低温SiO_2气凝胶基复合相变材料的制备与性能分析
Preparation and performance analysis of low-temperature SiO_2aerogel-based phase change composites
查看参考文献34篇
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文摘
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以SiO_2气凝胶为支撑材料,通过物理吸附法制备定形SiO_2气凝胶基复合相变材料(PCCs),再利用密封盒进行二次封装。探究SiO_2气凝胶与相变材料的最佳配比,并对复合相变材料的微观结构、化学成分、孔结构、相变特性、热可靠性、定形能力和隔热性能进行表征。结果表明:含有质量分数为80%相变材料的SiO_2气凝胶复合相变材料(LS-80)具有最佳吸附比,并且在相变过程中显示了良好的定形能力,其熔点和熔融潜热分别为-15.6℃和170.2J/g;同时SiO_2气凝胶的成功吸附使得LS-80的比表面积、孔径和孔容大小下降至59m~2/g,13nm和0.2cm~3/g;20次冷热循环后,封装后相变材料的相变潜热减少了13.4%,而SL-80只减少了2.8%,表现出良好的热可靠性能;SiO_2气凝胶的添加使得复合相变材料导热系数降低,隔热能力增强。该结果为SiO_2气凝胶复合相变材料在冷链物流领域的应用提供了实验依据。 |
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其他语种文摘
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Shape-stabilized SiO_2aerogel phase change composites(PCCs)was prepared by physical adsorption method with SiO_2aerogel as support material,and then used for secondary packaging.The optimal adsorption ratio of SiO_2aerogel and phase change materials was explored,and microscopic morphology,chemical composition,pore structure,phase change characteristics,thermal reliability, shape stability and thermal insulation performance of composites were also characterized.The results show that the PCCs with 80%(mass fraction)phase change material(LS-80)has the optimization proportion,the composites exhibit shape-stability during the phase change process,and the melting point and melting enthalpy are-15.6 ℃ and 170.2J/g respectively.The successful adsorption of SiO_2aerogel makes the specific surface area,pore size and pore volume of LS-80reduced to 59m~2/g, 13nm and 0.2cm~3/g.After 20thermal cycles,the latent heat of packaged phase change material is decreased by 13.4%,while the SL-80is only decreased by 2.8%,which proves good thermal reliability.Besides,the thermal conductivity of the composites is reduced and the thermal insulation capacity is enhanced due to the addition of SiO_2aerogel.The results provide experimental basis for the application of SiO_2aerogel PCCs in the field of cold chain logistics. |
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来源
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材料工程
,2022,50(8):115-123 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.000407
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关键词
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相变材料
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SiO_2气凝胶
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定形复合相变材料
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储冷
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地址
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厦门大学材料学院, 福建省特种先进材料重点实验室, 福建, 厦门, 361005
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中国航发沈阳发动机研究所, 沈阳, 110015
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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能源与动力工程 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:7308149
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