采用溶液混合法、真空吸附法和真空混合法这3种方法制备了石墨烯纳米片/石蜡复合定型相变材料,通过热性能分析得出最佳的制备方法。结果表明:溶液混合法制备的样品效果最好:热循环次数达到6次时,样品的质量损失率在1%以下;石墨烯纳米片可吸附84.67%的石蜡而不发生泄露;熔化和凝固潜热较纯石蜡分别降低了17.4%和10.9%,但与理论值相差不大;热导率为3.16W/(m·K),较纯石蜡提高了11.64倍。该复合材料的光热转换效率可达67.39%,比纯石蜡提高了42.52%。
Graphene(rGO) nanoplatelets/paraffin form-stable phase change materials(PCMs) were prepared by solution mixing method,vacuum adsorption method and vacuum mixing method.The most suitable preparation method was obtained by thermal properties analysis.The results showed that the solution mixing method was the best preparation method.When the number of thermal cycles reached 6,the mass loss rate of the sample could be less than 1%.The maximum mass percentage of paraffin absorbed by rGO nanosheets was 84.67% without leakage.Compared with pure paraffin,the melting and solidification latent heat of the composite decreased by 17.4% and 10.9%,respectively.However,they were close to the theoretical values.The thermal conductivity was 3.16W/(m·K),which was 11.64 times higher than that of pure paraffin.In addition,the light-to-thermal conversion efficiency of the composite was 67.39%,which was 42.52% higher than that of pure paraffin.
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基金资助
国家自然科学基金(51206071);湖南省自然科学基金项目(2019JJ40284)
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