The properties of mechanical metamaterials such as strength and energy absorption are often “locked” upon being manufactured. While there have been attempts to achieve tunable mechanical properties, state-of-the-art approaches still cannot achieve high strength/energy absorption with versatile tunability simultaneously. Herein, we fabricate for the first time, 3D architected organohydrogels with specific energy absorption that is readily tunable in an unprecedented range up to 5 × 10 3 (from 0.0035 to 18.5 J g −1) by leveraging on the energy dissipation induced by the synergistic combination of hydrogen bonding and metal coordination. The 3D architected organohydrogels also possess anti-freezing and non-drying properties facilitated by the hydrogen bonding between ethylene glycol and water. In a broader perspective, this work demonstrates a new type of architected metamaterials with the ability to produce a large range of mechanical properties using only a single material system, pushing forward the applications of mechanical metamaterials to broader possibilities.
The first fabrication of 3D architected organohydrogels by Digital Light Processing
Two-step toughening effect of organohydrogels by metal coordination and hydrogen bonding
3D structures achieved ultra-tunable range of specific energy absorption up to 5000 x
3D architected organohydrogels were demonstrated as tunable impact attenuators
Soft matter; Mechanical property; Metamaterials