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Hybrid Composite of Polyaniline Containing Carbon Nanotube

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Chinese Chemical Letters 2001年第11期12卷 1037-1040页

作者： Jian Guo DENG Xiao Bin DING yu xing peng Albert SCCHAN Chengdu Institute of Organic Chemistry Chinese Academy of SciencesChengdu 610041 Open Laboratory of Chirotechnology and Department of Applied Biology and Chemical Technology Hong Kong Polytechnic UniversityHong Kong

Carbon nanotube-polyaniline hybrid material was synthesized by emulsion polymerization in-situ. The morphology of hybrid material was studied by TEM and X-ray diffraction. The conductivity of nanocomposite increases with the increasing of carbon nanotube content because of the new conductivity passageways formed by carbon nanotubes.

关键词： carbon nanotube polyaniline hybrid material

Fast synthesis of dopamine-coated Fe_3O_4 nanoparticles through ligand-exchange method

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Chinese Chemical Letters 2012年第9期23卷 1099-1102页

作者： peng An Fang Zuo yuan peng Wu Jun Hua Zhang Zhao Hui Zheng Xiao Bin Ding yu xing peng Chengdu Institute of Organic Chemistry Chinese Academy of SciencesChina Chengdu 610041 Graduate School of the Chinese Academy of Sciences China Beijing 100049 State Key Laboratory of Polymer Materials and Engineering of China Polymer Research InstituteSichuan UniversityChina Chengdu 610065 College of Chemistry&Environment Protection Engineering Southwest University for NationalitiesChina Chengdu 610041 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation So0uthwest Petroleum University(SWPU)China Chengdu 610500

A fast approach was described for the synthesis of water-dispersible monodisperse dopamine-coated Fe304 nanoparticles （DA- Fe304） with uniform size and shape via ligand-exchange of oleic acid on Fe304 using only 2 min. The prepared DA-Fe304 nanoparticles were characterized by transmission electron microscopy, Fourier transform infrared spectrometry, and vibrating sample magnetometer. The results indicated that the resulting DA-Fe304 nanoparticles had an average diameter of about 19.2 nm. The magnetic saturation value of the prepared DA-Fe304 nanoparticles was determined to be 72.87 emu/g, which indicating a well- established superparamagnetic property.

关键词： Magnetic nanoparticles Fe304 Dopamine Ligand-exchange

Cross-linking Copolymerization of Acrylic Acid and Multi-armed Cross-linkers

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Chinese Chemical Letters 2001年第11期12卷 1029-1032页

作者： Qiang CHEN Ying GUAN Xian Min ZHANG yu xing peng Jian XU State Key Laboratory of Polymer Physics&Chemistry Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080 Chengdu Institute of Organic Chemistry Chinese Academy of SciencesChengdu 610041 Department of Information&Elctronic Engineering Zhejiang UniversityHangzhou 310027

The overall cross-linking copolymerization of acrylic acid and multi-armed cross-linkers are investigated by in situ interferometry. The results show that the more arms the cross-linkers have, the higher the polymerization rate is. However, they also mean the existence of less cross-linking efficiency and some defects in gel network.

关键词： multi-armed cross-linker acrylic acid in situ interferometry

Growth mechanism of CdS film prepared by chemical bath deposition

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Rare Metals 2014年第3期33卷 324-329页

作者： xing-yu peng Hong-Wei Gu Teng Zhang Fa-Zhu Ding Fei Qu Hong-Yan Wang Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

In this paper, sodium citrate was adopted as a complexing agent and ammonia merely served as pH adjustor to investigate the growth mechanism of CdS film The growth rate, structural properties, surface morphology microstructure, and optical properties of CdS films were studied by profilometer, X-ray diffractometer（XRD）scanning electron microscopy（SEM）, transmission elec tron microscopy（TEM）, and spectrophotometer, respec tively. The SEM images show that CdS films prepared with higher ammonia concentration have lower nucleation density on substrate. SEM and EDS results show that the formation of Cd（OH）2is not required in the growth of CdS film. As the ammonia concentration increases, the sites tha previously adsorbed S2-are taken by OH-which leads to lower S2-density on substrate. CdS film forms through direct reaction of Cd2？with the S2-which are adsorbed on the substrate. Lower S2-density on the substrate results in the decrease of particle density on the substrate. The as deposited CdS films have relatively high-average trans mittance（＊80 %） in the wavelength range from 500 to1,000 nm which makes them suitable to be used in sola cell.

关键词： CdS Chemical bath deposition Ammoniaconcentration Growth mechanism

Morphological evolution of CdS films prepared by chemical bath deposition

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Rare Metals 2013年第4期32卷 380-389页

作者： xing-yu peng Hong-Wei Gu Teng Zhang Fei Qu Fa-Zhu Ding Hong-Yan Wang Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences

In this article, the growth process of chemical bath deposited CdS films was systematically investigated. The structural, optical, and morphological properties were investigated by X-ray diffraction （XRD）, transmission electron microscope （TEM）, UV-Vis spectrophotometer, scanning electron microscope （SEM）, respectively. CdS nanocubes with size of less than 500 nm and nanocrystal-lites with diameter of less than 5 nm forming in reaction solution are observed. According to the TEM results and the SEM morphological evolution of CdS films, a crystal-lite-by-crystallite growth mechanism is proposed to eluci-date the growth process of chemical bath deposited CdS films based on the present growth mechanism.

关键词： CdS Chemical bath deposition Growthmechanism Crystallite-by-crystallite

Electrical and optical properties of ZnO:Al films with different hydrogen contents in sputtering gas

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Rare Metals 2015年第3期34卷 173-177页

作者： Fei Qu Teng Zhang Hong-Wei Gu Qing-Quan Qiu Fa-Zhu Ding xing-yu peng Hong-Yan Wang Applied Superconductors Key Laboratory Institute of Electrical EngineeringChinese Academy Sciences

Aluminum-doped zinc oxide （ZnO：AI） films were deposited by direct current magnetron sputtering in incorporating hydrogen in sputtering gas at room temper- ature. The influences of hydrogen content in sputtering gas on the structural, optical, and electrical properties of ZnO：A1 films were systematically investigated. It is found that hydrogen incorporated into ZnO lattice forms shallow donors in ZnO：A1 films and plays an important role in the properties of ZnO：A1 films. The electrical conductivity and infrared （IR） reflectance are improved due to the increase of electron carrier concentration, and the average trans- mittance decreases, which is ascribed to the strong scat- tering from the hydrogen incorporated and oxygen vacancies in ZnO：A1 films. In this study, the resistivity of 5.5 × 10-4 Ω.cm is obtained, the average transmittance of the wavelength in the range of 400-900 nm is almost 86 %, and the IR reflectance reaches 75 % at 2,500 nm, which is higher than that of reported TCO films. The band gap determined by optical absorption is a result of com- petition between Burstein-Moss effect and many-body perturbation effect. However, the hydrogen content in sputtering gas is above 10 %, and the optical band gap shift is independent of hydrogen content in sputtering gas.

关键词： ZnO:A1 thin films Hydrogen Electricalresistivity Transmittance IR reflectance

Synthesis of Molecularly Imprinted Polymer Particles by Suspension Polymerization in Silicon Oil

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Chinese Chemical Letters 2006年第9期17卷 1243-1246页

作者： Xiao Bing WANG Zhao Hui ZHENG Xiao Bin DING Xu CHENG Xin Hua HU yu xing peng Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Graduate School of the Chinese Academy of Sciences Beijing 100081

Molecularly imprinted polymers using 2,4-dichlorophenoxyacetic acid （2,4-D） as templates were prepared by suspension polymerization in silicon oil. The polymer particles exhibited regular shape in the micro-scale range. The adsorbing experiments indicated that the imprinted polymer particles possessed higher affinity to 2,4-D than the non-imprinted polymer particles.

关键词： Molecularly imprinted polymer particles suspension polymerization silicon oil.

Meeting deadlines for approximation processing in MapReduce environments

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Frontiers of Information Technology & Electronic Engineering 2017年第11期18卷 1754-1772页

作者： Ming-hao HU Chang-jian WANG yu-xing peng National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China

To provide timely results for big data analytics, it is crucial to satisfy deadline requirements for MapReduce jobs in today＇s production environments. Much effort has been devoted to the problem of meeting deadlines, and typically there exist two kinds of solutions. The first is to allocate appropriate resources to complete the entire job before the specified time limit, where missed deadlines result because of tight deadline constraints or lack of resources; the second is to run a pre-constructed sample based on deadline constraints, which can satisfy the time requirement but fail to maximize the volumes of processed data. In this paper, we propose a deadline-oriented task scheduling approach, named ＇Dart＇, to address the above problem. Given a specified deadline and restricted resources, Dart uses an iterative estimation method, which is based on both historical data and job running status to precisely estimate the real-time job completion time. Based on the estimated time, Dart uses an approach-revise algorithm to make dynamic scheduling decisions for meeting deadlines while maximizing the amount of processed data and mitigating stragglers. Dart also efficiently handles task failures and data skew, protecting its performance from being harmed. We have validated our approach using workloads from OpenCloud and Facebook on a cluster of 64 virtual machines. The results show that Dart can not only effectively meet the deadline but also process near-maximum volumes of data even with tight deadlines and limited resources.

关键词： MapReduce Approximation jobs Deadline Task scheduling Straggler mitigation

IN SITU INTERFEROMETRIC STUDY ON THE GELATION PROCESS OF POLYACRYLIC ACID GELS

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Chinese Journal of Polymer Science 2000年第4期18卷 373-377页

作者： Ying Guan Qiang Chen Xian-min Zhang yu-xing peng Jian Xu Polymer Physics Laboratory, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China Department of Information & Electronic Engineering, Zhejiang University, Hangzhou 310027, China Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China 中科院化学所高分子物理及化学国家重点实验室北京浙江大学浙江杭州中科院成都有机化学所四川成都

In situ interferometry was used to investigate the gelation process of polyacrylic acid (PAA) gels. The basic principle of the in situ interferometry technique is illustrated. It can give sufficient information for non-destructive and successful investigation of the whole gelation process. The effect of initiator concentration on the gelation process was studied. The polymerization rate of AA increases with increasing initiator concentration. The error arising from the thermal effect in the gelation process can be neglected.

关键词： in situ interferometry gelation polyacrylic acid