Fabrication of a novel nano phase change material emulsion with low supercooling and enhanced thermal conductivity
Fabrication of a novel nano phase change material emulsion with low supercooling and enhanced thermal conductivity
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DOI：
10.1016/j.renene.2019.11.044
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发表时间：
2020-05
期刊：
影响因子：
8.7
通讯作者：
Guanhua Zhang;Zhen Yu;Guomin Cui;Binlin Dou;W. Lu;Xiaoyu Yan
中科院分区：
文献类型：
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作者：
Guanhua Zhang;Zhen Yu;Guomin Cui;Binlin Dou;W. Lu;Xiaoyu Yan
以正十八烷为相变材料，多壁碳纳米管为高导热材料，十八醇为成核剂，采用超声乳化法制备了一种新型的低过冷度高导热纳米相变材料乳液。用扫描电子显微镜、透射电子显微镜、粒度分析仪、差示扫描量热仪和热导仪对不同浓度的碳纳米管和十八醇制备的纳米乳液的表征和热性能进行了测试和分析。结果表明，制备的纳米乳液具有稳定性好、过冷度低、导热系数高等特点。在纳米乳液中加入1wt%的多壁碳纳米管，其热导率提高了4.32%。添加1wt%十八醇后，20wt%纳米乳液的过冷度由17.3℃降至11.0℃，降幅为36.4%。可以看出，所制备的纳米乳液可以作为传热和储能流体使用，在热力系统中具有很大的应用潜力。
A novel nano phase change material emulsion (NPCE) with low supercooling and high thermal conductivity was prepared by sonication method.N-octadecane was employed as phase change material, multi-walled carbon nanotubes (MWCNTs) were utilised as high thermal conductivity material, and octadecanol was utilised as nucleating agent. The characterization and thermal properties of the nanoemulsions prepared with various concentrations of MWCNTs and octadecanol were measured and analysed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size analyser, differential scanning calorimeter (DSC) and thermal conductivity meter. The results indicated that the nanoemulsions prepared had great stability, low supercooling and enhanced thermal conductivity. The thermal conductivity was enhanced by 4.32% for 10 wt% nanoemulsion with addition of 1 wt% MWCNTs. The supercooling degree of 20 wt% nanoemulsion was decreased by 36.4% from 17.3 °C to 11.0 °C with addition of 1 wt% octadecanol. It can be concluded that the nanoemulsions prepared were able to be utilised as heat transfer and energy storage fluids, with great potential in thermal system applications.