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Preparation of Nanosized AlOOH and Its Application in Polymer-inorganic Nanocomposites

Journal of Wuhan University of technology(Materials Science) 2008年第5期23卷 638-643页

作者：廖海达 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Chemistry and Ecological Engineering Guangxi University for Nationalities Key Lab of Nonferrous Materials and New Processing Technology (Guangxi University Guilin University of Technology) Ministry of Education

With industrial grade Al（OH）3 as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automatically disperse to a single-dispersing state in water without surface modification, dispersant, additive and accessional conditions （ultrasonic wave dispersing, ball-mill dispersing）. The application results of the product indicate that the nanosized AlOOH can be composed into a toughened nanocomposites without surface modification. Accordingly, the self dispersion characteristic and mechanism of hydrothermal crystallization and charging composite dispersion of nanosized AIOOH are found, and a new technique of preparing polymer/inorganic nanocomposites is proposed, which is called blending compositing new techniques of sol even dispersing at auasi-homogeneous phase.

关键词： self dispersion nanosized AlOOH peptizing-hydrothermal method nanocomposites

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Preparation of High Performance Green Alumina Ceramic Balls by Roller Production Waste

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武汉理工大学学报（材料科学版）（英文版） 2008年第1期23卷 134-138页

作者： ZHONG Lianyun WU Bolin ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Key Lab of Nonferrous Materials and New Processing Technology( Guangxi University Guilin University of Technology) of Ministry of EducationGuilin 541004China School of Chemistry and Ecological Engineering Guangxi University for NationalitiesNanning 530006China Key Lab of Nonferrous Materials and New Processing Technology Guangxi University Guilin University of Technology of Ministry of EducationGuilin 541004China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

To reuse roller waste as a raw material of high performance green ceramic balls,three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with90% Al2O3 were prepared,and the Al2O3 content of the prepared balls was 75%.It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one: the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the *** main crystal phase of the ceramic ball is mullite and *** ceramic ball granular is uniform and fine with 4-5 um average *** pore diameter is about 2 *** wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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Effect of annealing on laser-ablated *** 5+xO15+2x thin films

Effect of annealing on laser-ablated *** 5+xO15+2x thin film...

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作者： Zhan, Z.S. Gong, Y.S. Wang, C.B. Shen, Q. Zhang, L.M. State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

In this study, K3Li2-xNb5+xO 15+2x (KLN) thin films were prepared by laser-ablated a sintered ceramic target. For an optimum deposition condition, in-situ post annealing method was employed on as-deposited films. XRD measurements showed that KLN films with (310) preferred orientation were obtained on fused quartz substrate. Surface morphology studies indicated mat in-situ post annealing could improve the surface quality of KLN thin films. The average transmittance of as-deposited and annealed films in the visible range was nearly 80% to 90%.

关键词： Thin films

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Simultaneous transmission of high-speed point-to-point data and double broadcast services in a WDM-PON system with source-free ONUs

Simultaneous transmission of high-speed point-to-point data ...

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Optical Transmission, Switching, and Subsystems VI

作者： Chang, Qingjiang Huang, Mingfang Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology GA 30332 United States

We propose that double broadcast services can be overlaid over high-speed point-to-point downlink data in a WDM-PON with source-free optical network units (ONUs). In the optical line terminal (OLT), a set of single-drive MachZehnder modulators (MZMs) are driven by downlink point-to-point data to generate a differential phase-shift keying (DPSK) format. The downlink DPSK signals from different wavelengths are multiplexed and then fed to a following dual-parallel MZM (DPMZM) as a double broadcast services transmitter. The broadcast service-l is an optical carrier suppression (OCS) format, while the broadcast service-2 is an inverse return-to-zero (IRZ) forma. After the transmission, at each ONU, the optical signals are separated by an optical filter. The filtered OCS signal is detected to retrieve the broadcast service-1. The DPSK/IRZ signals are split into three parts, one part is detected by an IRZ receiver to recover the broadcast service-2, the second part is detected by a DPSK receiver to retrieve the downlink data and the third part is re-modulated by the upstream amplitude shift keying (ASK). We also perform an experiment to verify the feasibility of the proposed scheme, where the power penalties of less than 1.5 dB are obtained after 25-km transmission with 1.25-Gb/s data rate. © 2008 SPIE.

关键词： Digital storage

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Slow light and signal processing in silicon nano-waveguides

Slow light and signal processing in silicon nano-waveguides

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2008 IEEE PhotonicsGlobal at Singapore, IPGC 2008

作者： Su, Yikai Li, Qiang Fangfei Liu Qingjiang Chang Ziyang Zhang Min Qiu State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University 800 DongChuan Rd Shanghai 200240 China Department of Microelectronics and Applied Physics Royal Institute of Technology Sweden

We report various all-optical signal processing functions using silicon microring resonators with a 450250-nm cross section. These demonstrations include slow-light delay of phase-modulated data and microwave photonic... 详细信息

ISBN: (纸本)9781424429059

关键词： Silicon

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Optical properties of pulsed laser deposited K3Li2Nb5O15 thin films

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2008年第2期37卷 297-300页

作者： Zhan, Zu-Sheng Gong, Yan-Sheng Wang, Chuan-Bin Shen, Qiang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

Potassium lithium niobate (KLN:K3Li2Nb5O15) thin films have been deposited on quartz glass by pulsed laser deposition (PLD) technique using a stoichiometric KLN target, which was prepared by solid reaction with K2CO3, Li2CO3, and Nb2O5 powders as starting materials. X-ray diffraction (XRD) and Raman studies have revealed that tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation could be achieved at the substrate temperature of 700°C and the oxygen partial pressure of 10 Pa. The average transmittance of as-deposited thin films in the visible range was nearly 90%.

关键词： Ferroelectric thin films

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Concentric silicon micro-ring resonators with enhanced transmission notch depth

Concentric silicon micro-ring resonators with enhanced trans...

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Optoelectronic Materials and Devices III

作者： Li, Xiaohui Zhang, Ziyang Li, Qiang Qiu, Min Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China Department of Microelectronics and Applied Physics Royal Institute of Technology 164 40 Kista Sweden

In this work, we have analyzed, fabricated and demonstrated concentric micro-ring resonators in silicon-on-insulator (SOI) structure for enhanced transmission notches. The operation principles of the concentric ring resonators are studied by time-domain coupled-mode theory. Directional coupling between concentric rings offers another freedom in designing deep notch optical filters and ultra-sensitive biosensors. The finite-difference-time-domain (FDTD) simulations have shown the improvement of the notch depth, evenly distributed mode field and the effect of the resonance shift. The device is demonstrated in silicon-on-insulator structure. Transmission notch depth improvement of ~ 15dB is demonstrated for the 21-20.02-μm-radius double-ring structure comparing with the single 21-μm-radius ring. © 2008 SPIE.

关键词： Silicon on insulator technology

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Ultra-compact mode-split silicon microring resonator for format conversion from NRZ to FSK

Ultra-compact mode-split silicon microring resonator for for...

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Optoelectronic Materials and Devices III

作者： Liu, Fangfei Li, Qiang Zhang, Ziyang Qiu, Min Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University 800 Dongchuan Rd. Shanghai 200240 China Department of Microelectronics and Applied Physics Royal Institute of Technology Electrum 229 164 40 Kista Sweden

We propose and experimentally demonstrate all optical format conversion from non-return-to-zero (NRZ) format to frequency-shift-keying (FSK) format based on free carrier dispersion effect in a silicon mode-split microring resonator. The injection of the high-power NRZ signal generates free carriers leading to the blue shift of the spectrum when a '1' comes. Therefore, there is a selective filtering for the two probes with certain separation located at different position of the split mode according to the information carried by the NRZ signal. Then the NRZ signal is converted to the FSK format. The microring resonator features ultra-compact size with a radius of 10 urn thus is suitable for integration with silicon-on-insulator (SOI) based optical and electronic devices. The split mode can provide large and variable frequency deviation for the FSK signal. 1 Gb/s NRZ signal is successfully converted to FSK format with a frequency deviation of 40 GHz, which can find application for interconnection between a metropolitan area networks (MAN) and a passive optical network (PON) system. © 2008 SPIE.

关键词： Passive optical networks

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A metro-access integrated network with all-optical virtual private network function using DPSK/ASK modulation format

A metro-access integrated network with all-optical virtual p...

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Network Architectures, Management, and Applications VI

作者： Tian, Yue Leng, Lufeng Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China New York City College of Technology City University of New York 300 Jay Street BrooklynNY 11201 United States

ISBN: (纸本)9780819473776

All-optical virtual private network (VPN), which offers dedicated optical channels to connect users within a VPN group,is considered a promising approach to efficient internetworking with low latency and enhanced security implemented in the physical layer. On the other hand, time-division multiplexed (TDM) / wavelength-division multiplexed (WDM) network architecture based on a feeder-ring with access-tree topology, is considered a pragmatic migration scenario from current TDM-PONs to future WDM-PONs and a potential convergence scheme for access and metropolitan networks,due to its efficiently shared hardware and bandwidth resources. All-optical VPN internetworking in such a metro-access integrated structure is expected to cover a wider service area and therefore is highly desirable. In this paper, we present a TDM/WDM metro-access integrated network supporting all-optical VPN internetworking among ONUs in different sub- PONs based on orthogonal differential-phase-shift keying (DPSK) / amplitude-shift keying (ASK) modulation format. In each ONU, no laser but a single Mach-Zehnder modulator (MZM) is needed for the upstream and VPN signal generation, which is cost-effective. Experiments and simulations are performed to verify its feasibility as a potential solution to the future access service. © 2008 SPIE.

关键词： Passive optical networks

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Preparation of High Performance Grccn Alumina Ceramic Balls by Roller Production Waste

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Journal of Wuhan University of technology(Materials Science) 2008年第1期23卷 134-138页

作者：钟莲云吴伯麟 ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab of Nonferrous Materials and New Processing Technology （ Guangxi University Guilin University of Technology ） of Ministry of Education Guilin 541004 China School of Chemistry and Ecological Engineering Guangxi University for Nationalities Nanning 530006 China

To reuse roller waste as a raw material of high performance green ceramic balls, three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with 90% Al2O3 were prepared, and the Al2O3 content of the prepared balls was 75%. It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one： the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the highest. The main crystal phase of the ceramic ball is mullite and corundum. The ceramic ball granular is uniform and fine with 4-5 μm average size. The pore diameter is about 2 μm. The wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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