CdSe纳米线阵列的制备及其表征(英)

通过在含有SeSO₃^2-和Cd²⁺的室温水溶液中，用模板-电沉积法在纳米孔阵列阳极氧化铝膜(AAM)模板中制备了高有序性的CdSe纳米线阵列，并对其形貌、结构和组分进行了表征。扫描电子显微镜(SEM)和透射电子显微镜(TEM)结果表明，纳米线阵列中的CdSe纳米线具有相同的长度和直径，分别对应于使用的AAM模板的厚度和孔径；X-射线衍射(XRD)和X-射线能谱(EDAX)结果表明，CdSe纳米线中Cd和Se的化学组成非常接近于1∶1，其结构为立方CdSe。另外，对模板-电沉积法制备CdSe纳米线的机理进行了讨论。     

Characterization of Carbon Film Electrodes for Electroanalysis by Electrochemical Impedance

The interfacial behavior of electrodes fabricated from carbon film resistors of 2 and 20 Ω in supporting electrolyte solutions of varying pH used in electroanalytical experiments has been characterized by electrochemical impedance spectroscopy with complementary cyclic voltammetric experiments. Equivalent circuits are proposed to fit the experimental data and the influence of electrode pretreatment has also been investigated.     

Complete Oxidation of Methane over Palladium Supported on Alumina Modified with Calcium,Lanthanum,and Cerium Ions

The activity and thermal stability of Pd/Al_2O_3 and Pd/(Al_2O_3 MO_x)(M=Ca,La,Ce) palladium catalysts in the reaction of complete oxidation of methane are presented in this study.The catalyst supports were prepared by sol-gel method and they were dried either conventionally or with supercritical carbon dioxide.Then they were impregnated with palladium nitrate solution.The catalysts with unmodified alumina had a high surface area.The activity and thermal stability of the alumina- supported catalyst was also very high.The introduction of calcium,lanthanum,or cerium oxide into alumina support caused a decrease of the surface area in the way dependent on the support precursor drying method.These modifiers decreased the activity of palladium catalysts,and they required higher temperatures for the complete oxidation of methane than unmodified Pd/Al_2O_3.The improvement of the palladium activity by lanthanum and cerium support modifier was observed only at low temperatures of the reaction.     

盐酸氨溴索在碳糊电极上阳极伏安法的研究

在０．５ ｍｏｌ／Ｌ Ｈ２ＳＯ４底液中，用碳糊电极阳极伏安法测定盐酸氨溴索，被测的阳极峰电位为１．１０Ｖ（ｖｓ．ＳＣＥ），另外，在０．４６Ｖ处还产生一对可逆的氧化还原峰。１．１０ Ｖ处的峰电流与盐酸氨溴索的浓度在３．９８×１０~（－７）～６．３４ × １０~（－５）ｍｏｌ／Ｌ范围内呈良好的线性关系，该方法的检出下限为３．０ × １０~（－８）ｍｏｌ／Ｌ。用标准加入法测得回收率范围为９２．８％～１０２％，ＲＳＤ为２．９％（ｎ＝１０）。对电极响应机理进行了初步探讨，氨溴索在１．１０ Ｖ处的氧化为不可逆过程，其氧化产物在０．４６０Ｖ处产生一对２电子２质子受扩散控制的可逆波，用该波也可进行定量测定并且干扰较少，但灵敏度略低。     

乙二胺铜－铁氰复合修饰电极薄膜的电沉积和结构表征及电化学性质

乙二胺铜－铁氰复合修饰电极薄膜的电沉积和结构表征及电化学性质陈昌国，李海梅，黄宗卿（重庆大学化工学院重庆６３００４４）关键词：铜、乙二胺，铁氰，修饰电极，光谱普鲁士兰（ＰＢ）修饰电极因其独特的电致变色现象而倍受关注。在１９７８年以来的十余年间里已相继...     

载体对负载型TiO2催化剂光催化性能的影响

 以活性碳（AC）和镁铝尖晶石（MA）为载体，采用真空吸附水解法制备了负载型光催化剂TiO2／AC和TiO2／MA，并采用TiO2溶胶负载法制备了活性碳负载催化剂TiO2（C）／AC．以氯仿为探针分子研究了其在催化剂上的吸附及光催化降解反应性能．结果表明，催化剂的制备方法、TiO2负载量与载体的吸附性能对光催化活性有明显的影响．通过优化制备条件，TiO2／AC催化剂的催化活性可提高到纳米TiO2的2．5倍．氯仿在AC上的饱和吸附量较高，但吸附强度较弱；在纳米TiO2上的吸附情况则正好相反．氯仿在AC和TiO2上吸附性质的差异有利于吸附在TiO2／AC上的氯仿分子从活性碳载体向TiO2光催化活性中心迁移．镁铝尖晶石载体对光催化反应没有明显的促进作用，与其基本上不吸附氯仿分子有关．与TiO2胶体负载法相比，真空吸附水解法是一种较好的负载型TiO2光催化剂制备方法．     

氧化钨薄膜微型电化学器件的研究

本文论述了WO_3薄膜氢离子敏器件的结构、原理、制备技术和测试分析。利用WO_3薄膜在H+溶液中由绝缘转化为导电特性,成功地研制成氢离子敏器件。这是一种简易而经济的微型pH敏器件技术。     

Cecropin B抗菌肽接枝丝素蛋白膜的制备和表征

以体积分数为60%的乙醇处理制得不溶性再生丝素膜, 通过碳二亚胺法将Cecropin B抗菌肽共价接枝到丝素膜表面, 利用红外光谱、扫描电镜、X射线能谱和抗菌性测试等手段对制得的丝素膜结构和表面特性及其抗菌性能进行了测试分析. 结果表明, Cecropin B抗菌肽成功地接枝到了丝素膜的表面, 接枝后的丝素膜水溶性低, 并具有良好、 持久的抗菌能力.     

可剥离膜去除不锈钢表面铀污染的研究

退役的核设施中不锈钢制件表面附着的放射性污染物 ,必须经去污处理后才能回收利用。铀是核工业中最常见的污染放射性元素 ,而不锈钢是核设施中最常用的耐腐蚀金属材料 ,由于以ＵＯ2 +2 状态存在的铀 (Ⅵ ) ,在空气和自身的辐射作用下 ,将逐渐转变为不同的氧化物。采用酸性去污液对不锈钢表面铀污染进行浸泡和擦试去污的方法 ,可以有效的除去不锈钢表面铀污染[1] 。但因浸泡需大量的去污液 ,随之产生大量的带有放射性的废液 ,对这些废液还必须经进一步的浓缩———固化处理。擦试法虽产生固体废物 ,但去污操作麻烦 ,难以对大批量、形状复杂…     

LiCoO_2 electrode/electrolyte interface of Li-ion batteries investigated by electrochemical impedance spectroscopy

The storage behavior and the first delithiation of LiCoO2 electrode in 1 mol/L LiPF6-EC:DMC:DEC elec- trolyte were investigated by electrochemical impedance spectroscopy (EIS). It has found that, along with the increase of storage time, the thickness of SEI film increases, and some organic carbonate lithium compounds are formed due to spontaneous reactions occurring between the LiCoO2 electrode and the electrolyte. When electrode potential is changed from 3.8 to 3.95 V, the reversible breakdown of the resistive SEI film occurs, which is attributed to the reversible dissolution of the SEI film component. With the increase of electrode potential, the thickness of SEI film increases rapidly above 4.2 V, due to overcharge reactions. The inductive loop observed in impedance spectra of the LiCoO2 electrode in Li/LiCoO2 cells is attributed to the formation of a Li1-xCoO2/LiCoO2 concentration cell. Moreover, it has been demonstrated that the lithium-ion insertion-deinsertion in LiCoO2 hosts can be well described by both Langmuir and Frumkin insertion isotherms, and the symmetry factor of charge transfer has been evaluated at 0.5.