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采用瞬态电热技术测量了5~6层纯石墨烯粉末中石墨烯的热扩散率,其值为1.15×10-5 m2/s,相应的导热系数为18.000 W/(m·K)。借助导热仪研究了不同密度下石墨烯粉末导热系数的变化情况,发现其导热系数与密度成正比。密度由0.02增加到0.22g/cm3时,导热系数总体提升了8.09%。另通过实验得到了含水率对石墨烯粉末导热性能的影响。实验结果显示,石墨烯粉末含水率由0.0%增加到99.8%的过程中,导热系数先是上升随后下降最终直线降至最低点(约为0.765~1.030 W/(m·K))。其中当含水率达到96.7%时,混合物(石墨烯与水)的导热系数提高了62.80%。该研究为石墨烯热应用及热管理提供了理论支撑。
The thermal diffusivities of graphene from 5 to 6 pure graphene powders were measured by means of transient electrothermal technique. The thermal diffusivities were 1.15 × 10-5 m2 / s and the corresponding thermal conductivity was 18.000 W / (m · K). With the help of the thermal conductivity meter, the thermal conductivity of graphene powders under different densities was studied. The thermal conductivity was directly proportional to the density. When the density increased from 0.02 to 0.22g / cm3, the overall thermal conductivity increased by 8.09%. In addition, the influence of moisture content on the thermal conductivity of graphene powder was also obtained experimentally. The experimental results show that the thermal conductivity increases first and then decreases and finally decreases to the lowest point (about 0.765 ~ 1.030 W / (m · K)) when the moisture content of graphene powder increases from 0.0% to 99.8%. When the moisture content reached 96.7%, the thermal conductivity of the mixture (graphene and water) increased by 62.80%. The research provides theoretical support for thermal applications and thermal management of graphene.