偶氮苯
气凝胶
壳聚糖
保温
复合数
材料科学
吸收(声学)
热稳定性
热导率
化学工程
多孔性
复合材料
热的
聚合物
气象学
工程类
图层(电子)
物理
作者
Chuan-Yan Huang,Junfeng Feng,Guochen Li,Li-Guo Liao,Shuting Fan,Jiaxin Wang,Sheng Zhang,Bang‐Jing Li
标识
DOI:10.1016/j.cej.2022.141202
摘要
Active heat absorption strategy and passive heat insulation strategy often go their separate way, and each has its own advantages and disadvantages. This study explores a new thermal insulation material design strategy that introduces thermo-sensitive host–guest inclusion complexes as active heat-absorbing components in passive thermal insulation aerogel. According to this strategy, a novel azobenzene-modified chitosan/oligomeric β-cyclodextrin (CSAZO/CD) composite aerogels were prepared by the freeze-drying method. It was found that CSAZO/CD composite aerogels showed tunable porous structure, good mechanical properties and more importantly wonderful thermal insulation properties. Since CSAZO/CD aerogels contained not only porous structure (porosity 91.03%-95.85%), but also Azo-βCD complexes in the matrix as active heat-absorbing components, these materials showed better thermal insulation capability than other aerogels with similar thermal conductivity. And unlike classic porous material-supported phase change materials which suffer the leakage of PCM after multiple thermal cycles, CSAZO/CD composite aerogels show good long-term stability since the Azo-βCD complexes absorb heat by the solid-to-solid transition. Furthermore, CSAZO/CD composite aerogels showed even better thermal insulation behavior under UV irradiation. The unique insulation properties of CSAZO/CD aerogels make them good candidates for thermal insulation materials in many fields, such as ultra-thin thermal insulation in high temperature or UV environment.
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