A Plesiohedral Cellular Network of Graphene Bubbles for Ultralight, Strong, and Superelastic Materials

Title
A Plesiohedral Cellular Network of Graphene Bubbles for Ultralight, Strong, and Superelastic Materials
Authors
권석준여선주오민준전현민이민환배중건김예슬박경진이승우이대연원병묵이원보유필진
Keywords
Cellular network; graphene; superelastic; ultrastrong; ultralight; porous structure
Issue Date
2018-11
Publisher
Advanced materials
Citation
VOL 30, NO 45-1802977-7
Abstract
Advanced materials with low density and high strength impose transformative impacts in the construction, aerospace, and automobile industries. These materials can be realized by assembling well-designed modular building units (BUs) into interconnected structures. This study uses a hierarchical design strategy to demonstrate a new class of carbon-based, ultralight, strong, and even superelastic closed-cellular network structures. Here, the BUs are prepared by a multiscale design approach starting from the controlled synthesis of functionalized graphene oxide nanosheets at the molecular- and nanoscale, leading to the microfluidic fabrication of spherical solid-shelled bubbles at the microscale. Then, bubbles are strategically assembled into centimeter-scale 3D structures. Subsequently, these structures are transformed into self-interconnected and structurally reinforced closed-cellular network structures with plesiohedral cellular units through post-treatment, resulting in the generation of 3D graphene lattices with rhombic dodecahedral honeycomb structure at the centimeter-scale. The 3D graphene suprastructure concurrently exhibits the Young's modulus above 300 kPa while retaining a light density of 7.7 mg cm-3 and sustaining the elasticity against up to 87% of the compressive strain benefiting from efficient stress dissipation through the complete space-filling closed-cellular network. The method of fabricating the 3D graphene closed-cellular structure opens a new pathway for designing lightweight, strong, and superelastic materials.
URI
http://pubs.kist.re.kr/handle/201004/68129
ISSN
0935-9648
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KIST Publication > Article
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