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Hydroalumination of diazo and azido compounds:An Al-H addition to end-on nitrogen of substrates

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science china Chemistry 2010年第9期53卷 1970-1977页

作者： CHU ChenHui1,YANG Ying1,2 & ZHU HongPing1 1state Key laboratory of Physical Chemistry of solid Surfaces national engineering laboratory for Green Chemical Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical engineering,Xiamen university,Xiamen 361005,china 2School of Chemistry and Chemical engineering,Central South university,Changsha 410083,china state Key laboratory of Physical Chemistry of solid Surfaces national engineering laboratory for Green Chemical Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical engineering Xiamen University Xiamen China School of Chemistry and Chemical engineering Central South University Changsha China

This paper reports the reactions of a monomeric aluminum dihydride LAlH2(L = HC[C(Me)N(Ar)]2,Ar = 2,6-i-Pr2C6H3) with diazo,azido,and terminal alkyne *** reaction of LAlH2 with N2CH(SiMe3) and N3(1-Ad) occurred through an Al-H addition to end-on nitrogen to yield respective compounds LAl[N(H)N = CH(SiMe3)]2(1) and LAl[N(H)N=N(1-Ad)]2(2),while the reaction of LAlH2 with PhC≡CH occurred through a stepwise deprotonation to yield LAlH(C≡CPh)(5) and LAl-(C≡CPh)2(6),respectively.2 further reacted by N2-release to yield LAl[NH(1-Ad)][N(H)N=N(1-Ad)](3) and LAl[NH-(1-Ad)]2(4) upon the increased temperature *** 1-6 have been fully characterized,revealing novel reactivity patterns of LAlH2 toward different substrates under the steric influence from the bulky L ligand at Al.

关键词： hydroalumination bulky aluminum hydride multiple-bond molecule Al–H addition

THE ROLE OF INTERFACIAL DIFFUSION IN SRBI2TA2O)9 THIN FILMS CAPACITORS

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THE ROLE OF INTERFACIAL DIFFUSION IN SRBI2TA2O)9 THIN FILMS ...

Anomalous magnetotransport in LaMn_(1-x)Te_xO_3

第8届国际材联电子材料国际研讨会

作者： Aidong Li, Di Wu, Huiqing Ling, Xinhua Zhu, Tao Yu, Zhiguo Liu, Naiben Ming national laboratory of solid state microstructures, nanjing university, nanjing 210093, P. R. china materials science and engineering department, nanjing university, nanjing 210093, P. R. china Center for Advanced Studies in science and Technology of microstructures, nanjing 210093, P. R. china

During preparation of multilayer films, interracial diffusion critically affects film performance. In this report, SrBiTaO (SBT) thin films were prepared on Pt/TiO/SiO/Si substrates using metalorganic decomposition spin-on technique. Impact of different heat treatment processing, film thickness, top electrode postanneal and atmosphere anneal on interfacial diffusion has been investigated by X-ray diffraction (XRD),

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 987-992页

作者： TAN GuoTai1,2, CHEN ZhengHao3 & ZHANG XiaoZhong4,5 1 Key laboratory of Beam Technology & materials Modification of the Ministry of Education, Institute of Low Energy Nuclear Physics, Beijing Normal university, Beijing 100875, china 2 Beijing Radiation Center, Beijing 100875, china 3 laboratory of Optical Physics, Institute of Physics, Chinese Academy of sciences, Beijing 100080, china 4 Key laboratory of Advanced materials of the Ministry of Education, department of materials science and engineering, Tsinghua university, Beijing 100084, china 5 Beijing national Center for Electron Microscopy, Tsinghua university, Beijing 100084, china Key laboratory of Beam Technology & materials Modification of the Ministry of Education Institute of Low Energy Nuclear Physics Beijing Normal University Beijing China Beijing Radiation Center Beijing China laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing China Key laboratory of Advanced materials of the Ministry of Education Department of Materials Science and Engineering Tsinghua University Beijing China Beijing national Center for Electron Microscopy Tsinghua University Beijing China

The LaMn1-xTexO3+δ (x=0.1, 0.2, 0.3) were synthesized using solid-state reaction method for the first time. X-ray photoemission spectrum (XPS) shows that in the samples the Te ions have a valence of Te4+, and Mn3+ ions are partly converted into Mn2+ and Mn4+ due to the excess oxygen and Te doping. The magnetotransport associated with Mn2+, Mn3+ and Mn4+ was investigated. The experimental results show that the samples are insulator at 0 T when the amount of Mn3+ is much larger or less than the sum of Mn2+ and Mn4+; by contrast, the samples display metal to insulator transition with increasing temperature when the amount of Mn3+ is close to the sum of Mn2+ and Mn4+. These anomalous magnetotransport behaviors were analyzed in the frame of the double-exchange (DE) mechanism.

关键词： colossal magnetoresistance La-Te-Mn-O magnetotransport

复合材料LiNbO_3/Terfenol-D的磁电效应

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四川大学学报（自然科学版） 2005年第S1期42卷 83-87页

作者：杨盼尹媛赵可朱劲松南京大学固体微结构国家重点实验室南京210093

制备了2-2型复合磁电材料Li NbO3/Terfenol-D,研究了其在不同频率交流激励磁场和直流偏磁场下的磁电耦合效应.为了充分利用Li NbO3晶体大的压电系数d15和d22使其在横场长度伸缩振动模式和厚度伸缩振动模式中获得较大的压电效应,本文选择... 详细信息

制备了2-2型复合磁电材料Li NbO3/Terfenol-D,研究了其在不同频率交流激励磁场和直流偏磁场下的磁电耦合效应.为了充分利用Li NbO3晶体大的压电系数d15和d22使其在横场长度伸缩振动模式和厚度伸缩振动模式中获得较大的压电效应,本文选择了(xzt)41°切型的Li NbO3晶体作为复合材料Li NbO3/Terfenol-D的压电相,通过计算其压电系数从理论上得出了与实验比较一致的结果,即该材料具有较大的磁电耦合系数,在频率为114kHz交流磁场的激励下,当直流磁偏场达到1.9kOe时,获得磁电耦合系数的最大值2.1V/***.另外还发现一定频率范围内该材料出现了独特的多个最优化直流磁偏场现象.本文对以上现象进行了讨论.

关键词：磁电效应压电系数复合材料LiNbO_3/Terfenol-D

Study on interaction between macrocell and microcell in the early corrosion process of reinforcing steel in concrete

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science china(Technological sciences) 2010年第5期53卷 1285-1289页

作者： LI LanQiang1,DONG ShiGang1,WANG Wei2,HU RongGang1,DU RongGui1,LIN ChangJian1,ZHUO XiangDong1 & WANG Jia2 1 state Key laboratory of Physical Chemistry of solid Surfaces,department of Chemistry,College of Chemistry and Chemical engineering,Xiamen university,Xiamen 361005,china 2 College of Chemistry and Chemical engineering,Ocean university of china,Qingdao 266100,china state Key laboratory of Physical Chemistry of solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University College of Chemistry and Chemical engineering Ocean University of China

An array electrode technique was developed as a novel electrochemical method for studying the interaction between macrocell and microcell in the early corrosion process of reinforcing steel in cement *** corrosion potential and galvanic current of macrocell corrosion of the reinforcing steel in cement mortar were imaged by the array electrode technique during the corrosion initiation and *** was certified that the corrosion macrocell current is closely related with the difference of corrosion potential between the anodic and cathodic *** corrosion macrocell and microcell always exist during the corrosion *** interaction of corrosion macrocell and corrosion microcell of steel in concrete was directly sensed by the array electrode for the first time,and was discussed in terms of corrosion electrochemistry.

关键词： reinforcing steel in concrete array electrode macrocell microcell

Controllable synthesis of Ni-catalyzed tetragonal tungsten nanowires via chemical vapor deposition

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Progress in Natural science:materials International 2012年第5期22卷 514-519页

作者： Chao Wang a,Yuehui He a,Chaoqun Peng b,Shiliang Wang a,c,Xinli Liu a a state Key laboratory of Powder Metallurgy,Central South university,Changsha 410083,china b School of material science and engineering,Central South university,Changsha 410083,china c School of Physics science and Technology,Central South university,Changsha 410083,china state Key laboratory of Powder Metallurgy Central South University Changsha 410083 China School of material science and engineering Central South University Changsha 410083 China School of Physics science and Technology Central South University Changsha 410083 China

Tetragonal single-crystal tungsten nanowires were successfully synthesized by chemical vapor deposition(CVD) catalyzed by Ni *** influences of the catalysts,temperature and growth time on the formation of the nanowires were *** was found that the tetragonal tungsten nanowires(WNWs) arrays were obtained by deterministic growth from the ordered Ni catalyst particles with one-to-one relation in size and position between the catalysts and *** large-scale tungsten nanowire arrays were synthesized at the low temperature of 950℃.Samples were characterized by X-ray diffraction(XRD),field-emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HRTEM).Increasing growth time at 950℃,the tip of the WNWs changed from four(211) planes to four(110) *** controls of the orientation and structure of WNWs arrays were important for adjusting their properties to satisfy different requirements of potential nanodevices.

关键词： Tungsten nanowires Ni catalysts Chemical vapor deposition Nanostructures

Optimum Design of a Novel Magnetoelectric Composite Structure

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Optimum Design of a Novel Magnetoelectric Composite Structur...

Effect of leachate inoculum on biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process

The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics

作者： Y. X. Liu, J. M. Liu, J. G. Wan, C. W. Nan department of Civil engineering, Logistical engineering university, Chongqing, 400041, china laboratory of solid state microstructure, nanjing university, nanjing, 210093, china department of materials science and engineering, Tsinghua university, Beijing, 100084, china

Magnetoelectric (ME) effect is a cross two -field effect, characterized by appearanc e of an electric polarization upon applying a magnetic field or with the change of magnetization on applying an electric field. As a potential magnetic field probe and transducer for magneto -electric conversion among many other applications, the ME effect has been attracting attention since its discovery half-century ago. Besides the ferroelectromagnets as the long -time objects of the related researches, ME-composite materials represent the systems where strong ME effect is expected based on the idea of product property of composite materials. Along this line, quite a number of ME composite materials were fabricated in order to reach the optimized ME effect. The great difference between the experimental data and theoretical prediction reminds us of the neces sity of real-scale modeling of the ME effect in those ME composite materials. One may argue that the mechanical coupling between the two components is highly structure -sensitive, whiles an experimental search for such a resonance is tedious and costive. On the other hand, a numerical modeling of the ME effect is definitely suggestive for pre-design and optimization of novel ME composite materials and structures of potential giant ME property.

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Journal of Environmental sciences 2009年第8期21卷 1162-1168页

作者： ZHANG Dongqing, HE Pinjing, SHAO Liming state Key laboratory of Pollution Control and Resources Reuse, Key laboratory of Yangtze River Water Environment, College of Environmental science and engineering, Tongji university, Shanghai 200092, china. state Key laboratory of Pollution Control and Resources Reuse Key Laboratory of Yangtze River Water Environment College of Environmental Science and Engineering Tongji University

The biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process has become of great interest for biostabilization or biodrying. The study aimed at investigating the effect of leachate inoculurn on the biopretreatment. During the hydrolytic stage, the inoculum addition at the ratio of leachate to waste （LWR） of 5% and 7% stimulated the start-up of hydrolysis and enhanced the hydrolysis rate by 27.4% and 24.2%, respectively; whereas the inoculation at LWR of 1% had almost no effect on the hydrolysis rate and the inoculation at LWR of 10% reduced the hydrolysis rate by 12.7%. During the subsequent aerobic stage, the inoculations at LWRs greater than 5% decreased organics degradation rate. As a whole, compared with none inoculation, the total degradation rates of organics for inoculating trials at LWRs of 5%, 7% and 10% decreased by 14.5%, 14.3% and 32.7%, respectively. Correspondingly, their net water removal rates were reduced by 4.4%, 5.8% and 19.0%. The inoculation at LWR of 1% could not significantly affect the biopretreatment. The inoculum addition at LWR of 5% and 7% could shorten hydrolytic stage and thus accelerate the whole combined process. Moreover, the inoculations at LWRs greater than 5% were favorable for lignocelluloses degradation.

关键词： biopretreatment hydrolysis-aeration inoculation leachate municipal solid waste

Effect of the Structure and Acidic Property of Activated Bentonite on Removal of Olefin in Aromatics

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china Petroleum Processing & Petrochemical Technology 2009年第4期11卷 23-26页

作者： Wu Wenjuan Chen Changwei Wang Xin Shi Li (The state Key laboratory of Chemical engineering,East china university of science and Technology, Shanghai 200237) state Key laboratory of Chemical engineering East China University of Science and Technology Shanghai 200237 China

In this research work,three kinds of activated bentonite used as solid acid catalysts had been synthesized and studied on removal of olefins from the reformate *** bentonite samples were analyzed using the BET and pyridine-FTIR measurements to investigate their physical and chemical *** results showed that both textural properties and surface acidity of the bentonite could affect the catalytic *** the catalyst samples,one kind of bentonite purchased from Hubei with high surface area,high pore volume and more acid sites revealed high activity in removing olefins from the reformate.

关键词： bentomte N_2 adsorption isotherm pore size distribution acid sites