A Neutron Diffraction Study for the Crystal Structure of the Deuterium（hydrogen） L－Arginine Phosphate Monohydrate

ＡＮｅｕｔｒｏｎＤｉｆｆｒａｃｔｉｏｎＳｔｕｄｙｆｏｒｔｈｅＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆｔｈｅＤｅｕｔｅｒｉｕｍ（ｈｙｄｒｏｇｅｎ）Ｌ－ＡｒｇｉｎｉｎｅＰｈｏｓｐｈａｔｅＭｏｎｏｈｙｄｒａｔｅＣｈｅｎｇＺｈｉ－Ｘｕ；ＣｈｅｎｇＹｕＦｅｎ；Ｇｕ...     

Preparation and Characterization of Lacunary Heteropolymolbdophosphates Coordinated with Divalent Metal Ions of the Fourth Period

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＬａｃｕｎａｒｙＨｅｔｅｒｏｐｏｌｙｍｏｌｂｄｏｐｈｏｓｐｈａｔｅｓＣｏｏｒｄｉｎａｔｅｄｗｉｔｈＤｉｖａｌｅｎｔＭｅｔａｌＩｏｎｓｏｆｔｈｅＦｏｕｒｔｈＰｅｒｉｏｄＱＩＮＤｕ－ｊｉｅａ...     

C_(19)-DITERPENOID ALKALOIDS OF DELPHINIUM MOLLIPILUM

Ｃ_（１９）－ＤＩＴＥＲＰＥＮＯＩＤＡＬＫＡＬＯＩＤＳＯＦＤＥＬＰＨＩＮＩＵＭＭＯＬＬＩＰＩＬＵＭ￥ＳｕｏＭｉｎｇＺＨＡＮＧ；ＱｉｎｇＹｕＯｕ（ＬａｎｚｈｏｕＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈｙｓｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉ?..     

Study on Infrared Spectra and Chemical Bonding of the Cluster Anion ［Cl_2FeS_2MoS_2Cu（PPh_3）_2］~－

ＳｔｕｄｙｏｎＩｎｆｒａｒｅｄＳｐｅｃｔｒａａｎｄＣｈｅｍｉｃａｌＢｏｎｄｉｎｇｏｆｔｈｅＣｌｕｓｔｅｒＡｎｉｏｎ［Ｃｌ_２ＦｅＳ_２ＭｏＳ_２Ｃｕ（ＰＰｈ_３）_２］~－ＫｏｎｇＸｉａｎ－Ｌｉｎｇ；ＣｈｅｎＺｈｉ－Ｄａ；ＳｈｅｎｇＴｉａｎ－Ｌｕ；ＷｕＸｉ...     

Structural Features and Interrelation of Two New Trinuclear Mo－S Cluster Compounds

ＳｔｒｕｃｔｕｒａｌＦｅａｔｕｒｅｓａｎｄＩｎｔｅｒｒｅｌａｔｉｏｎｏｆＴｗｏＮｅｗＴｒｉｎｕｃｌｅａｒＭｏ－ＳＣｌｕｓｔｅｒＣｏｍｐｏｕｎｄｓＬｕＳｈａｏ－Ｆａｎｇ；ＷｕＱｉａｎｇ－Ｊｉｎ；ＣｈｅｎＨｏｎｇ－Ｂｉｎｇ；ＹｕＲｏｎｇ－Ｍｉｎ；Ｈｕａｎ...     

Syntheses and Liquid Crystal Properties of New Rare Earth Sandwich-Type Heteropoly Compounds

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｓａｎｄｗｉｃｈ－ｔｙｐｅｃｏｍｐｏｕｎｄｓｏｆｆｏｒｍｕｌａ［Ｍ４（Ｈ２Ｏ）２（Ｐ２Ｗ１５Ｏ５６）２］ｎ－ｗｅｒｅｆｉｒｓｔｌｙｄｅ－ｓｃｒｉｂｅｄｂｙＦｉｎｋｅｅｔａｌ．［１］,ａｄｏｚｅｎｏｆｔｈｉｓｋｉｎｄｏｆｃｏｍｐｏｕｎｄｓｈａｖｅｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄ［２,３］,ｉｎｗｈｉｃｈｍｏｓｔｏｆｔｈｅｃｅｎｔｅｒａｔｏｍｓｗｅｒｅｔｒａｎｓｉｔｉｏｎｍｅｔａｌｓ,ｓｕｃｈａｓＭｎ２＋,Ｆｅ３＋,Ｃｏ２＋,Ｎｉ２＋,Ｃｕ２＋,Ｚｎ２＋,Ｃｄ２＋,ａ…     

Crystal and Molecular Structure of （μ—FcCO）（μ—t—BuS）Fe2（CO）6

ＣｒｙｓｔａｌａｎｄＭｏｌｅｃｕｌａｒＳｔｒｕｃｔｕｒｅｏｆ（μ－ＦｃＣＯ）（μ－ｔ－ＢｕＳ）Ｆｅ_２（ＣＯ）_６ＬｉｕＪｉｎ－Ｔｉｎｇ（ＣｏｌｌｅｇｅｏｆＣｈｅｍｉｓｔｒｙ，ＳｈａｎｄｏｎｇＵｎｉｖｅｒｓｉｔｙ，Ｊｉｎａｎ，２５０１００）Ｒｅｃｅｉｖ...     

EPR Study of a New Crystal of the Binuclear Copper（Ⅱ） Cluster Compound－〔Cu_2（α－C_（10）H_7CH_2CO_2）_4－（DMF）_2〕·（DMF）_2·H_2O

ＥＰＲＳｔｕｄｙｏｆａＮｅｗＣｒｙｓｔａｌｏｆｔｈｅＢｉｎｕｃｌｅａｒＣｏｐｐｅｒ（Ⅱ）ＣｌｕｓｔｅｒＣｏｍｐｏｕｎｄ－〔Ｃｕ_２（α－Ｃ_（１０）Ｈ_７ＣＨ_２ＣＯ_２）_４－（ＤＭＦ）_２〕·（ＤＭＦ）_２·Ｈ_２Ｏ￥ＳｕｎＱｉｏｎｇ－Ｌｉ；ＨｕａｎｇＸ?..     

Preparation and Characterization of Macroporous Resin Immobilized Pd－Cu Bimetallic Cluster Catalysts

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＭａｃｒｏｐｏｒｏｕｓＲｅｓｉｎＩｍｍｏｂｉｌｉｚｅｄＰｄ－ＣｕＢｉｍｅｔａｌｌｉｃＣｌｕｓｔｅｒＣａｔａｌｙｓｔｓＷｕＳｈｉｈｕａ；ＺｈｕＣｈａｎｇｙｉｎｇ；ＨｕａｎｇＷｅｉｑｉｎｇ，...     

LOCAL STRUCTURE OF COPPER IN Cu－ZSM－5 CATALYST FOR NITRIC OXIDE DECOMPOSITION

ＬＯＣＡＬＳＴＲＵＣＴＵＲＥＯＦＣＯＰＰＥＲＩＮＣｕ－ＺＳＭ－５ＣＡＴＡＬＹＳＴＦＯＲＮＩＴＲＩＣＯＸＩＤＥＤＥＣＯＭＰＯＳＩＴＩＯＮ￥ＳｈｕＮｏｎｇＦＡＮＧ；ＹｉＬｕＦＵ；ＰｅｉＹａｎＬＩＮ（Ｄｅｐｔ．ｏｆＣｈｅｍ．Ｐｈｙｓ．，Ｕｎｉｖ．ｏｆＳｃｉ...     

Formation of two-dimensional (2D) lead dendrites by application of different regimes of electrolysis

Electrodeposition of lead from nitrate electrolyte in constant regimes of electrolysis was analyzed and the obtained powder lead deposits were examined by scanning electron microscopy. Polarization curve for lead electrodeposition consisted of two parts separated by an inflection point. The first part of the polarization curve was characterized by a linear dependence of the current density on overpotential. The linear part of the polarization curve corresponded to ohmic-controlled electrodeposition and single lead crystals were formed in this range of overpotentials. A rapid increase in the current density with increasing overpotential was observed after the inflection point (the second part of the polarization curve). Two-dimensional dendrites were the dominant morphological forms obtained at overpotentials and current densities belonging to the second part of the polarization curve, indicating that the rapid increase of the current density with increasing overpotential corresponded to activation controlled electrodeposition at the tips of the formed dendrites. Comparing the morphologies of the obtained lead deposits with those belonging to the same group of metals (metals characterized by a high exchange current density), such as silver, cadmium, and tin, a strong dependence between the nucleation type and the shape of dendrites for the metals belonging to the same group was established.     

一种新型的钛基纳米多孔网状铂电极对甲醇氧化反应的电催化活性

利用水热法一步制备出钛基纳米多孔网状铂催化剂(nanoPt/Ti), 并研究了它对甲醇氧化反应的电催化活性.     

两步法制备多孔硅及其表征I:恒电流法(英文)

本工作通过采用电化学极 -化学氧化两步法在 1:1氢氟酸和乙醇溶液中制备出孔径约为 1～ 2 μm ,厚度大经为 6～ 10 μm的多孔硅样品 .首先将 0 .0 3A/cm2 的恒电流施加到p( 10 0 )硅片一段时间 ,然后将该硅片浸到 2 0 %的硝酸溶液中氧化一段时间 .通过此方法获得的多孔硅结构再进一步用扫描电子显微镜和拉曼光谱仪进行表面形貌和光学性质的考察 .所有制备出的多孔硅结构均有光致发光现象 .老化的多孔硅样品 (在干燥器放置一年 )的光致发光谱峰强度明显增强 ,但分别经过苯乙烯和十六碳烯 ( 1)两种有机溶剂处理 1h后的老化多孔硅样品的光致发光强度却没有显著改变 .     

Potentiostatic versus galvanostatic electrodeposition of nanocrystalline Al–Mg alloy powders

Nanocrystalline supersaturated dendritic Al–Mg powders were electrodeposited using potentiostatic and galvanostatic techniques under equal-charge conditions. In potentiostatic deposition morphology depended on applied potential: featherlike at lower and globular at higher potentials. Galvanostatic deposits yielded both morphologies at any current density. Morphological evolution was observed in galvanostatic deposits from featherlike to globular. Independent of deposition technique face-centered cubic Al(+Mg) phase with ∼7 atom% Mg (featherlike) with/without ∼20 atom% Mg (smooth globular) composition formed at lower applied/realized potentials (or deposition rates). Higher applied/realized potentials showed hexagonal close packed Mg(+Al) phase with ∼80 atom% Mg (rough globules) over smooth globules. Potentiostatic and galvanostatic deposits were compared for their morphologies, phases, and compositions.     

Direct measurement of concentration distribution within the boundary layer of an ion-exchange membrane

In this study the concentration distributions within the diffusion boundary layer were obtained by directly measuring the potential drops while the currents (under- and overlimiting) passed through the Neosepta CMX cation-exchange membrane (Tokuyama Corp., Japan). Potential drops according to the distance from the membrane surface on the depleted side were measured using a microelectrode to obtain the concentration profile. From the concentration profiles obtained, it was observed that the diffusion boundary layers existed in the range of 300-350 microm, which reasonably coincide with the theoretical diffusion boundary layer thickness calculated from the limiting current density. Although there were some deviations between the concentrations determined from the Nernst model and those from experiments, it was confirmed that the Nernst model effectively depicts the transport phenomena in the ion-exchange membrane system. In addition it was found that the salt concentration at the membrane surface increased when the currents applied exceeded the limiting current. It is thought that the concentration polarization formed in the diffusion boundary layer at currents near or lower than the limiting current was disturbed by a turbulent convection when the current was greater than the limiting current. As a consequence, the concentration at the membrane surface increased to a sufficient level for generation of the overlimiting current.     

碳钢在生物膜和硫化物膜下的电化学腐蚀行为

应用丝束电极技术比较了SRB生物膜以及硫化物膜对Q2 35碳钢腐蚀过程的影响机制 ,采用电位、电流扫描技术测试了生物膜和FeS膜下的碳钢腐蚀不均匀性特征 ,发现由于膜的导电性致使表面电位扫描已不能作为膜下局部腐蚀的判据 .动电位扫描表明无氧近中性溶液中 ,硫化物膜对碳钢具有一定保护作用 .电化学阻抗谱显示 ,硫化物膜电容增加缓慢 ,其极化电阻Rp 随时间呈先增后降的趋势 .与硫化物膜相比 ,生物膜表现出极大的电容 (10 4 ～ 10 5μF/cm2 ) ,且膜电容随时间呈S型增加 ,而极化电阻Rp 则呈指数下降 ,由此可知生物膜加速了腐蚀     

银锡双金属催化剂的制备及其对氧还原的催化性能

在乙醇为溶剂和还原剂、碳粉为载体的体系中,采用水热法将Ag+或Ag+-Sn2+还原,形成纳米多孔网状结构的Ag或Ag-Sn双金属纳米颗粒,制备碳粉负载的Ag/C和Ag-Sn/C催化剂。 利用循环伏安和线性扫描技术,研究了碱性溶液中这些催化剂对氧还原反应(ORR)的电活性。 研究表明,Ag/C和Ag-Sn/C对ORR均表现出强的电催化活性,它们对ORR的起始电位约0.05 V（vs.Ag/AgCl）。 在Ag97Sn3/C催化剂上,ORR的电流密度为2.87×10-3 A/cm2(800 r/min),高于Ag/C。 Levich方程分析表明,在Ag-Sn/C催化剂上,ORR转移电子数明显大于Ag/C,说明在Ag-Sn/C催化剂上,氧气能够较为彻底被还原。 此外,在甲醇存在下,Ag/C和Ag-Sn/C对ORR的活性基本保持不变,表明它们对甲醇有较强的耐受力。     

电位活化现象与金属电沉积初始过程的研究

进行了恒电流电位-时间曲线和循环伏安曲线的测定，显示了铁电极进行氰化物镀铜时，镀层沉积前铁表面的电位活化过程. 对铁电极上焦磷酸盐镀铜的初始过程研究表明，由于铜的析出电位较正，铜是在未活化的电极表面上沉积的，因此镀层的结合强度很差.采用氩离子溅射和X射线光电子能谱相结合的方法，检测焦磷酸盐镀铜层和铁基体界面区含氧量的变化，证明了氧化层的存在. 通过添加辅助络合剂和控制起始电流密度的方法，可以增强无氰电镀时阴极的极化. 当铜的析出电位负于铁基体的活化电位时，可显示出铁表面的电位活化过程，定量测量镀层的结合强度也与氰化物电镀相近.     

Highly efficient AuPd–WC/C electrocatalyst for ethanol oxidation

A composite material of AuPd–WC/C has been rapidly prepared by the intermittent microwave heating (IMH) method. The material is nanostructured and well dispersed on carbon according to the SEM and TEM measurements. The activity of the AuPd–WC/C electrocatalyst for the oxidation of ethanol in alkaline solution is significantly higher than that of Pt/C at the same total electrocatalyst loadings. The onset potential shifts towards negative side for 200 mV and the peak current density increases ∼3 times for the ethanol oxidation reaction on AuPd–WC/C electrocatalysts as compared to that on Pt/C. In addition, the AuPd–WC/C electrocatalyst is more stable under constant current density polarization than that of Pt/C. It indicates that no strongly adsorbed species formed during the oxidation of ethanol on AuPd–WC/C because the cleavage of the C–C bond of the ethanol is difficult on this Pt-free electrocatalyst. The high activity makes AuPd–WC/C electrocatalyst a potential candidate for the application in direct ethanol fuel cells and ethanol sensors.     

Electrically driven flow near a colloidal particle close to an electrode with a Faradaic current

To elucidate the nature of processes involved in electrically driven particle aggregation in steady fields, flows near a charged spherical colloidal particle next to an electrode were studied. Electrical body forces in diffuse layers near the electrode and the particle surface drive an axisymmetric flow with two components. One is electroosmotic flow (EOF) driven by the action of the applied field on the equilibrium diffuse charge layer near the particle. The other is electrohydrodynamic (EHD) flow arising from the action of the applied field on charge induced in the electrode polarization layer. The EOF component is proportional to the current density and the particle surface (zeta) potential, whereas our scaling analysis shows that the EHD component scales as the product of the current density and applied potential. Under certain conditions, both flows are directed toward the particle, and a superposition of flows from two nearby particles provides a mechanism for aggregation. Analytical calculations of the two flow fields in the limits of infinitesimal double layers and slowly varying current indicate that the EOF and EHD flow are of comparable magnitude near the particle whereas in the far field the EHD flow along the electrode is predominant. Moreover, the dependence of EHD flow on the applied potential provides a possible explanation for the increased variability in aggregation velocities observed at higher field strengths.