染料敏化太阳能电池中大孔TiO2薄膜电极的制备及应用

采用溶胶-凝胶水热法制备了TiO₂纳晶薄膜电极，晶型为锐钛矿型。为了提高电极的光电性能，利用聚苯乙烯小球做造孔剂，制备了含有大孔隙的TiO₂纳晶薄膜电极，孔径约为200 nm，该电极具有较好的光漫反射性能，更重要的是球形大孔的存在，提高了凝胶电解质在TiO₂薄膜电极中的渗透和I₃^-离子的扩散性能，与不含大孔的TiO₂电极相比，电池的短路光电流提高约2 mA·cm^-2，光电转换效率提高0.6%。     

r阶二进求导极大算子的有界性

本文研究了r阶二进求导极大算子的有界性.利用Dirichlet核的性质证明了此极大算子在一维和d维情况下都不是从Hardy空间Hp到Hardy空间Hp有界的,其中0相似文献   

W/O/W多重乳液中水传递的控制

建立了简化的W/O/W(水/油/水)多重乳液乳珠模型——统计平均半径模型, 预测出当W/O/W多重乳液内水相水滴之间以及内外水相之间均达到水传递平衡时的内外水相中盐的浓度, 从而实现对水传递的控制, 以维持W/O/W多重乳液的稳定. 按理论预测制备出了不同稳定态的W/O/W多重乳液, 利用差分扫描量热仪(DSC)检测了多重乳液中水的传递过程, 确定体系在实验状态下的稳定程度, 实验结果与理论预测基本吻合.     

B→（J/ψ,η_c）K decays in the perturbative QCD approach

In this paper,we calculated the B →（J/ψ,ηc） K decays in the perturbative QCD（pQCD） factorization approach with the inclusion of the partial next-to-leading order（NLO） contributions. With the inclusion of the significant enhancement from the NLO vertex corrections,the NLO pQCD predictions for the branching ratios agree with the data within 2σ errors：Br（B0 → J/ψK0） = 5.2-＋32..58×10-4,Br（B＋ → J/ψK＋） = 5.6-＋32..79×10-4,Br（B0 →ηcK0） = 5.5-＋22..30 × 10-4,Br（B＋ →ηcK＋） = 5.9-＋22..51 × 10-4.     

Effects of Langmuir-Blodgett Film as Hole Transport Layer on Organic Electroluminescent Device Performance

Three types of organic electroluminescence(EL) cells with organic material FY as the EL-emitting layer and a copper phthalocyanine (CuPc) as the hole transport layer which were sandwiched between indium/tinoxde(ITO) and aluminum electrode have been fabricated by vacuum-vapor and Langmuir-Blodgett (LB) deposition:(a) ITO/FY/Al;(b)ITO/CuPc/FY/Al;(c) ITO/CuPc(LB)/FY/Al. It was found for the first time that the cell with the LB film as the hole transport layer has the highest luminescent intensity at the same bias-voltage. These results are attributed to the order orientation of the CuPc molecule in the layer of LB film.     

Effect of Alkali Treatment on the Structure and Catalytic Properties of ZSM-5 Zeolite

Catalytic properties of ZSM-5 zeolite samples pretreated with NaOH solution have been investigated. The samples are characterized by XRD, SEM, chemical analysis, and N2 adsorption.The results indicate that mesopores are created in ZSM-5 crystals under alkali treatment without change the microporous structure and acidic strength of the zeolite, but the crystallinity is greatly decreased under severe treatment. IR indicates that the concentration of silanol is greatly enriched by alkali treatment. The etherification activities of ZSM-5 zeolites are greatly increased byalkali-treatment. The noticeably improved catalytic activity of treated samples is ascribed to the formation of mesopores and greatly enriched silanol group.     

双帽Keggin型杂多阴离子[PM12O40(VO)2]n-(M=Mo,n=5; M=V,n=9)的离散变分方法研究

使用密度泛函理论的离散变分方法(DFT-DVM)研究了双帽Keggin型杂多阴离子[PM₁₂O₄₀(VO)₂]^n--(M=Mo,n=5; M=V,n=9),即[PMo₁₂O₄₀(VO)₂]^5- (a)和[PV₁₂O₄₀(VO)₂]^9- (b)的电子结构,讨论了双帽的形成对Keggin型杂多阴离子的电子结构和催化性质的影响,并与其Keggin型杂多阴离子(PM₁₂O₄₀)_n-(M=Mo,n=3; M=V,n=15)的计算结果进行了对比分析,计算结果表明,双帽的形成对Keggin型杂多阴离子的电子结构产生了很大的影响,因而它们在催化活性上可能会表现出较大的差异.     

新型吡啶衍生物及其Tb（Ⅲ）配合物的合成与光谱性质研究

有机配体与稀土离子配位形成的配合物,在生物、医学、功能材料、光、电、磁等方面已有广泛的应用[1-6].1993年Kido J等[7]实现了稀土-β-二酮螯合物的电致发光, 为有机电致发光器件(OLED) 开辟了一个新的研究方向.     

低密度聚乙烯的接枝改性

低密度聚乙烯的接枝改性;低密度聚乙烯;甲基丙烯酸缩水甘油酯;非等温结晶Avrami方程     

流动注射-分光光度法同时测定食品中水溶性总糖和还原糖

食品中水溶性总糖经1mol.L-1盐酸溶液水解生成还原糖,对羟基苯甲酸酰肼与生成的还原糖显色,在波长420nm处有最大吸收峰,据此提出了一种流动注射-分光光度法测定食品中水溶性总糖和还原糖含量的方法。方法的线性范围为50.0～800mg.L-1,还原糖的检出限为5.32mg.L-1,总糖的检出限为2.71mg.L-1。方法用于食品中还原糖和水溶性总糖的测定,测得方法的回收率在98.0%～101%之间,测定值的相对标准偏差(n=6)在1.1%～1.5%之间。