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Monodisperse silver microspheres: A facile BSA template method

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Science China(Technological Sciences) 2013年第10期56卷 2250-2258页

作者： YANG ATao ZHANG Jie LIANG ShuHua YANG ShengChun ding bingjun MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory for Mechanical Behavior of Materials School of Science Xi'an Jiaotong University School of Material Science and Engineering Xi'an University of Technology

The spherical silver mirco/nano-particles with narrow size distributions were obtained by chemical reduction of silver ammonia solution with ascorbic acid as reducing agent and bovine serum albumin (BSA) as bio-template. The effects of the concentration of Ag+ ions, BSA and ammonia, reactive temperature on the silver morphology and particle sizes were investigated. SEM, TEM and XRD were employed to characterize the morphology and structures of the prepared silver mirco/nano-particles. The results show that the spherical silver particle with smooth surface and narrow size distributions can be obtained by controlling the concentration of Ag+ ions, BSA, reaction temperature, etc. By controlling the above parameters, the silver spherical mirco/nano-particles with particle sizes ranging from 0.2 to 2.3 m can be well prepared, which is expected to be used in manufacturing high performance electronic pastes.

关键词： BSA bio-template ultrafine silver powder morphology and size control

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Arc erosion behavior of a nanocomposite W-Cu electrical contact material

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Rare Metals 2006年第1期25卷 37-42页

作者： CHEN Wenge KANG Zhanying SHEN Hongfang ding bingjun School of Materials Science and Engineering Xi＇an University of Technology Xi＇an 710048 China Department of Materials Physics Xi＇an Jiaotong University Xi＇an 710049 China

The erosion behavior of a nanocomposite W-Cu material under arc breakdown was investigated. The arc erosion rates of the material were determined, and the eroded surfaces and arc erosion mechanisms were studied by scanning eleclion microscopy. It is concluded that the nanocomposite W-Cu electrical contact material shows a characteristic of spreading arcs. The arc breakdown of a commercially used W-Cu alloy was limited in a few areas, and its average arc erosion rate is twice as large as that of the former. Furthermore, it is also proved that the arc extinction ability and arc stability of the nanocomposite W-Cu material are excellent, and melting is the major failure modality in the make-and-break operation of arcs.

关键词： arc erosion W-Cu alloy contact materials nanocomposite

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制备弥散强化铜的新工艺

稀有金属材料与工程 2000年第2期29卷 141-143页

作者：贾燕民丁秉钧浙江大学杭州310027 西安交通大学西安710049

采用溶胶—凝胶法和热压烧结相结合的新工艺制备超细 Al2 O3p弥散强化铜材料 ,并对其烧结态和退火态的显微组织和性能进行了观察与分析。结果表明 :用这种工艺制备的弥散强化铜材料具有高致密度、高强度、高电导率及高温热稳定性等优点 ... 详细信息

采用溶胶—凝胶法和热压烧结相结合的新工艺制备超细 Al2 O3p弥散强化铜材料 ,并对其烧结态和退火态的显微组织和性能进行了观察与分析。结果表明 :用这种工艺制备的弥散强化铜材料具有高致密度、高强度、高电导率及高温热稳定性等优点 ;Al2 O3p颗粒平均尺寸约 0 .1μm,颗粒间距 0 .3μm;90

关键词：弥散强化铜溶胶-凝胶热压烧结制备工艺

Microstructure Evolution of W-Cu Alloy Wire

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Materials Sciences and Applications 2012年第3期3卷 157-162页

作者： Fei Shao Wenge Chen Hui Zhang bingjun ding School of Materials Science and Engineering Xi’an University of Technology Xi’an China School of Science Xi’an Jiaotong University Xi’an China

Microstructure of W-Cu alloy wire before and after hot-swaging was studied in this paper. Results show that a homogeneous microstructure of the W-Cu alloy wire was formed after hot-swaging treatment, and the tungsten particles were embedded in copper phases to form a networking structure;the W-Cu alloy wire has a microstructure of body-centered-cubic tungsten particles and face-centered-cubic copper phase, and did not change after hot-swaging. The intermediate phases have not been found during the process, but the size of the tungsten particles in the copper matrix becomes smaller. After hot-swaging, the treated W-Cu alloy wire has a relative density of 105.1%, and a conductivity of 47.2% IACS, the tensile and bending strength can be as large as 644 and 1600 MPa, respectively.

关键词： Hot-Swaging Microstructure W-Cu Alloy Wire

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高强度自润滑涂层PM304的制备

稀有金属材料与工程 2008年第11期37卷 2031-2033页

作者：崔树茂丁春华杨志懋丁秉钧西安交通大学强度与振动教育部重点实验室陕西西安710049

通过高能球磨与粉末冶金技术制备高强度自润滑PM304涂层,PM304涂层相对密度达到93%、抗拉伸强度达47MPa,相比等离子喷涂制备的PS304涂层,相对密度与抗拉伸强度明显提高。并且,涂层中的自润滑成分尺寸细小且分布均匀,其中Cr2O3粒子尺寸为... 详细信息

通过高能球磨与粉末冶金技术制备高强度自润滑PM304涂层,PM304涂层相对密度达到93%、抗拉伸强度达47MPa,相比等离子喷涂制备的PS304涂层,相对密度与抗拉伸强度明显提高。并且,涂层中的自润滑成分尺寸细小且分布均匀,其中Cr2O3粒子尺寸为100nm左右,BaF2/CaF2粒子为1μm左右。

关键词： PM304 自润滑摩擦磨损

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纳米晶CuCr合金的制备及其截流值研究

稀有金属材料与工程 2005年第9期34卷 1439-1442页

作者：冯宇张程煜丁秉钧西安交通大学陕西西安710049

通过高能球磨和真空热压技术制备了致密度大于98%的纳米晶CuCr合金,通过XRD,SEM和TEM研究了其显微组织和结构.结果表明,其晶粒尺寸小于50 nm.在模拟电路上研究了其真空电弧稳定性和截流值,纳米晶CuCr合金的真空电弧稳定性好于常规CuCr合... 详细信息

通过高能球磨和真空热压技术制备了致密度大于98%的纳米晶CuCr合金,通过XRD,SEM和TEM研究了其显微组织和结构.结果表明,其晶粒尺寸小于50 nm.在模拟电路上研究了其真空电弧稳定性和截流值,纳米晶CuCr合金的真空电弧稳定性好于常规CuCr合金,其截流值为常规CuCr合金的17%～35%.

关键词：纳米晶CuCr 触头材料截流值

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纳米Cu阴极斑点短程有向运动分析

稀有金属材料与工程 2007年第1期36卷 68-70页

作者：苏亚凤杨志懋丁秉钧西安交通大学陕西西安710049

采用扫描电子显微镜(SEM)观察了纳米Cu阴极在峰值电流为10A的小击穿电流下首击穿后的阴极表面烧蚀形貌,发现纳米Cu的阴极斑点从产生到熄灭期间的运动(即短程运动)并不是随机的,而是有一定取向的;进一步通过和常规Cu首击穿烧蚀形貌对比,... 详细信息

采用扫描电子显微镜(SEM)观察了纳米Cu阴极在峰值电流为10A的小击穿电流下首击穿后的阴极表面烧蚀形貌,发现纳米Cu的阴极斑点从产生到熄灭期间的运动(即短程运动)并不是随机的,而是有一定取向的;进一步通过和常规Cu首击穿烧蚀形貌对比,分析了产生有向运动的原因。结果表明:纳米Cu阴极斑点的短程有向运动有利于电弧分散,细化晶粒是减轻烧蚀的一种途径。

关键词：纳米Cu 阴极斑点微蚀坑爆破性电子发射

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金属多孔材料应用及制备的研究进展

稀有金属材料与工程 2006年第A2期35卷 30-34页

作者：梁永仁杨志懋丁秉钧西安交通大学金属材料及强度国家重点实验室陕西西安710049

综述了金属多孔材料在作为结构材料和功能材料方面所表现出来的优异性能及其应用。并对固相法、液相法、电沉积法、气相沉积法等金属多孔材料的主要制备方法进行了总结,同时,指出当前金属多孔材料的研究热点和今后所需解决的问题。

关键词：金属多孔制备方法功能应用结构应用

Targeted knockdown of PGAM5 in synovial macrophages efficiently alleviates osteoarthritis

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Bone Research 2024年第1期12卷 215-226页

作者： Yuhang Liu Ruihan Hao Jia Lv Jie Yuan Xuelei Wang Churong Xu ding Ma Zhouyi Duan bingjun Zhang Liming Dai Yiyun Cheng Wei Lu Xiaoling Zhang Department of Orthopedic Surgery Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine(SJTUSM)Shanghai 200092China National Facility for Translational Medicine Shanghai 200240China Shanghai Frontiers Science Center of Genome Editing and Cell Therapy Shanghai Key Laboratory of Regulatory BiologySchool of Life SciencesEast China Normal UniversityShanghai 200241China Department of Orthopaedic Surgery The Second Hospital of Shanxi Medical UniversityTaiyuan 030001China CAS Key Laboratory of Tissue Microenvironment and Tumor Shanghai Institute of Nutrition and HealthChinese Academy of SciencesShanghai 200031China School of Medicine Shanghai UniversityShanghai 200444China

Osteoarthritis(OA)is a common degenerative disease worldwide and new therapeutics that target inflammation and the crosstalk between immunocytes and chondrocytes are being developed to prevent and treat *** attempts involve repolarizing pro-inflammatory M1 macrophages into the anti-inflammatory M2 phenotype in *** this study,we found that phosphoglycerate mutase 5(PGAM5)significantly increased in macrophages in OA synovium compared to controls based on histology of human samples and single-cell RNA sequencing results of mice *** address the role of PGAM5 in macrophages in OA,we found conditional knockout of PGAM5 in macrophages greatly alleviated OA symptoms and promoted anabolic metabolism of chondrocytes in vitro and in ***,we found that PGAM5 enhanced M1 polarization via AKT-mTOR/p38/ERK pathways,whereas inhibited M2 polarization via STAT6-PPARγpathway in murine bone marrow-derived ***,we found that PGAM5 directly dephosphorylated Dishevelled Segment Polarity Protein 2(DVL2)which resulted in the inhibition ofβ-catenin and repolarization of M2 macrophages into M1 *** knockout of both PGAM5 andβ-catenin in macrophages significantly exacerbated osteoarthritis compared to PGAM5-deficient *** by these findings,we successfully designed mannose modified fluoropolymers combined with siPGAM5 to inhibit PGAM5 specifically in synovial macrophages via intra-articular injection,which possessed desired targeting abilities of synovial macrophages and greatly attenuated murine ***,these findings defined a key role for PGAM5 in orchestrating macrophage polarization and provides insights into novel macrophage-targeted strategy for treating OA.

关键词： osteoarthritis metabolism inhibited