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Influence of modulation ratio on structure and properties of nanoscale ZrB_2.ZrAlN multilayered coatings

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Science china(Technological Sciences) 2010年第3期53卷 772-775页

作者： li dejun 1,KANG YuanBin 1,DONG Lei 1,{2. xiangyun 1,liU Hao 2.&SUN Xueliang 2.1college of physics and electronic Information Science,tianjin normal university,tianjin 300387,china 2.Department of Mechanical&Materials Engineering,{12. of Western Ontario,London ON,Canada 1. college of physics and {2. Information Science Tianjin Normal University Tianjin 300387 China2. Department of Mechanical & Materials Engineering University of Western Ontario London ON Canada

ZrB2.ZrAlN multilayered coatings with various modulation ratios(t ZrB2.t ZrAlN)and constant modulation periods were prepared by magnetron sputtering system at room ***,XRD,surface profiler and nano-indenter were employed to investigate the influences of tZ rB 2.tZrAlNon the microstructure and mechanical properties of the *** interfaces and nanoscale multilayered modulation were confirmed by *** multilayer with modulation period of 40 nm and ratio of 3:1 displayed the highest hardness(36.4 GPa)and critical fracture load(76.477 mN)with lower *** polycrystalline structure and multilayered modulate structure were directly responsible for the enhanced mechanical properties.

关键词： ZrB2.ZrAlN multilayered coating magnetron sputtering modulation ratio nanoscale

The effects of modulation period,modulation ratio,and deposition temperature on microstructure and mechanical properties of ZrB_2.W multilayers

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Science china(Technological Sciences) 2010年第9期53卷 2350-2354页

作者： liU MengYin,TAN Ming,liU GuangQing,{2. HaiYuan,XUE FengYing,deng xiangyun & li dejun college of physics and electronic Information Science,tianjin normal university,tianjin 300387,{12. 1. college of physics and {2. Information Science Tianjin Normal University Tianjin 300387 China

Monolithic ZrB2.W coatings and ZrB2.W multilayers with different modulation periods and modulation ratios were synthesized by ion beam assisted deposition at room temperature and 400°C.X-ray diffraction (XRD),scanning electron microscopy (SEM),surface profiler,and nanoindention were employed to investigate the influences of the deposition temperature and the modulation period on the growth,textures,interface structure,and mechanical properties of the *** results indicated that the multilayer with modulation period of 13 nm synthesized at room temperature possessed a higher hardness of 2..8 *** temperature gave a significant contribution to mechanical property *** 400°C-deposition temperature led to a maximum hardness and elastic modulus value of 32.1 and 399.1 GPa for ZrB2.W multilayer with a modulation period of 6.7 *** critical load increased to 42.8 mN and residual stress decreased to -0.7 GPa.A higher deposition temperature can cause an increase in interfacial atomic mixture and mobility of surface species,which induceds an increase in areal atomic density and dislocation *** results as well as small nanoscale grain sizes should be related to hardness increase.

关键词： ion beam assisted deposition nanoscale multilayers modulation period modulation ratio deposition temperature hardness

Adsorption and adhesion of blood proteins and fibroblasts on multi-wall carbon nanotubes

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Science china(life Sciences) 2009年第5期52卷 479-482页

作者： li dejun1, YUAN li1, YANG Ying1, deng xiangyun1, Lü XiaoYing2. HUANG Yan2. CAO Zheng2. liU Hao3 & SUN Xueliang3 1 college of physics and electronic Information Science, tianjin normal university, tianjin 300074, china 2.State Key Laboratory of Bioelectronics, Southeast university, Nanjing 2.0096, china 3 Department of Mechanical & Materials Engineering, university of Western Ontario, London, ON, Canada college of physics and {2. Information Science Tianjin Normal University Tianjin 300074 China State Key Laboratory of Bioelectronics Southeast University Nanjing 210096 China Department of Mechanical & Materials Engineering University of Western Ontario London ON Canada

This article concerns the investigation of blood protein adsorption on carbon paper and multi-wall carbon nanotubes (MWCNTs). Mouse fibroblast cell adhesion and growth on MWCNTs was also studied. The results showed that fibrinogen adsorption on carbon paper was much lower than that on MWCNTs, which means that platelets readily aggregate on the surface of MWCNTs. Mouse fibroblast cells implanted on MWCNTs tended to grow more prolifically than those implanted on carbon paper. The cell concentration observed on MWCNTs increased from 1.2.105/mL for a single day culture to 2.105/mL for a 7-day culture. No toxicity reaction was observed during the culturing period. These results indicated that MWCNTs possessed excellent tissue compatibility.

关键词： multi-wall carbon nanotubes cell adhesion protein adsorption toxicity tissue compatibility

Ferroelectricity of nanocrystalline BaTiO_3 ceramics by first principle calculation

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Chinese Science Bulletin 2010年第20期55卷 2182-2185页

作者： deng xiangyun ZHANG HaiTao {2. Ting {2. dejun {2. jianbao wang xiaohui {2. longtu Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources Materials and Chemical Engineering Institute Hainan University Haikou 570228 China college of physics and {2. Information Tianjin Normal University Tianjin 300387 China Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

The vibrational modes of BaTiO3 in different crystalline phases have been investigated by means of density functional theory pseudo potential *** evidence of tetragonal to orthorhombic and orthorhombic to rhombohedral phase transitions present for 8 nm BaTiO3 ceramics further demonstrates that the similar successive transitions in 8 nm BaTiO3 ceramics from rhombohedral to orthorhombic,tetragonal and cubic transitions are as those in coarse BaTiO3 ceramics.

关键词：钛酸钡陶瓷纳米钛酸钡第一性原理计算铁电性密度泛函理论振动模式赝势法相转变

Influence of Ar/N_2.Flow Rate on Structure and Property for TaN/NbN Multilayered Coatings

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Journal of Materials Science & Technology 2007年第4期23卷 461-464页

作者： Xuehua ZHANG Yuanbin KANG Sipeng liU Qiang li Ying YANG {2. deng dejun li college of physics and {2. Information Science Tianjin Normal University Tianjin 300074 China

TaN/NbN multilayered coatings with nanoscale bilayer periods were synthesized at different Ar/N2.flow rates by RF （radio frequency） magnetron sputtering. XRD （X-ray diffraction） and Nano Indenter System were employed to investigate the influence of Ar/N2.flow rate （FAr：FN2. on microstructure and mechanical properties of the coatings. The low-angle XRD pattern indicated a well-defined composition modulation and layer structure of the multilayered coating. All multilayered coatings almost revealed higher hardness than the rule-of-mixtures value of monolithic TaN and NbN coatings. At FAr：FN2.10, the multilayered coating possessed desirable hardness, elastic modulus, internal stress, and fracture resistance, compared with ones synthesized at other Ar/N2.flow rates. The layered structure with strong mixture of TaN （110）, （111）, （2.0） and Nb2. （101）textures should be related to the enhanced mechanical properties.

关键词： RF magnetron sputtering TaN/NbN multilayered coatings Nanoscale mechnical properties

In vitro comparison of the hemocompatibility of diamond-like carbon and carbon nitride coatings with different atomic percentages of N

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Science china(life Sciences) 2012年第4期55卷 343-348页

作者： ZHAO Mengli li {2. ZHANG YiTeng GUO MeiXian deng xiangyun GU HanQing WAN RongXin college of physics and {2. Information Science Tianjin Normal University Tianjin 300387 China tianjin Institute of Urological Surgery Tianjin Medical University Tianjin 300070 China

Carbon nitride （CN,） and diamond-like carbon （DLC） coatings were prepared by dc magnetron sputtering at room temperature. Different partial pressures of N2.were used to synthesize CNx to evaluate the relationship between the atomic percentage of ni- trogen and hemocompatibility. Auger electron spectroscopy and atomic force microscopy indicated atomic percentages of N of 0.12.and 0.2. and that the CNx coatings were smooth. An in vitro study of the hemocompatibility of the coatings revealed that both CNx coatings had better anticoagulant properties and lower platelet adhesion than DLC. Compared with CN0.1〉 the CN0.2. coating showed longer dynamic clotting time （about 42.min）, static clotting time （2..6 min） and recalcification time （45.6 s）, as well as lower platelet adhesion （102.cells μm-2., aggregation, and activation. The presence of nitrogen in the CNx coatings in- duced their enhanced hemocompatibility compared with DLC.

关键词： carbon nitride magnetron sputtering atomic percentage hemocompatibility

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钛酸钡纳米管阵列薄膜的合成及性能研究

中国陶瓷 2014年第3期50卷 8-11,15页

作者：廖昕星邓湘云王黎明刘鹏伟李建保海南大学材料与化工学院海南优势资源化工材料应用技术教育部重点实验室硅锆钛资源综合开发与利用海南省重点实验室海口570228 天津师范大学物理与电子信息学院天津300387 清华大学材料科学与工程学院北京100084

以阳极氧化法制备的TiO2.米管阵列为模板,结合水热法制备了钛酸钡纳米管阵列薄膜。研究了水热反应温度、反应时间对BaTiO3纳米管阵列薄膜表观形貌及电学性能的影响。样品经X射线衍射仪表征其晶体结构;扫描电子显微镜观察其微观形貌;以... 详细信息

以阳极氧化法制备的TiO2.米管阵列为模板,结合水热法制备了钛酸钡纳米管阵列薄膜。研究了水热反应温度、反应时间对BaTiO3纳米管阵列薄膜表观形貌及电学性能的影响。样品经X射线衍射仪表征其晶体结构;扫描电子显微镜观察其微观形貌;以及使用宽频介电阻抗谱仪测试了样品的介电性能。结果表明,在较低的水热温度下即可制得单一立方相的BaTiO3纳米管阵列薄膜,纳米管壁厚约30 nm,薄膜厚度可达10μm;水热反应温度的升高和反应时间的延长有助于样品的结晶度完善和介电性能的提高;未经热处理的薄膜样品在1 KHz介电常数可达2.0。

关键词：钛酸钡纳米管阵列薄膜水热合成表观形貌介电性能

Ce^(3+)掺杂钛酸钡纳米管薄膜的制备与性能

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材料导报 2018年第11期32卷 1924-1927页

作者：祝璐尹沛羊邓湘云李建保张伟金宏海南大学材料与化工学院南海海洋资源利用国家重点实验室海口570228 天津师范大学物理与电子信息学院天津300387 清华大学材料科学与工程学院北京100084

以阳极氧化制备的TiO_2.米管薄膜为模版,通过水热法制备了Ba_(1-x)Ce_xTiO_3(0≤x≤0.08)纳米管薄膜,研究了Ba_(1-x)Ce_xTiO_3的结构、表面形貌及其电性能。采用X射线衍射仪表征其晶体结构,采用扫描电子显微镜和透射电子显微镜观察其... 详细信息

以阳极氧化制备的TiO_2.米管薄膜为模版,通过水热法制备了Ba_(1-x)Ce_xTiO_3(0≤x≤0.08)纳米管薄膜,研究了Ba_(1-x)Ce_xTiO_3的结构、表面形貌及其电性能。采用X射线衍射仪表征其晶体结构,采用扫描电子显微镜和透射电子显微镜观察其表面及断口形貌,采用宽频介电阻抗谱仪测试其介电性能。结果表明,在较为温和的条件下用水热法成功制备出立方相结构的Ba_(1-x)Ce_xTiO_3纳米管薄膜,纳米管孔径在80~95nm之间;将制备的Ba_(1-x)Ce_xTiO_3经退火后生成多晶的Ba1-xCexTiO3纳米管薄膜,且样品的管外径尺寸在90~100nm之间,管壁的厚度为2.~30nm,介电常数在1kHz下最高可达472.介电损耗为0.41。

关键词： Ce3+掺杂BaTiO3 水热法纳米管薄膜表面形貌介电性能