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3D printing-directed auxetic Kevlar aerogel architectures with multi-functionalizable properties

Cheng, Q; Liu, Y; Lyu, J; Lu, Q; Zhang, X; Song, W; (2020) 3D printing-directed auxetic Kevlar aerogel architectures with multi-functionalizable properties. Journal of Materials Chemistry A , 8 pp. 14243-14253. 10.1039/d0ta02590a. Green open access

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Abstract

Auxetic architectures with a negative Poisson’s ratio have attracted increasing attention due to their intriguing physical properties, numerous promising applications and recent advancements in manufacturing techniques. However, fabrication of three-dimensional (3D) polymeric auxetic architectures with tailored hierarchically porous structure and desired physical/mechanical properties remains challenging. Herein, 3D nanofibrous Kevlar aerogel architectures with porosity at multi-scales have been designed and fabricated through a new additive manufacturing strategy, i.e., integration of direct ink writing and freeze-casting with non-toxic solvent-based inks following special drying techniques. The highly porous 3D nanofibrous Kevlar aerogel architectures achieve excellent mechanical properties with ultralow density (down to 11.9 mg·cm-3) and large specific surface area (up to 350 m2·g-1). The Poisson’s ratio is tunable in a wide range, spanning from −0.8 to 0.4, by adjusting the spatial arrangement of the struts in geometries. Finally, these nanofibrous Kevlar aerogel architectures have been further functionalized into hydrophobic, luminescent and thermal-responsive architectures by using fluorocarbon resin, functional dyes and organic phase-change materials respectively. The multi-functionalizable auxetic aerogel architectures demonstrate potentials for a broad range of applications.

Type: Article
Title: 3D printing-directed auxetic Kevlar aerogel architectures with multi-functionalizable properties
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d0ta02590a
Publisher version: https://doi.org/10.1039/d0ta02590a
Language: English
Additional information: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. https://creativecommons.org/licenses/by-nc/3.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Surgical Biotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10103533
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