“Stiff–Soft” Binary Synergistic Aerogels with Superflexibility and High Thermal Insulation Performance
“Stiff–Soft” Binary Synergistic Aerogels with Superflexibility and High Thermal Insulation Performance
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DOI：
10.1002/adfm.201806407
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发表时间：
2019-02
影响因子：
19
通讯作者：
Junyan Zhang;Yanhua Cheng;M. Tebyetekerwa;Si Meng;Meifang Zhu;Yunfeng Lu
中科院分区：
文献类型：
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作者：
Junyan Zhang;Yanhua Cheng;M. Tebyetekerwa;Si Meng;Meifang Zhu;Yunfeng Lu
设计兼具高隔热性能和优异机械鲁棒性的气凝胶材料对于高级集成能源管理系统的应用具有极大的意义。为了满足上述要求，人们报道了基于分层“硬-软”二元网络的复合气凝胶，其中由细菌纤维素纳米纤丝网络交织的次级介孔聚甲基倍半硅氧烷结构域串联连接。所得复合气凝胶具有高孔隙率（93.6%）和纳米结构，表面积为660 m2 g−1，具有优异的隔热性能，导热系数低至15.3 mW m−1 K−1。一体化的“刚软”二元性质也赋予了复合气凝胶具有高柔韧性，可以贴合各种基材，并且具有较大的拉伸强度，可以承受超过自身重量的2.70×104倍。这些复合气凝胶在高效耐磨保护、可控热管理和超快油/水分离方面表现出多功能性。这些有利的多功能特性使复合气凝胶成为航空航天、工业和商业应用的理想选择。
Designing aerogel materials featuring both high thermal insulation property and excellent mechanical robustness is of great interest for applications in superior integrated energy management systems. To meet the above requirements, composite aerogels based on hierarchical “stiff–soft” binary networks are reported, in which secondary mesoporous polymethylsilsesquioxane domains intertwined by bacterial cellulose nanofibrillar networks are connected in tandem. The resulting composite aerogels are characterized by highly porous (93.6%) and nanosized structure with a surface area of 660 m2 g−1, leading to the excellent thermal insulation performance with a low thermal conductivity of 15.3 mW m−1 K−1. The integrated “stiff–soft” binary nature also endows the composite aerogels with high flexibility that can conform to various substrates as well as large tensile strength that can withstand more than 2.70 × 104 times its own weight. These composite aerogels show multifunctionality in terms of efficient wearable protection, controllable thermal management, and ultrafast oil/water separation. These favorable multifeatures present composite aerogels ideal for aerospace, industrial, and commercial applications.