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Issue 25, 2012
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Zinc ion-triggered two-way macro-/microscopic shape changing and memory effects in high strength hydrogels with pre-programmed unilateral patterned surfaces

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Abstract

We demonstrate that dipole–dipole reinforced (DDR) high-strength hydrogels with pre-programmed unilateral patterned surfaces exhibit a two-way reversible shape-changing and memory effect caused by dynamic association and dissociation of CN–CN dipole–dipole pairings uniquely responding to zinc ions. The curling geometry of the gel can be controlled by the direction of the stripes on the surface of the DDR hydrogel. Interestingly, annealing is shown to facilitate folding of hydrogel; especially annealing at selective regions of one single gel leads to a more complex shape changing effect. More strikingly, surface wrinkling can be conveniently generated by heat treatment of bilayer DDR hydrogels composed of a hierarchical structure, with the micropatterns exhibiting reversible “shape-memorizing” behavior driven by zinc ions. This strategy offers a facile approach to fabricating a promising mechanically strong soft-wet actuator and rewritable hydrogel surface.

Graphical abstract: Zinc ion-triggered two-way macro-/microscopic shape changing and memory effects in high strength hydrogels with pre-programmed unilateral patterned surfaces

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Supplementary files

Article information


Submitted
13 Dec 2011
Accepted
25 Apr 2012
First published
31 May 2012

Soft Matter, 2012,8, 6846-6852
Article type
Paper

Zinc ion-triggered two-way macro-/microscopic shape changing and memory effects in high strength hydrogels with pre-programmed unilateral patterned surfaces

T. Bai, Y. Han, P. Zhang, W. Wang and W. Liu, Soft Matter, 2012, 8, 6846
DOI: 10.1039/C2SM07364A

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