液/液界面新溶剂体系的电化学研究

用循环伏安法测定了离子在水-异硫氰酸烯丙脂(AIT)体系中的标准转移Gibbs能△_o~w G_(tr,i)~0。对含有AIT的混合溶剂的研究, 发现了一系列电位窗比较宽的水/有机溶剂体系, 讨论了溶剂效应对△_o~w G_(tr,i)~0的影响。     

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。     

迈克尔逊干涉仪的干涉花样及调节

本较详细地讨论了迈克迩干涉仪在各种不同条件下产生的干涉条纹的性质及干涉花样。     

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.     

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．     

高效液相色谱-电化学阵列检测器检测10种磺胺药物在鸡肉中的残留

建立了一步有机溶剂提取、HPLC分离、多孔石墨电极阵列检测器检测10种磺胺类药物在鸡肉中残留量的方法。采用乙腈-氯仿混合液(乙腈：氯仿=10：1)提取，10种磺胺药物的提取收率均大于50％；研究了磺胺类药物在多孔石墨电极上的氧化还原特征，确定检测电势为455，560，630，670和710mV；优化了HPLC分离条件，Hypersil BDS C-18色谱柱，pH5、30mmoL／L磷酸二氢钠、8．5％-37．5％乙腈(V/V)线性梯度洗脱，40min内实现10种磺胺药物的基线分离，鸡肉中提取的杂质不干扰样品分离；方法的检出限(S/N=3)为磺胺二甲异喔唑(SIA)40μg／kg及磺胺(SA)、磺胺嘧啶(SDZ)、磺胺甲基嘧啶(SMR)、磺胺二甲基嘧啶(SMZ)、磺胺吡啶(SPD)、磺胺噻唑(STZ)、磺胺甲噻二唑(SMTZ)、磺胺氯哒嗪(SCP)和磺胺甲基异喔唑(SMX)等分别为20μg／kg，在0．1—2．0mg/L浓度范围内各磺胺类药物与其响应信号呈现良好的线性关系，相关系数(r)均大于0．9978；电极再生方法简单，可实现在线清洗，适用于食用畜禽产品中磺胺类药物残留量的分析。     

New ladder‐type conjugated polymer containing carbazole and fluorene units in backbone: Synthesis,optical, and electrochemistry properties

This article describes the synthesis and characterization of a new ladder‐type poly (p‐phenylene) (LPFC) containing alkylcarbazole and dialkylfluorene units in backbone, and its optical and electrochemical properties as well as its light‐emitting device performance. LPFC shows the well‐defined structure, high molecular weights, excellent thermal stability, and good solubility in common organic solvents. And it also shows strongly blue emission (λ_max = 465 nm) with quantum efficiency of 70% in solution, while its solid emission (λ_max = 470 nm) is almost the same as its solution. Electrochemical studies show that the highest occupied molecular orbital (HOMO) energy levels of LPFC is up to 5.29 eV, which is significantly higher than that of LPPP without carbazole in backbone, indicating an enhanced ability of hole injection from anodes. Furthermore, the single layer light‐emitting device using LPFC as the active layer shows blue emission (λ_max = 470 nm) with maximum luminescence of ～ 2000 cd/m² and maximum luminance efficiency of 0.43 cd/A. The attractive properties exhibited from new ladder‐type polymer establish LPFC as a good candidate for the potential application as transporting and emitting layer in polymeric light emitting diodes. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 3120–3127, 2008     

等离子体聚合物发光性质的研究

通过等离子体聚合合成了发光聚合物,反应条件的改变可使聚合物的荧光峰值从415nm变化到550nm。对聚合物的荧光性质进行了讨论,且制备了电致发光器件LED(A1/聚萘/ITO),实现了其电致发光。结果表明等离子体聚合物的电致发光与光致发光产生的机理基本相同,都是由聚合物中的多个生色团产生的。     

Average life of oxygen vacancies of quartz in sediments

Average life of oxygen vacancies of quartz in sediments is estimated by using the ESR (electron spin resonance) signals of E’ centers from the thermal activation technique. The experimental results show that the second-order kinetics equation is more applicable to the life estimation compared with the first order equation. The average life of oxygen vacancies of quartz from 4895 to 4908 deep sediments in the Tarim Basin is about 10¹⁸ a at 27°C.     

Rigidity of Asymptotically Hyperbolic Manifolds

In this paper, we prove a rigidity theorem of asymptotically hyperbolic manifolds only under the assumptions on curvature. Its proof is based on analyzing asymptotic structures of such manifolds at infinity and a volume comparison theorem.The first author’s research is partially supported by NSF grant of China.The second author’s research is partially supported by an NSF grant and a Simon fund.