Paraffin/carbon aerogel phase change materials with high enthalpy and thermal conductivity
Paraffin/carbon aerogel phase change materials with high enthalpy and thermal conductivity
复制标题
高焓高导热石蜡/碳气凝胶相变材料
DOI：
10.1080/1536383x.2017.1347638
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发表时间：
2017-09
影响因子：
2.3
通讯作者：
Juying Wu
中科院分区：
文献类型：
--
作者：
Benqiang Tian;Wenbin Yang;Fangfang He;Changqiong Xie;Kai Zhang;Jinghui Fan;Juying Wu
摘要 采用改进的水热法制备了石墨烯气凝胶（GA）和碳纳米管石墨烯气凝胶（CGA）两种碳气凝胶。通过将石蜡吸附到碳气凝胶中来制备形状稳定的相变材料（PCM）。通过扫描电子显微镜（SEM）、原位X射线衍射（in situ XRD）和差示扫描量热计（DSC）对形貌、结构、形状稳定性和热性能进行表征。结果表明，GA呈现出具有卷曲边缘的皱纹表面纹理，并且碳纳米管（CNT）散布或附着在GA片上。 GA/石蜡PCM复合材料的相变温度和相变焓分别为48.7℃和223.2J/g。碳气凝胶的加入使PCM复合材料的热性能和力学性能实现了质的飞跃。在碳气凝胶负载分数为 2 wt% 时，PCM 复合材料的导热率为约 2.182 W/m K。具有高导热率和高热函的形状稳定的PCM复合材料在建筑领域的热能存储应用中具有广阔的前景。
ABSTRACT Two kinds of carbon aerogels, graphene aerogels (GA) and carbon nanotubes-graphene aerogels (CGA), were prepared by modified hydrothermal method. The form-stable phase change materials (PCMs) were fabricated by adsorbing paraffin into carbon aerogels. Morphology, structure, form stability and thermal property were characterized by scanning electron microscope (SEM), in situ X-ray diffraction (in situ XRD) and differential scanning calorimeter (DSC). The results showed that GA presented wrinkled surface textures with curling edges, and carbon nanotubes (CNTs) were interspersed or attached to GA sheets. The phase transition temperature and the phase change enthalpy of the GA/paraffin PCM composite were 48.7 °C and 223.2 J/g, respectively. Thermal and mechanical properties of PCM composites achieved a qualitative leap with the adding of carbon aerogels. The PCM composites had a thermal conductivity of about 2.182 W/m K at the carbon aerogels loading fraction of 2 wt%. The form-stable PCM composites with high thermal conductivity and high enthalpy could be promising for thermal energy storage applications in construction field.
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