论文部分内容阅读
采用溶剂热法在240℃通过使乙酰丙酮铁在多壁碳纳米管/乙醇分散体系中热分解,原位得到了纳米Fe_3O_4粒子表面包覆的多壁碳纳米管(MWCNT@Fe_3O_4),并利用X射线衍射仪、扫描电子显微镜、热重分析仪、综合物性测量系统以及光学显微镜对其进行了表征。结果表明:当MWCNT和乙酰丙酮铁的配比为1∶2(质量比)时,纳米Fe_3O_4粒子在MWCNT@Fe_3O_4中的含量为29.6%(质量分数),其晶粒尺寸为22nm,形貌一致且粒径均匀,在MWCNT表面上分布均匀,无显著团聚现象;MWCNT@Fe_3O_4的饱和磁化强度达到29.87emu/g,在弱磁场(≤0.12T)诱导下,在环氧树脂中沿磁场方向发生定向排列,形成宽度为60μm左右的棒状结构。
The MWCNT @ Fe_3O_4 was coated on the surface of Fe_3O_4 nanoparticles by solvothermal method at 240 ℃ by thermal decomposition of Fe (II) acetylacetonate in a multi-walled carbon nanotube / ethanol dispersion system. X-ray diffraction, scanning electron microscopy, thermogravimetry, physical property measurement system and optical microscope. The results show that when the ratio of MWCNT to acetylacetonate is 1: 2 (mass ratio), the content of nano-Fe 3 O 4 particles in MWCNT @ Fe 3 O 4 is 29.6% (mass fraction) and the grain size is 22nm The MWCNT @ Fe 3 O 4 has a saturation magnetization of 29.87 emu / g, which is induced by the weak magnetic field (≤0.12T) in the direction of the magnetic field in the epoxy resin Oriented, forming a rod-shaped structure with a width of about 60 μm.