助剂钾在Ni－Co－O、Zn－Co－O尖晶石催化剂中的作用

助剂钾在Ｎｉ－Ｃｏ－Ｏ、Ｚｎ－Ｃｏ－Ｏ尖晶石催化剂中的作用陈敏，罗孟飞，袁贤鑫（杭州大学催化研究所杭州３１００２８）关键词助剂钾，Ｎｉ－Ｃｏ－Ｏ，Ｚｎ－Ｃｏ－Ｏ，复合氧化物在多相催化领域中，尖晶石复合氧化物作为催化剂，有很大的实用性，Ｍａｒｇｏｌｉｓ...     

Studies of the Henry reaction catalyzed by Cu–O and Zn–O complexes with dimethoxysilane-bridged derivatives

Dimethyldimethoxysilane, methylphenyldimethoxysilane, and diphenyldimethoxysilane have been synthesized by a one-step, simple method and used as catalysts in the Henry reaction with Cu(OAc)₂·H₂O and Zn(OAc)₂·2H₂O, affording 60–96% conversion under the optimum catalytic conditions.     

Synthesis,characterisation and X-ray structure of a novel porphyrin array employing Zn–O and O–H…O bonding motifs

The preparation and characterisation of the free-base and zinc metallated derivatives of 5,10,15,20-tetrakis(4-(2-(2-hydroxyethoxy)ethoxy)phenyl)porphyrin 1 is described. The X-ray crystal structure of the Zn(II) adduct 2 dimerises in the solid state via an intermolecular polyether oxygen–Zn(II) interaction (O…Zn = 2.124(4) Å). The porphyrin dimers form discrete layers defined by a distance of 5.10 Å between the porphyrin planes in adjacent layers. A bilayer sheeting arrangement of the porphyrin macrocyclic units is achieved through cooperative hydrogen bonding of the ethoxyethanol arms to form 11-membered macrocycles containing four hydrogen bonds.     

Thermal Behavior of Zn(Thr)SO_4·H_2O

IntroductionRecently,a considerable interest has been fo-cused on the complexes of zinc with amino acidsdue to their excellent additives in medicine foodstuff and cosmetics[1— 6] .The investigation on thethermal behavior and the thermochemistry of somezinc amino acids is important to its further applica-tion,which has been reported in references[4,5 ,7— 1 0 ].However,the studies on solid complexZn( Thr) SO4· H2 O has not been reported,whichcan provide the necessary data and the foundation…     

配合物Zn(Leu)SO4·O.5H2O的合成与热行为

在水-丙酮溶液中制备了zn(Leu)SO4@0.5H2O的配合物.通过热重和红外分析,研究了它的热分解机理,可分为三步完成.第一阶段配合物的脱水过程在60-180℃,形成Zn(Leu)S04,第二阶段,Zn(Leu)SO4进一步分解为Zn(Leu)SO4@9ZnSO4,随后其在728℃完全分解为ZnO.在不同线性升温5.O,10.0,15.0,20.OK@min-1条件下,用两种积分法和三种微分法研究了题目化合物失去配体过程的非等温动力学,相应过程的表观活化能E为133.78KJ@mol-1,指前因子A为1O8.19s-1,配体失去过程为三维扩散机理控制,并建立了反应过程的动力学方程.     

Zn3(OH)2V2O7·2H2O纳米片的水热制备

采用硝酸锌、五氧化二钒和氢氧化钠作为反应物,通过一个简单的CTAB辅助的水热方法制备了Zn3(OH)2V2O7·2H2O纳米片.运用XRD,ICP-AES,FTIR,HRTEM,EDS,FE-SEM对产物的晶相和形貌进行了表征.结果表明CTAB在控制产物的形貌、尺寸分布和自组装过程中起着关键作用.同时我们研究了产物的晶体生长行为和自组装过程.     

Zn/V2O5水相二次电池的交流阻抗研究

The dependence of charge transfer resistances of electrodes in the aqueous Zn/V 2O 5 secondary battery on the Zn 2+ amount intercalated was studied by means of AC impedance experiments. The results showed that the electrode reaction on cathode was controlled by the diffusion of Zn 2+ at the beginning of the discharge process. With the increase of Zn 2+ amount intercalated into the cathode, the reaction became a kinetic controlled process, i.e.a process controlled by intercalation of Zn 2+ in V 2O 5.     

复盐Zn2HIO6• 1.25H2O的热化学研究

由于高碘酸盐及其复盐晶体具有优良的电学性能和抗腐蚀性能,在分析上也很有应用价值［１］三元相高碘酸盐－高碘酸－水系统早在６０年代就引起了人们的兴趣,Ｄｒａｔｏｖｓｋｙ等人对它进行了大量的研究［２－５］．八十年代Ｎａｂａｒ等人用新的方法合成了几种新的高碘...     

Characterization of superparamagnetic Mg x Zn1−x Fe2O4 powders

Structural and magnetic properties of Mg _x Zn_1−x Fe₂O₄ powders have been studied with respect to the application for thermal cancer therapy (magnetic hyperthermia). Mg _x Zn_1−x Fe₂O₄ (x=0.1–0.5) powders with particle sizes between 5 and 8 nm were produced by citrate method. The X-ray diffraction patterns of the samples correspond to a spinel phase. The lattice constant and the volume of the elementary cell increase when x changes from 0.1 to 0.5. The FTIR-spectra ascertain the spinel phase formation. The Mossbauer studies reveal the presence of extremely small particles, which undergo superparamagnetic relaxation at room temperature. The core-shell model has been applied to explain quadruple doublets. The quadruple splitting at “shells” is bigger than those at “cores” whereas the isomer shifts remain close. Magnetic studies confirm the presence of extremely small particles that behave as superparamagnetic ones.      

一个新颖的由Zn配合物修饰的Keggin型钴钨酸盐：[Zn(2,2’-bipy)3]3{[Zn(2,2’-bipy)2(H2O)]2 [HCoW12O40] 2 }.H2O

通过水热合成技术,一个新颖的基于Zn配合物修饰的Keggin型钴钨酸的有机-无机杂化化合物：[Zn(2,2’-bipy)3]3{[Zn(2,2’-bipy)2(H2O)]2 [HCoW12O40] 2 }.H2O已经被合成,化合物通过红外光谱、热重分析和单晶X-射线衍射进行了表征。单晶X-射线衍射的结果显示标题化合物是由一个单支撑的{[Zn(2,2’-bipy)2(H2O)]2 [HCoW12O40] 2}6-多阴离子,三个[Zn(2,2’-bipy)3]2+阳离子和一个水分子构成。有趣的是[Zn(1)(2,2’-bipy)3]2+阳离子通过氢键连接在一起形成螺旋链。另外标题化合物在空气中是稳定的,并且在室温下显示了强的荧光。     

Zn/V2O5水相二次电池的交流阻抗研究

钒的氧化物,特别是Ｖ6Ｏ13与Ｖ2Ｏ5,由于具有层状结构,可以嵌入一定量的小体积阳离子而保持原有的晶体结构基本不变,因而作为电池的可逆嵌入电极材料,一直受到广泛重视[1-9].从考虑降低电池生产成本、提高电池的安全性和充分利用我国的钒资源角度出发,本课题组研究了锌与一些钒氧化物组成的二次电池,主要是Ｚｎ/Ｖ6Ｏ13有机相二次电池[10]和Ｚｎ/Ｖ2Ｏ5水相二次电池[11,12].研究结果表明,在一定范围内,锌离子能够可逆地嵌入到上述钒氧化物的层状结构中.该类二次电池具有价格低、安全性能好、能量密度大并具有适度的循环寿命和贮存寿命等优点…     

Na1.0Zn1.62Si1.38O4.84·0.6H2O的水热合成及离子导电性质

Anew sodium zincosilicate single crystal Na_1.0Zn_1.62Si_1.38O_4.84·0.6H₂O with size of 0.3mm×0.3mm×0.3 mm was prepared by hydrothermal synthesis method. Powder X-ray diffraction analysis result shows that this compound is a new phase.The compound is stable up to 500℃. The results of ACimpedance measurement shows that its ionic conductivity at 450℃ is 2×10^-4S·cm^-1 and the activation energy for ionic conduction is 79.64 KJ/mol.     

Study on Phase Relations in Zn3V2O8–ZnMoO4 System

The phase equlibria established in the Zn₃V₂O₈–ZnMoO₄ system over the whole component concentration range up to 1000°C have been investigated. A phase diagram has been constructed using the results of DTA and XRD methods. This revised version was published online in July 2006 with corrections to the Cover Date.     

Cu0.05Zn0.95O/聚吡咯纳米复合物的制备和抗菌性能

在CTAB/正己烷/正丁醇/水（W/O）四元反相微乳液体系中原位聚合制备了铜掺杂氧化锌/聚吡咯（CZ/PPy）纳米复合物.用X射线衍射仪、扫描电子显微镜、透射电子显微镜、红外光谱仪和紫外-可见光谱仪分别表征了样品的结构、形貌和光谱学性能;以大肠杆菌（Escherichia coli）、金黄色葡萄球菌（Staphylococcus aureus）和白色念珠菌（Candida albicans）为测试菌株研究了样品的抗菌活性.结果表明PPy包覆在CZ粒子表面形成了核-壳结构的CZ/PPy复合物,PPy链与CZ纳米粒子之间存在一定的相互作用;复合物的抗菌性能优于CZ,且抗菌活性随着CZ含量的增加而增大.     

Über die galvanische Kette: O2 (an Kohle)/KOH/Zn

Zusammenfassung Katalysierte Sauerstoffelektroden in alkalischen Elektrolyten werden in unbelastetem und stromlieferndem Zustand untersucht. Spannungsmessungen bei verschiedenem und pH weisen auf eine reversibel arbeitende O₂/H₂O₂-Elektrode hin.Ionenaktivitäten in konzentrierten KOH-Lösungen werden ermittelt.Am arbeitenden Element O₂, Kohle/KOH/Zn wird die Abhängigkeit der Klemmenspannung von der Laugenkonzentration untersucht, wobei man mit Hilfe einer neuartigen Unterbrecherschaltung besser reproduzierbare Kurven erhält als bei Ruhespannungsmessungen.Die Temperaturkoeffizienten der Spannungen belasteter und unbelasteter O₂-Kohleelektroden zeigen verschiedene Vorzeichen.Das Potential der Zinkelektrode in alkalischer Lösung wird als Funktion des pH, der Temperatur und der Belastung untersucht und die Bildung eines Zink-Hexahydroxokomplexes bestätigt.Mit 6 Abbildungen     

Tris(Znsalen) cryptand minimizes Znsalen aggregation arising from intermolecular Zn…O interaction

Exploring the factors to control Znsalen aggregation is of importance to design functional materials in catalysis, optical materials and biological imaging. In this work, we synthesized and characterized four cryptand type triZnsalen complexes and found that cryptand structure could efficiently minimize intermolecular Zn···O interaction. More importantly, encapsulated by PLGA nanoparticles, cryptand triZnsalen 1 displayed visible intracellular fluorescence whereas monomeric Znsalen 5 could not. These results provide a new access to design new luminescent materials with the potential application in optics and biological studies.