Programme PHC STAR 2019 (Projet PIONEER) : Micro-solid bubble assembly for ultralight, strong, and superelastic materials
Jeudi 19 décembre 2019 09:00
- Duree : 1 heure
Lieu : CEA, Bâtiment C5, Salle 421A - 17 rue des Martyrs - 38000 Grenoble
Orateur : Pil Jin YOO (Nano Materials & Nano Devices Lab, School of Chemical Engineering, SungKyunKwan University (SKKU), 300 cheon-cheon dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea)
Advanced materials with low density and high strength have transformative impacts in construction, aerospace and automobile industries. These materials are realized with integrating well-designed modular building units into interconnected structures. Here, we present a hierarchical design strategy to demonstrate a new class of carbon-based closed-cellular structures (CCS). The building units are prepared by a multi-scale approach starting from functionalized graphene oxide nanosheets, leading to the microfluidic synthesis of solid-shelled bubbles with shape diversity at the micro-scale, followed by the assembly into meso-scale 3D structures. Subsequently, these are transformed into self-interconnected and structurally-reinforced CCS, resulting in graphene lattices with rhombic dodecahedral honeycomb structures at the centimeter-scale. The 3D suprastructure simultaneously exhibits the Young’s modulus above 300 kPa while retaining a light density of 7.7 mg/cm3 and the elasticity against up to 80% of the compressive strain. The fabricated 3D CCS opens a new pathway for designing lightweight, strong, and superelastic materials.
References :
[1] Yeo, S. J., Oh, M. J. & Yoo, P. J. “Structurally controlled cellular architectures for high performance ultra-lightweight materials.” Adv. Mater. 30, 1803670 (2018).
[2] Yeo, S. J. & Yoo, P. J. et al. “Plesiohedral cellular network of graphene bubbles for ultralight, strong, and superelastic materials.” Adv. Mater. 31, 1802997 (2019).
[3] Ho, D. H. & Yoo, P. J. et al. “Ultra-lightweight strain-responsive 3D graphene network.” J. Phys. Chem. C. 123, 9884-9893 (2019).
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