Divalent metal-ions blowing strategy achieved 3D luffa aerogels heterostructure for lightweight broadband microwave absorber.

Explicitly, effective dispersion configuration and hierarchical network construction are two practicable measures to develop the broadband and lightweight absorbers. Based on the newly developed sugar blowing art, 3D Luffa aerogels heterostructure have been successfully developed through metal ion assisted caramel blowing (MCB) strategy. The Luffa foam hierarchical configuration with those dielectric, magnetic, and porous interfaces can be all achieved. Such hierarchical 3D lightweight aerogels are facilitated to building effective impedance matching networks (2.4 wt %) and exhibit an optimized polarization relaxation. Thus, the effective absorbing bandwidth (EAB) of the Luffa aerogel can be broadened up to 8.0 GHz. Moreover, the MCB strategy can be applicable to a wide range of divalent metal ions (Co2+, Ni2+, Mn2+, Zn2+ et al.). This study provides a new method for efficient synthesis of aerogel network structures and opens a way to realize lightweight and broadband electromagnetic wave absorbing (EWA) materials. Divalent metal ions assisted blowing strategy regulated 3D Luffa aerogels heterostructure were developed to achieve full-band EMW absorption at an ultra-low filling of 2.4 wt %. [Display omitted] • Metal ion assisted caramel blowing (MCB) aerogels have been successfully developed. • The Luffa foam hierarchical configuration was constructed without hard agglomeration. • The MCB strategy can be applicable to a wide range of divalent metal ions. • Such Luffa foam heterostructure exhibited an optimized polarization relaxation. • Such hierarchical 3D lightweight aerogels are facilitated to building effective impedance matching networks (2.4 wt %). • The EAB of luffa aerogel can expanded to 8.0 GHz. [ABSTRACT FROM AUTHOR]