Technological watch

Light?weight structural materials with a unique combination of high stiffness, strength, toughness, and hardness, are highly?desired yet challenging to be artificially fabricated. Biological structural materials, on the other hand, ingeniously integrate multiple mutually exclusive mechanical properties together relying on their hierarchically heterogeneous structures bonded with gradient interfaces. Here, we report a scalable bottom?up approach combining continuous nanofiber?assisted evaporation?induced self?assembly with laminating, pressure?less sintering and resin infiltration to fabricate bio?inspired heterogeneous ceramic?resin composites with locally?tunable microstructure to fulfill specific properties. A gradient interlayer was  introduced to provide gradual transition between adjacent heterogeneous layers, effectively alleviating their property mismatch. The optimized heterogeneous nacre?like composite, as a demonstration, exhibit an attractive combination of low density (?2.8 g cm?3), high strength (?292 MPa), toughness (?6.4 MPa m1/2), surface hardness (?1144 kgf mm?2) and impact?resistance, surpassing the overall performance of engineering alumina. This material?independent approach paves the way for designing advanced bio?inspired heterogeneous materials for diverse structural and functional applications.This article is protected by copyright. All rights reserved