的γ-APT硅烷自组装膜与γ-GPT硅烷具有良好的相容性.     

二维单分子膜与三维体系的对应关系

二维单分子膜体系与三维体系之间在物理状态和热力学量方面存在着一一对应的关系 ,由此可将研究三维体系热力学函数的方法直接应用于二维单分子膜体系     

Synthesis of self-assembled needle-shaped calcium carbonate superstructures

Novel self-assembled calcium carbonate (CaCO₃) crystals exhibiting the morphology of well-defined needles were synthesized by a simple precipitation reaction in the presence of octadecyl dihydrogen phosphate (ODP) as a crystal additive. The CaCO₃ obtained by this method is hydrophobic, making it likely to be used widely in industry. The resulting products were characterized by powder X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and contact angle experiments. The results indicated that ODP plays an important role in determining the structure, morphology and hydrophobicity of CaCO₃ crystals.     

A simulation study on the thermal and wetting behavior of alkane thiol SAM on gold (111) surface

Molecular dynamics simulations have been performed to investigate the structural,thermal and wetting properties of self-assembled monolayer(SAM) of alkane thiol on gold surface.The specific heat capacity of the gold SAM surface was found to linearly increase with the temperature in the range 100–300 K.It was found to drop down at 400 K and this decrease might be attributed to the disorder of the SAM chains.Hydration of gold SAM surface for two different terminal groups,namely methyl(hydrophobic),and hydroxy(hydrophilic) was studied at room temperature.The difference in their wetting behavior and the structure of their interfacial water were examined from the estimation of the z density profile,radial distribution function,hydrogen bonds and orientation of water dipoles in the interfacial region.The present simulation results suggest that the wetting behavior of the gold SAM surface can be modified by altering the terminal functional group of the SAM chains.     

SAM修饰金电极的电化学和光电化学研究

综述了自组装单分子膜（ＳＡＭ）修饰金电的修饰方法及其在电催化、光电化学领域的研究进展等内容，探讨了ＳＡＭ修饰金电极的应用前景和该方法进一步的发展方向。     

基于网络的信息管理系统的发展

基于我们社会网络建设的快速发展和网络应用领域的快速扩大，信息管理系统也向着网络化发展的现状，本文着重分析了单层数据库系统和多层数据库系统以及多层数据库中Clients/Server开发模式和MIDAS技术的区别和应用。     

抗坏血酸在半胱氨酸自组装膜上的电化学行为及应用

半胱氨酸自组装修饰金修饰电极对抗坏血酸(Vc)具有很高的电催化氧化活性.在pH 2.0的0.1 mol/L缓冲溶液中,可得到一对准可逆的氧化还原峰.电极反应受扩散控制.氧化峰电流与抗坏血酸浓度在5.0×10-6～1.1×10-3 mol/L范围内成线性关系,检测限为1.0×10-6 mol/L.该分析方法应用于果汁中的抗坏血酸分析,结果令人满意.     

Self-assembly of N-3-γ-pyridyl Aza[60]fulleroid on Au(111)

Self-assembled monolayers of novel C₆₀ derivative, N-3-γ-pyridyl Aza[60]fulleroid (C₆₀Py), on Au(111) were studied by a scanning tunneling microscope under ultrahigh vacuum (UHV). C₆₀Py molecules were assembled on Au (111) via pyridyl nitrogen-Au interaction. The sole assembly of C₆₀Py molecules on Au (111) only exhibited randoml aggregation of C₆₀Py even the films were annealed at 50 and 105°C. By co-assembling with benzyl mercaptan (BM), the C₆₀PyBM films showed highly dense aggregation, but C₆₀Py assemblies still had disordered structure. After the co-assembled C₆₀Py-BM films were annealed at 50°C, BM molecules were partially desorbed, but the assembly of C₆₀Py remained without obvious change. After the co-assembled C₆₀Py-BM films were further annealed at 105°C, the C₆₀Py monolayers with ordered structure were obtained, while the BM molecules were nearly thoroughly desorbed from the surface. Here, the BM molecules play a key role as a surfactant in the formation of the ordered C₆₀Py monolayer.