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Semi-template based,biomimetic-architectured,and mechanically robust ceramic nanofibrous aerogels for thermal insulation

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Nano Research 2022年第6期15卷 5581-5589页

作者： lvye dou Yang Si Jianyong Yu Bin Ding Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 200051China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Energy efficient buildings require novel thermal insulators accompanied by lightweight,mechanically robust,fire resistant,and low thermal *** fibrous aerogels have emerged as promising candidates,however it’s difficult for these materials to achieve exceptional mechanical and thermal insulation performance ***,we demonstrate a unique semi-template method to fabricate biomimetic-architectured silica/carbon dual-fibrous aerogel with robust mechanical ***,aerogels with honeycomb-like cellular and nanofiber/nanonet cell wall were constructed by freezedrying the homogeneous dispersion of SiO_(2)nanofibers and cellulose nanofibers *** is worth noting that the biomimetic structure has been perfectly inherited even subjected to high-temperature *** a result,the excellent structural stability brought by the novel structure enables the aerogel to completely recover under large compression and buckling strain of 80%,and exhibit robust fatigue resistance over 200,000 *** importantly,the aerogels exhibit ultralow thermal conductivity(0.023 W·m^(−1)·K^(−1)),superior flame retardancy,together with excellent thermal insulation performance over a wide temperature ranging from−196 to 350°*** fabrication of such materials may provide new ideas for the development of next-generation thermal insulators for harsh conditions.

关键词： silica nanofiber carbon nanonet biomimetic-architectured aerogel mechanically robust thermal insulation

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Nanonet-/fiber-structured flexible ceramic membrane enabling dielectric energy storage

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Journal of Advanced Ceramics 2023年第1期12卷 145-154页

作者： lvye dou Bingbing YANG Shun LAN Yiqian LIU Yuan-Hua LIN Ce-Wen NAN State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Ceramics are considered intrinsically brittle at macro scale due to the lack of slip mechanism and pre-existing defects,which greatly limits their potential applications in emerging fields including wearable electronic devices and flexible *** this contribution,we developed BiFeO_(3)/SiO_(2) dual-networks with exceptional flexibility through a coupled electronetting/electrospun *** hybrid nanostructured networks endow the material with high tensile strength(2.7 MPa),excellent flexibility(80%recoverable deformation),and robust fatigue resistance performance(maintain flexibility after a 1000-cyclic compress test).After in-situ compounded with dielectric polymer via a layer-by-layer solution casting method,the resultant three-dimensional(3D)composite film exhibits a twice higher dielectric constant(εr)than polyether imide(PEI)*** importantly,the breakdown strength of the 3D composite film is almost the same as that of the PEI film,resulting in an enhanced energy density of~6.0 J/cm^(3) and a high efficiency of 80%at 4.58 MV/*** unique structure,combined with the excellent balance between mechanical and dielectric properties in flexible structures,is of critical significance to the design of flexible functional ceramics and broadening their applications in wearable electric devices.

关键词： BiFeO_(3)/SiO_(2)dual-network flexible mechanically robust dielectric energy storage

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