Abstract The multi-walled carbon nanotubes (MWCNTs) and Alumina (Al2O3) (CNT/Alumina) have been synthesized by two different simple methods including mechanical and chemical fabrication. The effect of the weight ratio of MWCNTs to Alumina on dispersion characteristic and thermal conductivity has been studied. To confirm that it is the success process, the morphological and structural investigations were carried out using transmission electron microscopy (TEM), Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), Raman spectroscopy. The whole results indicated that the chemical synthesized CNT/Al2O3 (c-CNT/Al2O3) were possessed good dispersion as compared to mechanical synthesized CNT/Al2O3 (m-CNT/Al2O3). However, for the dispersion stability, although c-CNT has higher value than m-CNT, m-CNT/Al2O3 were higher than c-CNT/Al2O3 for the nanofluid. The highest thermal conductivity enhancement was revealed when the weight ratio of (1:1) for the nanocomposite. The results were indicated that the synthesis methods were simple, environmentally-friendly and it has very effective characteristics than other chemical treatment.

中文翻译：

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提高碳纳米管/氧化铝纳米复合材料热特性的碱合成方法

摘要 多壁碳纳米管 (MWCNTs) 和氧化铝 (Al2O3) (CNT/Alumina) 已通过两种不同的简单方法合成，包括机械制造和化学制造。研究了 MWCNTs 与氧化铝的重量比对分散特性和热导率的影响。为了确认这是成功的过程，使用透射电子显微镜 (TEM)、傅里叶变换红外 (FTIR)、X 射线衍射 (XRD)、拉曼光谱进行了形态和结构研究。整体结果表明，与机械合成的 CNT/Al2O3 (m-CNT/Al2O3) 相比，化学合成的 CNT/Al2O3 (c-CNT/Al2O3) 具有良好的分散性。然而，对于分散稳定性，虽然 c-CNT 比 m-CNT 具有更高的值，对于纳米流体，m-CNT/Al2O3 高于 c-CNT/Al2O3。当纳米复合材料的重量比为 (1:1) 时，显示出最高的热导率增强。结果表明，该合成方法简单、环保，比其他化学处理方法具有非常有效的特点。