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Issue 25, 2019
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Hierarchical chemomechanical encoding of multi-responsive hydrogel actuators via 3D printing

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Abstract

Inspired by nature, we herein demonstrate a family of multi-responsive hydrogel-based actuators that are encoded with anisotropic swelling behavior to provide rapid and controllable motion. Fabrication of the proposed anisotropy-encoded hydrogel actuators relies on the high resolution stereolithography 3D printing of functionally graded structures made of discrete layers having different volume expansion properties. Three separate synthetic strategies based on (i) asymmetrical distribution of a layer's surface area to volume ratio via mechanical design, (ii) crosslinking density via UV photo-exposure, or (iii) chemical composition via resin vat exchange have been accordingly demonstrated for developing very smooth gradients within the printed hydrogel-based actuator. Our chemomechanical programming enables fast, reversible, repeatable and multimodal bending actuation in response to any immediate environmental change (i.e. based on osmotic pressure, temperature and pH) from a single printed structure.

Graphical abstract: Hierarchical chemomechanical encoding of multi-responsive hydrogel actuators via 3D printing

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Supplementary files

Article information


Submitted
03 Apr 2019
Accepted
30 May 2019
First published
30 May 2019

J. Mater. Chem. A, 2019,7, 15395-15403
Article type
Paper
Author version available

Hierarchical chemomechanical encoding of multi-responsive hydrogel actuators via 3D printing

J. Odent, S. Vanderstappen, A. Toncheva, E. Pichon, T. J. Wallin, K. Wang, R. F. Shepherd, P. Dubois and J. Raquez, J. Mater. Chem. A, 2019, 7, 15395
DOI: 10.1039/C9TA03547H

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