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Growth of Anisotropic Platinum Nanostructures Catalyzed by Gold Seed Nanoparticles

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Nano Research 2008年第3期1卷 249-257页

作者： zheng fang Yuliang zhang Feifei Du Xinhua Zhong Laboratory for Advanced Materials Department of ChemistryEast China University of Science&TechnologyShanghai 200237China

This paper reports an effective method for the synthesis of platinum nanostructures with anisotropic morphologies by decomposition of platinum dichloride in oleylamine at intermediate temperatures catalyzed by gold seed nanoparticles.A small quantity of spherical gold nanoparticles formed in situ was used to trigger the nucleation and anisotropic growth of the Pt *** varying the amount of gold seed nanoparticles,porous fl ower-like,irregular polyhedron-shaped,multi-branched rod shaped,and caterpillar-like Pt nanostructures were produced in high yields at 190240°C in reaction times of a few *** of morphology under different conditions has been systematically studied and a kinetically controlled induced growth mechanism has been proposed.

关键词： Platinum nanostructure gold seed nanoparticles synthesis

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双重响应性纳米凝胶在药物装载中的应用

粘接 2018年第7期39卷 49-54页

作者：夏蒙段兰兰苏铭吉方正平张玉红有机化工新材料湖北省协同创新中心有机功能分子合成与应用教育部重点实验室湖北大学化学化工学院湖北武汉430062

综述了双重响应性聚合物在纳米载药中的研究进展,由于具有刺激响应性的高分子纳米凝胶在药物运输领域引起了广泛的关注,为此着重介绍了温度/pH、温度/还原剂、pH/还原性和pH/磁性等双重响应性聚合物在纳米载药领域的应用,并对响应性纳... 详细信息

综述了双重响应性聚合物在纳米载药中的研究进展,由于具有刺激响应性的高分子纳米凝胶在药物运输领域引起了广泛的关注,为此着重介绍了温度/pH、温度/还原剂、pH/还原性和pH/磁性等双重响应性聚合物在纳米载药领域的应用,并对响应性纳米凝胶的研究进行了展望。

关键词：纳米凝胶双重响应应用进展

Hemoglobin-glucose oxidase catalyzed polymerization of aniline:Electrochemical study and application

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Chinese Chemical Letters 2013年第10期24卷 934-936页

作者： Hong-fang zhang Jian-Bin zheng Rui-Xiao Liu Ministry of Education Key Laboratory of Synthetic and Natural Functional Molecular Chemistry College of Chemistry and Materials ScienceNorthwest University Institute of Analytical Science Northwest University

A new method for the formation of electroactive polyaniline （PANI） biocatalyzed by hemoglobin coupled with glucose oxidase in neutral medium on the polystyrene nanospheres （PS） modified glassy carbon electrode, was investigated. The bio-polymerized PANI formed on the PS was confirmed by the obvious increase of the diameter of the particles on the scanning electron microscopy image. The cyclic voltammetric behavior of the PANI was also investigated. PANI produced an oxidative peak at 0.28 V and a reductive peak at 0.23 V. Based on the glucose-dependent bio-polymerization, a new electrochemical protocol for the estimation of glucose was developed. The square wave voltammetric response of PANI deposited on the modified electrode increased linearly with glucose concentration in the range of 0.1- 10.0 μmol/L. The efficient performance of hemoglobin-oxidase biocatalyzed polymerization of aniline provides a new concept for the synthesis of nanomaterials, and a general protocol for the development of the biosensors.

关键词： Biocatalysis Polyanitine Electrochemical Glucose

Catalytic alkane dehydrogenations

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Science Bulletin 2015年第15期60卷 1316-1331页

作者： Yuxuan zhang Wubing Yao Huaquan fang Aiguo Hu zheng Huang Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and Engineering East China University of Science and Technology State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

Olefins find widespread applications in the synthesis of polyolefins and fine chemicals. With an increasing demand for olefins, the technologies for alkane dehydrogenation have drawn much attention. Several types of heterogeneous catalysts have found applications in industry for the dehydrogenation of light alkanes, mainly ethane, propane, and butane. In the past three decades, a number of transition-metal complexes,particularly pincer-ligated iridium complexes, have been developed as the homogeneous catalysts for alkane dehydrogenations. The homogeneous catalyst systems operate under much milder conditions compared with the heterogeneous systems, and some systems exhibit good activity and high regioselectivity in dehydrogenation of alkanes longer than butane.

关键词： Olefins Alkane dehydrogenation Heterogeneous catalysts Homogeneous catalysts Pincer ligand Iridium complexes

Measurement and Analysis of Three-Dimensional Surface Topography of Sawn Timber Based on Scanning Probe Method

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Journal of Renewable Materials 2022年第12期10卷 3303-3311页

作者： Yuhang He Rongzhuo zhang Sarah Mohrmann zheng Wang Jiujin fang Jiangsu Co-Innovation Center of Efcient Processing and Utilization of Forest Resources College of Materials Science and TechnologyNanjing Forestry UniversityNanjing210037China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037China

In order to explore the characteristics of the three-dimensional surface morphology of sawn timber,a three-dimensional wood surface morphology tester based on the scanning probe method and the principle of atomic force microscope was used to test the three-dimensional sur face morphology of three kinds of sawn timber and calculate its surface *** study also analyzed the reasonable plan for the value of wood surface roughness and the advantages of the three dimensional shape tester,as well as the influence of tree species,three sections,air dry density and other factors on the surface roughness of the specimen after mechanical *** results have shown that it is a more appropriate method to select the calculated values of S。and Sq as the evaluation of the surface roughness of wood with random surface *** three dimensional wood surface topo-graphy tester can efficiently,conveniently and accurately display the three dimensional topography of wood at a micron-level resolution,and is characterized by high eficiency and good *** three dimensional surface morphology characteristics of the three sawn woods correspond to their *** surface roughness of woods is arranged as follows:Sitka spruce>Larch>*** the same tree species,the roughness of the corresponding section after sawing is as follows:chordwise section>crosswise section>radial *** radial section has lower roughness than the other *** surface roughness of the wood after sawing is mainly related to its air-dry *** above is intended to provide a useful reference for the application of measuring and evaluating the surface roughness of sawn timber using the three dimensional surface topography test method.

关键词： Scanning probe sawn timber three dimensional topography test surface roughness

An Effective RAID Data Layout for Object-Based De-duplication Backup System

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Chinese Journal of Electronics 2016年第5期25卷 832-840页

作者： YAN fang TAN Yu'an zhang Quanxin WU Fei CHENG Zijing zheng Jun School of Computer Science and Technology Beijing Institute of Technology School of Information Beijing Wuzi University Beijing Engineering Research Center of Massive Language Information Processing and Cloud Computing Application Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Space Star Technology CO. LtdChina Academy of Space Technology

We propose an alternative Redundant array of independent disks(RAID) data layout, Asymmetrical grouping data organization(AGDO), for object-based data de-duplication backup system. Object-based data deduplication is an effective solution for detecting duplicate data for compound files. We designed an asymmetrical grouping strategy, the disk in the array are partitioned into different groups, and in each group parallelism data access scheme is adopted, different types of objects are stored in different groups with maybe different group size, it can set and manage dynamic group size by using dynamic disk group adjustment algorithms. The performance of AGDO is evaluated and proved to be sufficient for the continuous storage application. The result is that disk accesses are concentrated in a part of the disks over a long time period and reduces the power consumption to 25% in a 10-disk configuration. Moreover, object-based de-duplication combined with AGDO has great potential in increasing data restoration speed for compound files. We have shown that this combination makes average restoration speed improved 11%.

关键词： Data layout Object-based deduplication Backup Energy aware Redundant array of independent disks(RAID)

Impacts of permafrost degradation on streamflow in the northern Himalayas

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Science China Earth Sciences 2024年第6期67卷 1990-2000页

作者： Linfeng FAN fang JI Xingxing KUANG Zhilin GUO Rui zhang Chunmiao zheng State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610299China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210024China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Ningbo 315200China

The Himalayan water tower provides crucial water resources for *** degradation is deemed to exert important impacts on streamflow in the Himalayan ***,the magnitudes of such impacts remain poorly ***,we established a robust hydrological model that incorporated active layer deepening and ground ice melt for the drainage basin of the largest river in the northern Himalayas-the Yarlung Zangbo River(YZR).We estimated that permafrost degradation led to~0.65 km^(3)/yr decrease in surface runoff and~0.35 km^(3)/yr increase in baseflow and ground ice melt contributed~0.25% to the annual streamflow in the YZR for the period ***“fill-and-spill”mechanism helps explain the seeming contradiction of observed increasing versus decreasing baseflow in different permafrost regions *** propose that the dilution of riverine dissolved organic carbon(DOC)concentrations by baseflow may lead to the riverine DOC hysteresis *** study not only lays solid scientific basis for water resources management in the Himalayas,but also yields new insights into how to interpret measured river discharge and nutrient flux in permafrost regions over the globe.

关键词： Permafrost degradation Hydrology Streamflow Surface runoff Groundwater Himalayas

Evolution of soil DOM during thermal remediation below 100℃:concentration,spectral characteristics and complexation ability

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 31-41页

作者： Wan Huang Ziren Wan Di zheng Lifeng Cao Guanghe Li fang zhang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China National Engineering Laboratory for Site Remediation Technologies Beijing 100015China

The impact of thermal remediation on soil function has drawn increasing *** far,as the most active fraction of soil organic matter,the evolution of dissolved organic matter(DOM)during the thermal remediation lacks in-depth investigation,especially for the temperatures value below 100℃.In this study,a series of soil thermal treatment experiments was conducted at 30,60,and 90℃ during a 90-d period,where soil DOM concentration increased with heating temperature and *** molecular weight,functional groups content and aromaticity of DOM all decreased during the thermal *** excitation-emission matrices(EEM)results suggested that humic acid-like substances transformed into fulvic acid-like substances(FIII/FV increased from 0.27 to 0.44)during the heating process,and five DOM components were further identified by *** change of DOM structures and components indicated the decline of DOM stability and hydrophilicity,and can potentially change the bioavailability and *** temperature also resulted in the decline of DOM complexation ability,which may be caused by the loss of binding sites due to the decrease of polar function groups,aromatic structures and hydrophilic *** study provides valuable information about the evolution of DOM during thermal remediation,which would potentially change the fate of metal ions and the effectiveness of the post-treatment technologies in the treated region.

关键词： Thermal remediation below 100℃ Heating temperature Soil DOM concentration DOM spectral characteristics Excitation-emission matrices(EEM) Complexation ability

Performance improvement of β-Ga2O3 SBD-based rectifier with embedded microchannels in ceramic substrate

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Science China(Information Sciences) 2024年第5期67卷 341-342页

作者： Wen HONG Chao zhang fang zhang Xuefeng zheng Xiaohua MA Yue HAO State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian University

With the development of integrated circuits, there is a growing demand for higher power devices [1]. Gallium oxide（Ga2O3） holds promise for high power devices due to its wide bandgap and high breakdown electric field strength [2].However, its low thermal conductivity induces severe selfheating effects, limiting its performance and ***, effective thermal management techniques are urgently needed for Ga2O3devices.

关键词： Gallium compounds