微米级单分散共聚物微球的制备

用分散聚合法制备了苯乙烯 甲基丙烯酸甲酯微米级单分散共聚物微球 ,粒径为 5 4 μm .将分散聚合体系与乳液聚合体系进行了比较 ,并对共聚物微球的形貌、粒径分布及共聚情况进行了表征研究 .     

TiO2固定床光催化氧化头孢拉啶

 研究了抗生素头孢拉啶在负载型TiO2连续循环流动反应器中的降\r\n解，用红外和紫外光谱跟踪头孢拉啶的光催化降解过程．结果显示，在\r\n反应液流速4．5L／min，氧气流速1．6L／min，光照强度30W，反应温\r\n度28±2℃和反应时间120min的光催化氧化条件下，头孢拉啶能完全降\r\n解．光降解过程中头孢拉啶羧基的氧化比胺基容易．添加H2O2可以提高\r\n光催化氧化反应速率．光催化降解动力学研究表明，头孢拉啶的光催化\r\n氧化符合Langmuir－Hinshelwood一级动力学模型．     

石英砂中甲烷水合物稳定条件研究

采用不同粒径(160～200目、200～300目、300～400目、400～600目)细颗粒石英砂模拟自然界中沉积物实验合成甲烷水合物, 采用多步升温分解法测定了甲烷水合物的稳定温度-压力(p～T)条件. 结果发现细颗粒石英砂对甲烷水合物的稳定条件有明显影响, 温度最大下降1.5 K. 其中160～200目的石英砂是实验测试条件下石英砂对甲烷水合物稳定条件有无影响的分界目数. 每一种石英砂在不同的温度压力下甲烷水合物p-T数据点较为离散, 并且不同石英砂中p-T数据曲线出现交叉, 这与文献中采用规则的硅胶、玻璃球等测得的结果有所不同. 文献中测定的甲烷水合物p-T数据点温度相对于纯水中甲烷水合物p-T数据点温度向左偏移量相同.     

Electrochemical polymerization films for highly efficient electroluminescent devices and RGB color pixel

The electrochemical polymerization (EP) method to fabricate highly luminescent films and devices is rarely reported. It is typically believed that the organic light-emitting devices (OLEDs) made by EP method behave low performance because of the structural defects, doped electrolytes, and rough morphology in EP films. Here we present a new strategy to fabricate high-quality EP films including the special molecular design for EP precursors and the electrochemical control for EP processes. The resulting EP films exhibit high fluorescence, low doping levels, and smooth surface morphology. The efficiency of EP film devices arrive a level of >10 cd A^?1 (green-emission). Moreover, the full-color micropatterned EP films with sharp edge and high resolution have been achieved, demonstrating a new simple method for fabricating micropatterned luminescent polymers and devices compared with currently used techniques.     

Effect of composite supports on the methanation activity of Co-Mo-based sulphur-resistant catalysts

The effects of composite supports of CeO2-Al2O3,MgO-Al2O3,TiO2-Al2O3 or ZrO2-Al2O3 on the methanation activity of supported Co-Mo-based sulphur-resistant catalysts were investigated.The catalysts were further characterized by nitrogen adsorption measurement,X-ray diffraction and X-ray photoelectron spectroscopy.The catalyst of 5%CoO-15%MoO3 supported on CeO2-Al2O3,MgO-Al2O3,TiO2-Al2O3 or ZrO2-Al2O3 composite oxides,respectively,showed different catalytic performances of syngas methanation in the presence of hydrogen sulphide as compared with that of the 5%CoO-15%MoO3/Al2O3 catalyst.The Co-Mo/CeO2-Al2O3 catalyst shows the highest methanation activity among the tested catalysts.The enhanced methanation activity may be attributed to the improvement of the dispersion of active metal species and the inhibition of the formation of S6+.     

π‐Conjugated Microporous Polymer Films: Designed Synthesis,Conducting Properties,and Photoenergy Conversions

Conjugated microporous polymers are a unique class of polymers that combine extended π‐conjugation with inherent porosity. However, these polymers are synthesized through solution‐phase reactions to yield insoluble and unprocessable solids, which preclude not only the evaluation of their conducting properties but also the fabrication of thin films for device implementation. Here, we report a strategy for the synthesis of thin films of π‐conjugated microporous polymers by designing thiophene‐based electropolymerization at the solution–electrode interface. High‐quality films are prepared on a large area of various electrodes, the film thickness is controllable, and the films are used for device fabrication. These films are outstanding hole conductors and, upon incorporation of fullerenes into the pores, function as highly efficient photoactive layers for energy conversions. Our film strategy may boost the applications in photocatalysis, energy storage, and optoelectronics.     

含菲并咪唑基团的蓝色电致发光材料

菲并咪唑作为一类新型的蓝色荧光材料的构筑基元, 其以合适的禁带宽度、 较高的发光效率、 优异的光热稳定性和相对平衡的载流子注入和传输能力, 引起广泛关注. 发展性能优良的蓝光材料对有机电致发光器件的进一步应用十分重要. 本文综述了近年来基于菲并咪唑基团的蓝色电致发光材料的研究进展, 系统地介绍了菲并咪唑基团的结构特征以及各类衍生物的器件性能, 展望了这类化合物在电致发光领域的应用前景.     

Highly Efficient Near‐Infrared Organic Light‐Emitting Diode Based on a Butterfly‐Shaped Donor–Acceptor Chromophore with Strong Solid‐State Fluorescence and a Large Proportion of Radiative Excitons

The development of near‐infrared (NIR) organic light‐emitting diodes (OLEDs) is of growing interest. Donor–acceptor (D–A) chromophores have served as an important class of NIR materials for NIR OLED applications. However, the external quantum efficiencies (EQEs) of NIR OLEDs based on conventional D–A chromophores are typically below 1 %. Reported herein is a butterfly‐shaped D–A compound, PTZ‐BZP. A PTZ‐BZP film displayed strong NIR fluorescence with an emission peak at 700 nm, and the corresponding quantum efficiency reached 16 %. Remarkably, the EQE of the NIR OLED based on PTZ‐BZP was 1.54 %, and a low efficiency roll‐off was observed, as well as a high radiative exciton ratio of 48 %, which breaks through the limit of 25 % in conventional fluorescent OLEDs. Experimental and theoretical investigations were carried out to understand the excited‐state properties of PTZ‐BZP.     

矩形光栅的衍射特性

本文采用严格的一阶耦合波理论,对矩形光栅的衍射特性进行了分析,给出了TE模和TM模同时具有很高的衍射效率时的光栅结构。计算表明:只有在满足Bragg衍射条件时,TE模和TM模才能达到峰值衍射效率。为了验证理论与编制程序的正确性,将计算结果与已有的资料进行了比较.     

从润湿热研究HZSM-5分子筛与不同液体相互作用的特点

ZSM-5是一类新型分子筛,共物理化学性能的研究引起了广泛的兴趣。本工作测定了高温脱气的HZSM-5分子筛在正己烷、正庚烷,正癸烷、正十二烷,环己烷、苯、甲苯,邻、间、对二甲苯,甲醇和乙醇中的润湿热。