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以石蜡和经硝酸处理过的碳纳米管(CNTs)为原料,苯为溶剂,采用真空渗透法制备了纳米胶囊相变材料,并通过透射电镜、红外光谱、差示热量(DSC)等测试方法对样品进行了表征。结果表明:石蜡成功填充到CNTs管内,且在CNTs管外基本没有残留的石蜡。石蜡填充CNTs的过程中,两者之间仅是物理结合,没有发生化学反应。由于CNTs的纳米受限空间作用,纳米胶囊相变材料的相变温度比纯石蜡降低了5℃,根据DSC测试得到相变潜热值,计算得到填充在CNTs中石蜡的质量分数为16.24%。此研究对于纳米胶囊相变材料在太阳能储存、微电子设备冷却和节能技术中的应用具有非常重要的意义。
The nanocapsule phase change material was prepared by vacuum infiltration method using paraffin wax and nitric acid-treated carbon nanotubes (CNTs) as raw materials and benzene as solvent. Through transmission electron microscopy, infrared spectroscopy and differential calorimetry (DSC) The samples were characterized. The results showed that paraffin wax was successfully packed into the CNTs tube, and there was almost no residual paraffin in the CNTs tube. In the process of paraffin-filled CNTs, the two are only physically combined and no chemical reaction takes place. Due to the nano-confined space effect of CNTs, the phase transition temperature of the nanocapsule phase change material is lower than that of the pure paraffin by 5 ℃. The latent heat of phase transition obtained from the DSC test results shows that the mass fraction of paraffin wax filled in the CNTs is 16.24%. This research is very important for the application of nanocapsule phase change materials in solar energy storage, micro-electronic equipment cooling and energy-saving technologies.