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Characterization and dispersion of carbon spheres modified by HNO 3 /H 2 O 2 oxidization in water

Carbon 2013年 63卷 595-595页

作者： Xing-mei Guo Hai-xing Liu Yong-zhen Yang Xu-guang Liu College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Ministry of Education Taiyuan 030024 China College of Material Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

Carbon spheres (CSs) were modified by a mixture of HNO 3 and H 2 O 2 with different volume ratios and concentrations to improve their dispersability in a liquid. The morphologies and microstructures of the modified CSs were characterized by field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectrometry and acid–base titration. Results show that the amount and types of oxygen-containing groups can be tuned by the concentration and ratio of HNO 3 /H 2 O 2. HNO 3 favors the formation of carboxyl and carbonyl groups while H 2 O 2 introduces mainly hydroxyl. The amount of oxygen-containing functional groups increases with the concentration of the oxidants when the volume ratio of HNO 3 /H 2 O 2 is 1, which is as high as 2.164 mmol/g when the concentrations of HNO 3 and H 2 O 2 are 16 and 8.8 M, respectively. The resulting CSs have a remarkable dispersability and stability in water. [New Carbon Materials 2013, 28(3): 228–234]

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Fabrication of Zr55Al10Ni5Cu30 Amorphous Composite Coating on Plain Carbon Steel by Laser Cladding and Remelting

Fabrication of Zr55Al10Ni5Cu30 Amorphous Composite Coating o...

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中国材料大会2012

作者： Gaozhi Jia Wenxian Wang Xu Liu Zeqin Cui Bingshe Xu College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education

ISBN: (纸本)9783037856079

A Zr-based amorphous composite coating was fabricated by laser cladding and remelting on plain carbon steel. The amorphous phase contents of coatings were tailored by controlling the power density. The effect of amorphous phase content along the depth direction on the microhardness and corrosion resistance of the coating was studied. The results showed that the content of amorphous phase significantly decreased from the remelted layer to the cladded layer. In addition, it was found that the maximum microhardness of the coating were about 1061 HV0.1 , observed 200 μm beneath the surface. Potentiodynamic polarization studies in 3.56 wt.% NaCl solution indicated that the remelted layer exhibited excellent corrosion resistance due to the high amount of amorphous phase.

关键词： Amorphous, Laser, Coating, Microhardnes, Corrosion resistance

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Effect of ECAP Pass on Corrosion Behavior of High-Al Content Magnesium Alloys

Effect of ECAP Pass on Corrosion Behavior of High-Al Content...

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中国材料大会2012

作者： Qiang Fan Wei Liang Liping Bian Manqing Cheng College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology

In view of low strength and poor corrosion resistance of Mg alloys, a Mg-12Al-0.7Si alloy was designed, fabricated and subjected to equal channel angular pressing(ECAP) in order to refine the microstructure. Microstructure observation and electrochemical performance test were conducted to investigate the influence of the microstructural variation subjected to multi-pass ECAP processing on the corrosion behavior of the alloy. The results showed that both α-Mg matrix and β-Mg17Al12 of the alloy were significantly refined after processing for different passes (2,4,6,8) through route BC, and the 4-pass ECAPed alloy in 3.5% NaCl solution presents the lowest weight loss, lower corrosion current and higher corrosion potential in the polarization curves. The reason for high corrosion resistance of 4-pass ECAPed alloy and the effects of grain size of the matrix and the particle size, distribution of second phase and dynamic precipitates on corrosion behavior of the alloy were discussed.

关键词： Magnesium alloy, Equal channel angular pressing (ECAP), Corrosion resistance, Grain refinement

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Study on Structure and Photocatalytic Properties of Cu2O Nanocrystal Synthesized by Low temperature Liquid-Phase Method

Study on Structure and Photocatalytic Properties of Cu2O Nan...

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中国材料大会2012

作者： Yingchao Liu Jinbo Xue Chengzhong Chi Wei Liang Guangliang Li College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856062;3037856068

Spherical and octahedral Cu2O nanocrystals were prepared by reducing copper acetate monohydrate (Cu(CH3COO)2·H2O) with hydrazine hydrate(N2H4·H2O) at ambient temperature and pressure. The influence of solution composition on the morphology and microstructure of Cu2O nanocrystals were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Ultraviolet and visible light spectrometer(UV-vis) was employed to investigate the photocatalysis behavior of the Cu2O samples. The results show that Cu(OH)2 was initially formed with the addition of NaOH and then reduced into Cu2O by N2H4·H2O. At the same time, a portion of Cu2O particles were further reduced to Cu, but the increasing of O2 contents in the solution under vigorous stirring reconvert Cu into Cu2O whichlead to the formation of pure Cu2O nanocrystals. The alkaline condition which provided by NaOH was the prerequisite for obtaining spherical and octahedral Cu2O crystals. The facile method was provided to fabricate Cu2O nanocrystals with outstanding photocatalysis performance at low temperature, which may play an important role in sewage treatment and organic pollutants decomposition.

关键词： Cuprous oxide, Liquid-phase reduction, Nanosphere, Octahedron, Photocatalysis

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Preparation of CdSe-TiO2 Nanotube Array Films and their Photoelectric Properties under Visible Light

Preparation of CdSe-TiO2 Nanotube Array Films and their Phot...

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中国材料大会2012

作者： Fei Yang Wei Liang Jinbo Xue College of Material Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856062

In this paper, CdSe-TiO2 nanotube array composite films were successfully prepared through a two-steps method. TiO2 nanotube arrays were firstly prepared by anodic oxidation method, based on which the composite films of CdSe-TiO2 nanotubes arrays were prepared by electrochemical deposition. The influence of the concentration of SeO2 on the structure and photoelectric performance of the composite films were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and photocurrent response tests. The results show that the cubic phase CdSe particles with the size of about 15～20 nm were uniformly distributed in highly ordered TiO2 nanotubes and around the mouths of the nanotubes;With the increasing of concentration of SeO2 , the content of CdSe increases gradually while the photocurrent density of the composite films increased and decreased, The optimal photoelectric performance of composite films were obtained when the SeO2 concentration was 4 mmol/L.

关键词： TiO2 nanotubes, CdSe, Anodic oxidation, Electrochemical process, Photocurrent.

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The Structural Characterization and Optical Properties of Zinc Oxide Films Synthesized by Electrochemistry Method

The Structural Characterization and Optical Properties of Zi...

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中国材料大会2012

作者： Jingxia Zheng Xingguo Zhao Wei Liang Jinbo Xue College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials(Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856062;3037856068

Flaky ZnO thin films were electrodeposited from an aqueous solution of zinc nitrate (Zn(NO3)2 ) as electrolyte on ITO glass substrate by cathodic reduction method The effect of electrolyte concentration on the structure, morphology and optical properties of ZnO thin films were studied by X-ray diffraction, scanning electron microscopy and UV-Vis spectrometer. The results show that the ZnO films are of hexagonal wurtzite structure;When the concentration of Zn(NO3)2 solution is 0.24 M, the sparse flaky ZnO thin films were prepared and the thickness and length of ZnO flaky are about 50 nm and 1～3 μm, respectively;When the electrolyte concentration is 0.16 M, hexagonal and triangular structures are observed and some lathy and conical ZnO structure start to appear;When the concentration of Zn(NO3)2 solution drops to 0.08 M, the matrix of films is still flaky ZnO, but porous structures among the flaky structures appear and the size of conical ZnO has changed, whose bottom diameter reaches 1～3 μm and length is 2～4 μm;UV-Vis absorption test results indicate the absorption peak and the bandgap of the prepared ZnO thin films are about 350 nm and 3.28 eV, respectively.

关键词： ZnO thin films, Electrochemical deposition, Morphology, Optical properties.

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Study on interface Characteristics of Al/Mg/Al Composite Plates Fabricated by Two-pass Hot Rolling

Study on Interface Characteristics of Al/Mg/Al Composite Pla...

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中国材料大会2012

作者： Changzeng Luo Wei Liang Xianrong Li Yajun Yao College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856086;3037856084

In this study, 5052/AZ31B/5052 composite plates were fabricated by two-pass hot rolling, under the rolling parameters 623 K/15 min/40% for the first pass and 673 K/10 min/50% for the second pass. The structure and element change in the zone of the joint interface were studied by means of optical microscope (OM), scanning electron microscope (SEM), and energy diffraction spectrum (EDS). The results showed that the bonding mode of the joint interface between AZ31B and 5052 alloy was metallic bonding after the first pass hot rolling, but the bonding mode of the finished composite plate appeared the distribution characteristic alternating with metallic bonding and metallurgical bonding. Two distinct intermediate layers including Mg17Al12 and Al3Mg2 can be clearly observed in the joint interface. During the second pass hot rolling, the AZ31B and 5052 layer were elongated along the rolling direction, while the Al3Mg2 and Mg 17Al12 layers were up in the joint interface. After the tensile strength testing of the composite plate, the interface bonding appeared very well without any debonding.

关键词： Two-pass hot rolling, Al/Mg/Al, Composite plate, interface, Bonding mode

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Fabrication of Carbon Fiber Reinforced Magnesium-based Composite Laminates by Vibration Assisting Hot Pressing

Fabrication of Carbon Fiber Reinforced Magnesium-based Compo...

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中国材料大会2012

作者： Shenyang Liu Jianjun Zhang Wei Liang Liping Bian Xianrong Li College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856086;3037856084

Carbon fibers reinforced AZ31 composite laminates were fabricated by vibration aided mechanical hot pressing. Optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyze their phase components and microstructure. The interfacial bonding strength was measured by uniaxial tension testing. The results showed that Mg-Zn-Al eutectic alloy solder had a strong bonding with carbon fibers and a noticeable diffusion with AZ31 alloy. No debonding was observed on the interface of carbon fibers, and no carbide was detected in this system. The bonding strength of composite laminate reached up to ～17.48MPa which was close to the bonding strength of AZ31/Al composite laminate. It was indicated that vibration assisting hot pressing was a feasible technique for the fabrication of Mg-based composite laminates reinforced with uncoated carbon fibers.

关键词： Composite laminates, Carbon fibers, AZ31, Mg-Zn-Al eutectic alloy solder, Hot pressing

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Theoretical studies on transforming a GaN semiconductor into a photonic crystal under a periodic external magnetic field

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Journal of Materials science 2012年第3期48卷 1147-1152页

作者： Suihu Dang Chunxia Li Peide Han Wei Jia Zhuxia Zhang Hua Zhang Jian Liang Husheng Jia Xuguang Liu Bingshe Xu Key Laboratory of Interface Science and Engineering in Advanced Materials College of Materials Science and Engineering Ministry of Education Taiyuan University of Technology Taiyuan China Department of Physics and Electronic & Information Engineering Yangtze Normal University Chongqing China

In this study, the properties of light propagation for a GaN semiconductor when subjected to a periodic external magnetic field were calculated by means of a transfer matrix. The dielectric function which was modulated periodically by the periodic external magnetic field caused changes of photonic band gap (PBG). In the reflection spectra, photons can be localized in the narrow bands. The position and intensity of PBGs can be modulated by changing the periodic external magnetic field and angle of the incident electromagnetic wave. All of these results have shown that a semiconductor has functions similar to conventional photonic crystals subjected to periodic external magnetic field.

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Liquid blending preparation and properties of multiwalled carbon nanotubes/polyamide 6 composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2012年第2期29卷 73-78页

作者： Xu, Lihua Qiu, Li Yang, Yongzhen Liu, Xuguang Xu, Bingshe Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan 030024 China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China Research Center on Advanced Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The composites of multiwalled carbon nanotubes/polyamide 6 (MWCNTs/PA6) were fabricated by liquid blending method. The effects of the modification methods and contents of MWCNTs on the thermal and crystal properties of MWCNTs/PA6 composites were studied. The composites were characterized by FESEM, FTIR, DSC, XRD and TG. The results show that the thermal stability of PA6 can be improved through adding MWCNTs, especially amino-functionalized MWCNTs (d-MWCNTs). When the mass fraction of d-MWCNTs reaches 7.5%, the crystallization degree of the MWCNTs/PA6 composites is improved from 48.09% to 56.62% and the entangled degree among polymer macromolecules is the lowest.

关键词： Liquids

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