首页 | 本学科首页   官方微博 | 高级检索  
     

磁性Fe3O4/Ag复合纳米粒子制备与抗菌性能
引用本文:贺全国,刘 军,黄春艳,吴 伟.磁性Fe3O4/Ag复合纳米粒子制备与抗菌性能[J].稀有金属材料与工程,2013,42(8):2169-2173.
作者姓名:贺全国  刘 军  黄春艳  吴 伟
作者单位:西北工业大学凝固技术国家重点实验室,陕西西安,710072
摘    要:采用箔-纤维-箔法和1150℃/150 MPa/30 min的真空热压工艺成功制备了SiCf/Ti-43Al-9V复合材料,并使用金相显微镜、X射线衍射仪、扫描电镜及能谱仪对该复合材料微观组织的形成进行了研究.结果表明,制备过程中SiC纤维与TiAl基体合金发生反应,并形成一定厚度的反应层;基体组织为等轴晶,粒径约为8 μm,与原始合金组织相比明显细化;从反应层到远处的TiAl基体合金,基体合金的组织由全γ相转变为α2/γ片层组织、γ晶粒和晶间B2相的混合组织.其中全γ相区域的厚度为2~4 μm,并围绕纤维分布.根据Ti-Al-V相图、C原子和V原子的扩散,分析了这两个基体区域的形成机理,并结合热压成形过程中的塑性变形和变形储存能,解释了基体合金晶粒大小的变化.

关 键 词:复合材料  γ-TiAl  SiC纤维  微观组织  热压
收稿时间:2012/11/1 0:00:00

Preparation and Antibacterial Activity of Magnetic Fe3O4/Ag Composite Nanoparticles
He Quanguo,Liu Jun,Huang Chunyan and Wu Wei.Preparation and Antibacterial Activity of Magnetic Fe3O4/Ag Composite Nanoparticles[J].Rare Metal Materials and Engineering,2013,42(8):2169-2173.
Authors:He Quanguo  Liu Jun  Huang Chunyan and Wu Wei
Affiliation:Green Packaging and Biological Nanotechnology Laboratory, Hunan University of Technology, Zhuzhou 412007, China
Abstract:Magnetic composite nanoparticles Fe3O4/Ag were prepared by adding silver acetate into (3-aminopropyl)triethoxysilane (APTES)-coated Fe3O4 nanoparticles solution, silver ions were absorbed on the surface and formed a coordination compound with amino groups, and finally the complexed silver ions were reduced by sodium formate to generate magnetic Fe3O4/Ag composite nanoparticles. The morphology, microstructure, composition and magnetic properties of the Fe3O4/Ag nanoparticles were characterized by ultraviolet-visible spectroscopy (UV-Vis), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and superconducting quantum interference device (SQUID) magnetometry. And the antibacterial activities of the composites were investigated by E. coli and S. aureus as test bacterial spawn. The results show that as-obtained magnetic silver-containing nanoparticles possess a saturation magnetization (Ms) of about 2.0 (A·m2)/kg, and their average diameter is about 30 nm; meanwhile, the antibacterial tests show the composites demonstrate great antibacterial activity for restraining these two bacteria. Under controlled experiments, the number of these two bacteria id both under 0.11×103 (CFU) after 24 h test. Further test by adding more nanocomposites could sterilize nearly 100% of the E. coli. The magnetic and antibacterial nanocomposite fabrication process provides a good example for preparing novel biological antibacterial material, which is sensitively responded to external field (such as magnetic field
Keywords:composites  γ-TiAl  SiC fiber  microstructure  hot-pressing
本文献已被 万方数据 等数据库收录!
点击此处可从《稀有金属材料与工程》浏览原始摘要信息
点击此处可从《稀有金属材料与工程》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号