Preparation and thermal properties of nano copper decorated multi-walled carbon nanotubes/paraffin composites for phase-change actuation
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摘要: 以油胺为分散稳定剂, 在石蜡中热分解甲酸铜-碳纳米管复合物前驱体, 单步制备了纳米铜修饰多壁碳纳米管(Cu-MWCNTs)/石蜡复合材料。通过XRD、 TEM和DSC对Cu-MWCNTs/石蜡复合材料的物相、 微观形貌及相变行为进行了表征和分析, 并对其热敏性、 热膨胀性和热稳定性及影响因素进行了分析研究。结果表明: 纳米Cu原位沉积在MWCNTs外壁上, 粒径为2~35 nm。与纯石蜡相比, Cu-MWCNTs/石蜡复合材料的相变温度和相变潜热均明显降低。Cu-MWCNTs含量为0.2wt%的Cu-MWCNTs/石蜡复合材料具有较短的升温时间, 体膨胀率降低较小, 且多次加热后稳定性较好, 可作为此类热敏微驱动器的理想材料。Abstract: Nano copper decorated multi-walled carbon nanotubes(Cu-MWCNTs)/paraffin composites were synthesized by thermal decomposition of copper(II) formate-carbon nanotubes composite precursor in paraffin using oleylamine as dispersing agent. The phase structure, morphology and phase transition behavior were investigated by means of XRD, TEM and DSC. The thermal sensitivity, thermal expansion, thermal stability and their influencing factors of Cu-MWCNTs/paraffin composites were also studied. The results show that copper nanoparticles of 2-35 nm in size are attached to MWCNTs surface. The phase change temperature and latent heat of Cu-MWCNTs/paraffin composites significantly decrease as compared to that of the paraffin. It is clear that the Cu-MWCNTs/paraffin composites containing 0.2wt% of Cu-MWCNTs are desirable materials for microactuator, with short heating time, small decrease in volume expansibility and excellent thermal stability after being heated for many times.
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Key words:
- composites /
- nano copper /
- carbon nanotubes /
- paraffin /
- phase-change actuation /
- thermal decomposition method
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