Dispersion analysis of carbon nanotubes, carbon onions, and nanodiamonds for their application as reinforcement phase in nickel metal matrix composites
Dispersion analysis of carbon nanotubes, carbon onions, and nanodiamonds for their application as reinforcement phase in nickel metal matrix composites
复制标题
DOI：
10.1039/c5ra14310a
复制
发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Muecklich, F.
中科院分区：
文献类型：
--
作者：
Reinert, L.;Zeiger, M.;Muecklich, F.
使用均化器和超声波浴，改变处理时间，产生多壁碳纳米管、洋葱状碳和纳米金刚石在乙二醇中的分散体。然后将分散的颗粒用作镍基复合材料的增强相。选择这些纳米颗粒来代表不同的碳杂化状态（sp(2) 与 sp(3)）或不同的颗粒几何形状（0D 与 1D）。这样可以系统地研究指定差异对溶剂和复合材料中分散性的影响，以及机械增强效果。采用了一整套互补的分析方法，包括透射电子显微镜、拉曼光谱、动态光散射、沉降分析、zeta 电位测量、扫描电子显微镜、电子背散射衍射和维氏显微硬度测量。可以得出结论，在溶剂中可达到的最大分散等级是相似的，不会改变颗粒的结构完整性。然而，纳米金刚石表现出最好的分散稳定性，其次是洋葱状碳，最后是多壁碳纳米管。复合材料内颗粒的分布和团聚体尺寸与分散分析非常一致，最终与纳米金刚石的最大晶粒细化度和最大机械增强效果相关联，最大晶粒细化了 3 倍。
Dispersions of multi-wall carbon nanotubes, onion-like carbon, and nanodiamonds in ethylene glycol are produced using a homogenizer and an ultrasonic bath, altering the treatment time. The dispersed particles are then used as reinforcement phase for nickel matrix composites. These nanoparticles are chosen to represent different carbon hybridization states (sp(2) vs. sp(3)) or a different particle geometry (0D vs. 1D). This allows for a systematic investigation of the effect of named differences on the dispersibility in the solvent and in the composite, as well as the mechanical reinforcement effect. A comprehensive suite of complementary analytical methods are employed, including transmission electron microscopy, Raman spectroscopy, dynamic light scattering, sedimentation analysis, zeta-potential measurements, scanning electron microscopy, electron back scatter diffraction, and Vickers microhardness measurements. It can be concluded that the maximum achievable dispersion grade in the solvent is similar, not altering the structural integrity of the particles. However, nanodiamonds show the best dispersion stability, followed by onion-like carbon, and finally multi-walled carbon nanotubes. The distribution and agglomerate sizes of the particles within the composites are in good agreement with the dispersion analysis, which is finally correlated with a maximum grain refinement by a factor of 3 and a maximum mechanical reinforcement effect for nanodiamonds.