电解等离子体法制备Al2O3陶瓷层及其特性研究

利用电弧喷铝并重熔后进行电解等离子体处理(EPP)的方法在Q235钢基体上制备出呈冶金结 合的Al₂O₃陶瓷层.利用XRD,SEM和EDS等手段对陶瓷层的成分和显 微组织进行了分析, 测定了陶瓷层的耐蚀性能和耐磨性能.实验结果表明,陶瓷层主要由α-Al₂O3,γ-Al₂O₃,θ-Al₂O₃以及一 些非晶相组成,组织致密,耐蚀性能和耐磨性能良好.关键词：电解等离子体处理陶瓷层复合技术生长机理     

Direct evidence for interactions between acidic functional groups and silanols in cubic mesoporous organosilicas

A facile one-pot synthesis route for preparation of a well-ordered cubic mesoporous silica SBA-1 functionalized with -COOH functional groups is reported for the first time. The results of 29Si{1H} HETCOR NMR provide direct evidence for the interactions between the carboxylic acid and silanol groups in carboxylic acid functionalized SBA-1. Density functional theory calculations indicate that the T3-Q4-Q3 motif is the favorable framework composition in the material and the carboxylic protons in the T3 species can form hydrogen bonds with the spatially proximate oxygen atom in the Q3 Si-OH species.     

p-Quaterphenyls laterally substituted with a dimesitylboryl group: a promising class of solid-state blue emitters

A new family of p-quaterphenyls 1-6 laterally substituted with a bulky electron-accepting dimesitylboryl group has been designed and synthesized. These compounds were characterized by X-ray crystallography, UV-vis and fluorescence spectroscopy, and DFT calculations as well as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and cyclic voltammetry (CV). X-ray single-crystal analysis revealed that the p-quaterphenyl main chain framework exhibits a twisted structure due to the steric effect of the lateral boryl group, and the intermolecular interactions are effectively suppressed in the solid state. Despite the significantly twisted main-chain structure, these molecules still display efficient intramolecular charge-transfer emissions with large Stokes shifts. An intriguing finding is that all these molecules show bright fluorescence with good to excellent quantum yields in the blue region in the solid state. In addition, the two representative p-quaterphenyls 3 and 4 containing both the electron-accepting boryl group and the electron-donating carbazolyl (3) or diphenylamino group (4) possess high thermal stability and good oxidation-reduction reversibility, which together with their excellent solid-state fluorescence efficiency make them promising bipolar transporting blue emitters.     

研究生高等有机化学双语教学课程体系改革与实践

针对双语教学特点及传统课堂灌输教学的不足,将研究生高等有机化学双语课程改革为课程教学、英语课堂讨论、翻转课堂、自学和习题训练、作业与考核5个环节相结合的教学体系。结合教学实践,着力训练学生自主学习、研究性学习、探究性学习的能力,着重考查学生对高等有机化学基本理论与方法的掌握与应用程度。在课程中营造数字化、信息化、国际化的教学环境,最终达到培育具有国际化视野、基础知识扎实、能力全面、创新素养好的人才的目的。     

内嵌镧原子的磁性硅纳米线的第一性原理研究

基于密度泛函理论,系统研究了由两个La@Si_(16)组装而成的高度稳定的管状二聚体La_2@Si_(32)团簇.电子结构分析显示,内嵌La原子诱导的类sp~2杂化对于提高管状Si_(32)的稳定性至关重要.Mülliken布局分析显示,La_2@Si_(32)的总磁矩为2 μ_B,主要来源于两个La原子和第三、第六层的八个Si原子;电荷是由Si原子转移到了La原子上.此外,通过连接一系列La_2@Si_(32)单体而获得了一类组装的硅纳米线La@SiNW,研究结果显示La@SiNW具有金属导电特性,其总磁矩为2 μ_B.上述特征暗示具有磁性的La_2@Si_(32)和La@SiNW可能在自旋电子器件和高密度磁记录材料方面具有潜在的应用前景.     

可乳化共聚单体AGES用于无皂乳液聚合的研究

合成了一种新型可共聚单体烯烃基甘油醚磺酸盐(AGES),不仅含有具有反应活性的烯键,而且带有起乳化作用的磺酸离子基团及羟基,可用于MMA/BA无皂乳液聚合体系。对乳胶粒大小、乳液的流体力学行为及共聚物的动态力学性能进行了研究。实验结果表明:通过AGES的引入,可获得直径为0.5μm左右的分布均匀的乳胶粒,乳液含固量高(60%),粘度低,是稳定的塑性非牛顿流体乳液,共聚物为典型的无规共聚。     

金属管件内壁栅极增强等离子体源离子注入的轴向特性研究

栅极增强等离子体源离子注入(GEPSII)一种新的金属管件内壁处理方法,该方法能够均匀地对金属管件内壁进行离子注入,并且能够生成二元金属化合物.在金属管件内轴向放置三块45号钢样品,利用GEPSII方法在金属管件内壁成功生长金黄色氮化钛(TiN)薄膜.结构分析显示TiN主要沿(111)和(200)晶面生长,深度分析显示膜的厚度大约二十几纳米,膜质地均匀且在基底有一定的嵌入深度.电化学腐蚀、硬度、磨擦学分析表明TiN薄膜很好地改善了45号钢的表面性能,并且表现出很高的轴向均匀性.关键词：等离子体源离子注入内表面氮化钛     

An aggregation-induced emissive chromophore as a ratiometric fluorescent sensor for cyanide in aqueous media

A para-terphenyl derivative containing a lateral diphenylamino group and two terminal dicyanovinyl groups has been designed and synthesized. This compound displays aggregation-induced emission characteristics and thus shows intense intramolecular charge transfer fluorescence even in the condensed state, including in the aggregates formed in an aqueous solvent system consisting of greater than 99% water and in the solid state. The addition of cyanide to its aggregates in aqueous media induces a large blue shift in fluorescence, enabling ratiometric fluorescence sensing of cyanide anions. In addition, its prompt fluorescence responses to cyanide anions were also observed even in the solid state.     

Removal of NO Molecules by a Novel Atmospheric Pressure Plasma Apparatus

A novel atmospheric pressure plasma apparatus （APPA） is designed with a liquid electrode, and its discharging characteristics are studied. Relatively uniform and intense discharge can be realized in the APPA system. An experimental study on removal of NO molecules is carried out by using the APPA, and more than 95.5% of NO is decomposed when the NO initial concentration is lower than 400ppm. Removal of NO efficiency increases rapidly with the increasing discharge power. Compared with the absence of O2, more NO2 is generated with the increase of O2 concentration. However, most of the NO molecules are decomposed to N2 and O2 directly, when O2 concentration changes from 0 to 1.1 vol%.     

Synthesis and solid-state NMR characterization of cubic mesoporous silica SBA-1 functionalized with sulfonic acid groups

Well-ordered cubic mesoporous silicas SBA-1 functionalized with sulfonic acid groups have been synthesized through in situ oxidation of mercaptopropyl groups with H(2)O(2) via co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) templated by cetyltriethylammonium bromide (CTEABr) under strong acidic conditions. Various synthesis parameters such as the amounts of H(2)O(2) and MPTMS on the structural ordering of the resultant materials were systematically investigated. The materials thus obtained were characterized by a variety of techniques including powder X-ray diffraction (XRD), multinuclear solid-state Nuclear Magnetic Resonance (NMR) spectroscopy, (29)Si{(1)H} 2D HETCOR (heteronuclear correlation) NMR spectroscopy, thermogravimetric analysis (TGA), and nitrogen sorption measurements. By using (13)C CPMAS NMR technique, the status of the incorporated thiol groups and their transformation to sulfonic acid groups can be monitored and, as an extension, to define the optimum conditions to be used for the oxidation reaction to be quantitative. In particular, (29)Si{(1)H} 2D HETCOR NMR revealed that the protons in sulfonic acid groups are in close proximity to the silanol Q(3) species, but not close enough to form a hydrogen bond.