writer：Xin Yang1,Xin Huang1,Xiaoyan Qiu1,Quanquan Guo 2 &Xinxing Zhang 1
keywords：Sustainable recyclability，Metallic foams
source：期刊
Issue time：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