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.
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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.
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