摘要
为了探究两种不同二维纳米填料对复合相变材料导热系数的影响,分别制备了以石墨烯纳米片和六方氮化硼纳米片为填料的石蜡基复合相变材料。采用瞬态平面热源法在20℃时测量了不同添加量下复合相变材料的导热系数。结果显示,石蜡基复合相变材料的导热系数随纳米填料添加量近似线性增长;六方氮化硼纳米片对复合相变材料导热系数的提升远低于石墨烯纳米片。此外,利用基于有效介质模型的预测公式与试验值进行了比较,计算发现形状、大小和导热系数相近的两种纳米材料,六方氮化硼纳米片的界面热阻却高出石墨烯纳米片两个数量级,是后者具有更显著强化效果的原因之一。
Paraffin-based composite phase change materials （PCMs） were prepared by using graphene nanoplatelets （GNPs） and boron nitride nanosheets （BNNs）. Effective thermal conductivity of the PCM composites in solid state was measured at 20 ℃ using a transient plane source technique. It was shown that the thermal conductivity increased linearly with increasing particle loading for both nanofillers. The thermal conductivity enhancement of the GNPs/paraffin composites was found to be much higher than the BNNs/paraffin composites. The effective medium theory was used to analyse the thermal conductivity of the composites. It was found that, despite of similar shape, size and thermal conductivity of the two nanofillers, the calculated interracial thermal resistance of BNNs was two orders of magnitude higher than that of GNPs, which explained, at least partially, the observed better performance of the PCM composite containing GNPs.
出处
《储能科学与技术》
CAS
2014年第3期250-255,共6页
Energy Storage Science and Technology
基金
国家自然科学基金资助项目(51276159
51106144)
关键词
二维纳米填料
导热系数
复合相变材料
有效介质理论
界面热阻
2-D nanofillers
thermal conductivity
composite PCMs
effective medium model
thermal interface resistance
