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Micro-solid bubble assembly for ultralight, strong, and superelastic materials

Jeudi 19 décembre 2019 à 09:00
Salle de séminaire C5-421-A du CEA-Grenoble
Publié le 19 décembre 2019

​Par le Professeur Pil Jin Yoo
Nano Materials & Nano Devices Lab, School of Chemical Engineering
SungKyunKwan University (SKKU)
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.

The CEA-Grenoble site is a regulated access/restricted area. The access to the Blg C5/Room 421A is conditioned to a CEA badge request to be made NO LATER THAN Wednesday, Dec. 11, 2019 at 3:00 pm. Please contact Patrice Rannou  and send an electronic version of your passport/ID. Please do note that a valid ID (National ID card or passport only) will be required to collect your badge at the main entrance (Blg A2) of CEA- Grenoble (17 Avenue des martyrs, 38054 Grenoble Cedex 9). Last but not the least, do take into account that Blg C5 is located at a walking distance of ca. 10 min from the Blg A2 where you will collect your badge. Collecting your badge ca. 15-30 minutes before the start of the invited seminar is recommended.