Issue 41, 2022

Multifunctional gradient hydrogel with ultrafast thermo-responsive actuation and ultrahigh conductivity

Abstract

Bioinspired hydrogels with both outstanding actuation and conductivity still remain challenging. Here, we use a simple and universal method to fabricate an octopus-tentacle inspired multifunctional gradient hydrogel with both ultrafast thermo-responsive actuation and ultrahigh conductivity. The gradient network structure, formed by rapid precipitation of nanosilver flakes producing hydrophilic differences between two sides within the hydrogel, endows the hydrogel with ultrafast actuation (52.3° s−1). In addition, nanosilver flakes also provide the hydrogel with ultrahigh conductivity (>1231 S m−1) due to the formation of conductive pathways by rapid hydrogel volume shrinkage under thermal stimulation. Meanwhile, the hydrogel exhibits high sensitivity (gauge factor 14.66 within a wide strain range of 500%) and strong antibacterial properties. With these great properties, we firstly assemble the hydrogel as soft actuators (gripper and jack), where the gripper can firmly grasp and release the target object within only 8 s and 1 s, respectively. Secondly, we use the hydrogel as a wearable electronic device that enables precise detection of human motion and physiological signals. Finally, we realize smart circuit switches by combining great actuation and conductivity. Our multifunctional hydrogel offers promising opportunities for intelligent biomaterials, soft robotics and flexible sensors.

Graphical abstract: Multifunctional gradient hydrogel with ultrafast thermo-responsive actuation and ultrahigh conductivity

Supplementary files

Article information

Article type
Paper
Submitted
21 Jul 2022
Accepted
12 Sep 2022
First published
13 Sep 2022

J. Mater. Chem. A, 2022,10, 21874-21883

Multifunctional gradient hydrogel with ultrafast thermo-responsive actuation and ultrahigh conductivity

H. Liu, X. Jia, R. Liu, K. Chen, Z. Wang, T. Lyu, X. Cui, Y. Zhao and Y. Tian, J. Mater. Chem. A, 2022, 10, 21874 DOI: 10.1039/D2TA05770K

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