Supramolecular metallic foams with ultrahigh speci?cstrength and sustainable recyclability
作者：Xin Yang1,Xin Huang1,Xiaoyan Qiu1,Quanquan Guo 2 &Xinxing Zhang 1
關鍵字：Sustainable recyclability，Metallic foams
論文來源：期刊
發表時間：2024年
Porous materials with ultrahigh speci?cstrength are highly desirable for
aerospace, automotive and construction applications. However, because of
the harsh processing of metal foams and intrinsic low strength of polymer
foams, both are dif?cult to meet the demand for scalable development of
structural foams. Herein, we present a supramolecular metallic foam (SMF)
enabled by core-shell nanostructured liquid metals connected with high-
density metal-ligand coordination and hydrogen bonding interactions,
which maintain ?uid to avoid stress concentration during foam processing
at subzero temperatures. The resulted SMFs exhibit ultrahigh speci?c
strength of 489.68 kN m kg?1 (about 5 times and 56 times higher than alu-
minum foams and polyurethane foams) and speci?cmodulus of 281.23 kN m
kg?1 to withstand the repeated loading of a car, overturning the previous
understanding of the dif?culty to achieve ultrahigh mechanical properties in
traditional polymeric or organic foams. More importantly, end-of-life SMFs
can be reprocessed into value-added products (e.g., ?bers and ?lms) by facile
water reprocessing due to the high-density interfacial supramolecular
bonding. We envisage this work will not only pave the way for porous
structural materials design but also show the sustainable solution to plastic
environmental risks