分子沉积聚合物膜的制备及其摩擦学性能研究

以聚对磺酸钠苯乙烯(PSS)为聚阴离子、聚烯丙基氯化氨(PAH)为聚阳离子交替沉积制备了多层聚合物纳米复合膜,用热分析仪考察了这两种体相聚合物的热稳定性,采用紫外-可见光谱仪、椭圆偏振光测厚仪、接触角测量仪等分析了复合膜的性能,用DF-PM型动静摩擦系数精密测定装置考察了其摩擦学性能.结果发现,所制备的聚合物复合膜具有一定的减摩作用,原因是单晶硅表面沉积聚合物超薄膜可以降低表面的粘着力,对硅表面具有微观修饰作用,从而降低其同钢对摩时的摩擦系数;单晶硅表面分子沉积聚合物纳米复合膜的摩擦学特性同超薄膜的层数相关,沉积层数较多的超薄膜的耐磨寿命较长,并因加热处理而得到明显改善.     

有机小分子染料和聚阳离子分子超薄膜的制备及其摩擦学性能研究

制备了以有机小分子染料酸性红 1 8为阴离子、以聚烯丙基氯化铵和聚乙烯亚胺为聚阳离子的分子沉积膜 ,用紫外可见分光光度计、接触角测定仪和椭圆偏振光测厚仪对所制备的超薄膜进行了表征 .用DF PM型动 静摩擦系数精密测定装置考察了超薄膜的摩擦学性能 ,采用扫描电子显微镜对薄膜的磨痕表面进行了观察 .结果表明 ,所制备的超薄复合沉积膜具有良好的减摩和耐磨性能     

聚乙烯亚胺和聚对磺酸钠苯乙烯分子沉积超薄膜的制备及其摩擦学性能研究

制备了以聚乙烯亚胺为聚阳离子,聚对磺酸钠苯乙烯为聚阴离子的分子沉积膜,用紫外-可见分光光度计、接触角测定仪和椭圆偏振光测厚仪对所制备的超薄膜进行了表征,用DF-PM型动静摩擦系数精密测定装置考察了超薄膜的摩擦学性能,并采用扫描电子显微镜对薄膜磨痕表面形貌进行观察.结果表明,所制备的超薄复合沉积膜具有良好的耐磨性能;随着相对湿度增大,摩擦系数减小;复合沉积膜的磨损机理主要为粘着磨损.     

Fabrication and Catalytic Properties of Films Based on Metal Ion-ligand Interaction between K_2PdCl_4 and 3-Amino-3-(4-pyridinyl)-propionitrile

This work presents a highly active and reusable heterogeneous film catalytic assembly for hydrogenation reduction of aromatic nitro compounds. The multilayer structures of PEI-(K2PdCl4-P1)n-film(PEI = polyethylenmine, P1 = 3-amino-3-(4-pyridinyl)-propionitrile) bound to quartz slides were fabricated by layer-by-layer(LbL) self-assembly method. Various characterization techniques including X-ray photoelectron spectroscopy(XPS), inductively coupled plasma OES spectrometer(ICP), UV-vis spectroscopy and atomic force microscopy(AFM) were employed to reveal the growth process of the resulting LbL multilayers in detail. Subsequent in situ reduction by H2 produced Pd nanoparticles embedded in such films were used as catalyst for the hydrogenation of nitroarenes. The catalytic performance test shows that the thin film catalyst can be applied to the hydrogenation reaction of various substituted nitroaromatics, and exhibits good catalytic activity and good catalyst stability. It is worth mentioning that our catalytic films can be easily removed from the reaction system in any time during the reaction, and the catalytic activity could be fully recovered when reused directly in another catalytic cycle for five times.     

Syntheses and Crystal Structures of Three Novel Amino-acid-containing Polyoxomolybdosilicates

1 INTRODUCTION Polyoxometalates as metal-oxygen cluster ions have received a great deal of research due to their potential applications in catalysis, medicine and ma- terials science[1]. The modification of organic groups to the surface of polyoxoanions gives POMs more interesting character, and many derivatives of poly- oxoanions with organic ligands have been studied[2]. Particularly the potential applications of polyoxo- metalate as drugs in anti-viral and anti-AIDS have attracted t…     

阳离子镍基MOF自组装CdS/PFC-8催化剂用于可见光光催化选择性苯甲醇氧化耦合产氢（英文）

可见光驱动的光催化制氢与有机氧化合成相结合由于其环境友好性和可持续性而极具吸引力,它可以在温和的条件下同时产生清洁的氢气燃料和高价值化学品,而无需牺牲剂。半导体材料和金属有机骨架(MOFs)材料由于其性能和优势,在光催化领域得到了广泛的应用。在这项工作中,我们通过静电自组装成功合成了一种名为Cd S/PFC-8的新型有效催化剂。其中,PFC-8作为镍基金属有机骨架,Cd S/PFC-8复合材料作为无贵金属催化剂,在可见光下具有优异的光催化制氢和苯甲醇氧化性能。对Cd S/PFC-8复合材料进行了一系列催化表征。X射线衍射(XRD)和扫描电子显微镜(SEM)结果表明了Cd S/PFC-8复合材料的成功合成。X射线光电子能谱(XPS)表明了Cd S纳米棒与PFC-8之间存在一定的界面相互作用。通过紫外-可见漫反射光谱(DRS)、光致发光光谱(PL)和电化学测试对光电性能进行了表征,表明Cd S/PFC-8复合材料的可见光响应和光催化可行性。对不同催化剂的光催化实验结果进行比较,在可见光下,Cd S/PFC-8复合材料将H2的产生与苯甲醇的选择性氧化耦合,表现出显著的H2产率3376μmol...     

分子沉积聚合物膜的制备及其摩擦学性能研究

以聚对磺酸钠苯乙烯 (PSS)为聚阴离子、聚烯丙基氯化氨 (PAH)为聚阳离子交替沉积制备了多层聚合物纳米复合膜 ,用热分析仪考察了这两种体相聚合物的热稳定性 ,采用紫外 -可见光谱仪、椭圆偏振光测厚仪、接触角测量仪等分析了复合膜的性能 ,用DF -PM型动静摩擦系数精密测定装置考察了其摩擦学性能 .结果发现 ,所制备的聚合物复合膜具有一定的减摩作用 ,原因是单晶硅表面沉积聚合物超薄膜可以降低表面的粘着力 ,对硅表面具有微观修饰作用 ,从而降低其同钢对摩时的摩擦系数 ;单晶硅表面分子沉积聚合物纳米复合膜的摩擦学特性同超薄膜的层数相关 ,沉积层数较多的超薄膜的耐磨寿命较长 ,并因加热处理而得到明显改善 .     

联苯胺盐酸盐和聚阴离子有机超薄膜的制备和表征

有机薄膜具有良好的机械和化学稳定性、组成和厚度可控等优点 ,近年来被广泛接受[1 ,2 ] 。用自组装形成的多层复合膜已在渗透膜、导电膜、生物传感器、表面修饰改性、抗静电涂层、非线形光学器件等领域获得了广泛的研究[3,4] 。本文制备了以聚对磺酸钠苯乙烯和联苯胺盐酸盐的分子沉积膜。1　实验部分1 1　试剂与仪器聚对磺酸钠苯乙烯 (ＰＳＳ ,ＭＷ =70 0 0 0 ) ,4,4′—二氨基联苯胺盐酸盐 ,3 氨基丙基三乙氧基硅烷 (ＡＰＳ) ,未进一步处理。ＨＰ845 3型紫外可见光谱分析仪 ,日本协和科学株式会社产ＣＡ -Ａ型接触角测量仪 ,Ｌ1 1 6-Ｅ型…     

Hydrothermal Synthesis,Crystal Structure and Magnetic Property of a Novel Mixed Valence Decatungstate： [Cu（2,2＇-bipy）2]2Na2W6^VW4·VIO30·2H2O

A novel Cu（II）-2,2＇-bipy-supported （bipy = bipyridine） mixed valence decatungstate, [Cu（2,2＇-bipy）2]2Na2W6^VW4^VIO30·2H2O 1, has been synthesized and structurally characterized by X-ray analysis. The crystal of 1 is of triclinic, space group P1^- with a= 10.9393（10）, b = 12.0492（2）, c = 12.3783（2）A, a = 80.631（10）, β= 70.226（10）, γ= 72.329（9）^o, V = 1459.64（4）A^3, Z = 1, Dc = 3.582 g/cm^3, F（000） = 1404, R = 0.0553 and wR = 0.1242 for 4607 observed reflections （I 〉 2σ（I））. The EPR spectrum of 1 indicates that its unpaired electrons are placed in the dx2-y2 orbital of the ground state of Cun. Furthermore, compound 1 shows an antiferromagnetic interaction.     

铜(Ⅱ)催化邻甲氧基酚的氧化自聚反应研究与应用

研究了在硼酸 -氢氧化钠缓冲介质中 ,痕量 Cu( )催化邻甲氧基酚的氧化自聚反应的最佳条件、动力学参数及反应机理 ,建立了催化动力学光度法测定痕量铜的新方法。方法的线性范围为 0～ 1 80 ng/2 5m L,检出限为 4.9× 1 0 -11g/m L。已应用于铅锌矿废渣中铜的测定