摘要
采用两步法,通过磁力搅拌和超声振荡,制备了以纳米石墨烯片GnPs为导热增强相的纳米GnPs/石蜡复合相变蓄热材料。红外光谱分析结果表明GnPs与石蜡之间未发生化学反应,仅是简单的物理复合作用。差示扫描量热分析(DSC)表明,复合材料的相变温度几乎保持不变,但其相变潜热随纳米GnPs含量的增加呈降低趋势,在质量分数为1%时,熔化和凝固过程的相变潜热较纯石蜡分别下降约9.6%和10.1%。此外,复合材料的导热系数随GnPs质量分数增加而增加,在质量分数为2%时,导热系数相对提高率为34.2%,表现出良好的强化导热效果。
Using nanographite （nano-GnPs） as the enhanced thermal conductivity fillers,nano-GnPs/paraffin phase change composite materials were prepared with a two-step method through the magnetic stirring and ultrasonic vibration. The infrared spectroscopy analysis showed that there was no chemical reaction between nano-GnPs and paraffin,just a physical interaction between them DSC results revealed that the phase change temperatures of nano-GnPs/paraffin were al- most constant. However, the latent heats of nano-GnPs/paraffin shifted to lower values compared to those of pure paraffin. For composites with 1 wt ~ nano-GnPs, the phase change latents with melting and solidification processes would be re- duced by 9.6% and 10. 1M, respectively. Meanwhile, the thermal conductivity of the composite PCMs shown to increase with the raising mass fraction. At the mass fraction of 2 %, the relative thermal conductivity enhancement was nearly 34. 2 %, which showed a favourable enhanced thermal conductivity results.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第7期105-107,共3页
New Chemical Materials
基金
国家自然科学基金(51206071)
中国博士后科学基金资助项目(2013M542125)
湖南省自然科学基金项目(13JJ6040)
关键词
石蜡
纳米石墨烯片
复合蓄热材料
相变潜热
导热系数
paraffin, nano-GnPs, heat storage composite material, phase change latent, thermal conductivity
