Issue 5, 2022

Gradient adhesion modification of polyacrylamide/alginate–calcium tough hydrogels

Abstract

Strong hydrogel adhesion requires the synergy of adhesion and cohesion. Gradient adhesive–tough hydrogels can balance adhesion and cohesion, however, their construction is still a challenging task. Here, we used ethylenediaminetetraacetic acid (EDTA) on-side coordination-induced diffusion chelating Ca2+ to form an adhesive surface in a polyacrylamide/alginate–calcium (PAAm/Alg–Ca2+) tough hydrogel as a facile method for the construction of gradient adhesive–tough hydrogels. The adhesion energy of a gradient adhesive–tough hydrogel to skin is increased by 128% compared with PAAm/Alg–Ca2+ tough hydrogels and the elongation at break is two times higher than that of PAAm/Alg hydrogels. In addition, gradient adhesive–tough hydrogels also exhibit wide linear sensitivity (the gauge factor (GF) = 0.196 (0% < ε < 400%); GF = 0.260 (400% < ε < 650%)) as a wearable strain sensor to monitor human motions. This work provides a versatile strategy for the design of gradient adhesive–tough hydrogels and also provides a practical model for the development of wearable strain sensors.

Graphical abstract: Gradient adhesion modification of polyacrylamide/alginate–calcium tough hydrogels

Supplementary files

Article information

Article type
Paper
Submitted
25 Nov. 2021
Accepted
20 Dec. 2021
First published
20 Dec. 2021

J. Mater. Chem. B, 2022,10, 757-764

Gradient adhesion modification of polyacrylamide/alginate–calcium tough hydrogels

W. Zhang, Y. Zhang, Y. Dai, F. Xia and X. Zhang, J. Mater. Chem. B, 2022, 10, 757 DOI: 10.1039/D1TB02599F

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