期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 10, 页码 9077-9084出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01610
关键词
tough hydrogels; stretch; transfer printing; shape-morphing; origami
资金
- National Natural Science Foundation of China [21674064]
- Shenzhen Science and Technology Foundation [JCYJ20160520173802186]
- Natural Science Foundation of SZU [827-000040]
- Research Grants Council of Hong Kong [GRF14302315]
Stimuli-responsive hydrogels that undergo programmable shape deformation are of great importance for a wide variety of applications spanning from soft robotics and biomedical devices to tissue engineering and drug delivery. To guide shape morphing, anisotropic elements need to be encoded into the hydrogels during fabrication, which are extremely difficult to alter afterward. This study reports a simple and reliable mechanochemical regulation strategy to postengineer the hydrogels by encoding structures of high stiffness locally into prestretched tough hydrogels through ion transfer printing with a paper-cut. During printing, trivalent ions (Fe3+) were patterned and diffused into the prestretched tough gels, which dramatically increased the local stiffness by forming the second trivalent ionically cross-linked network. By removing the applied stretching force, the stiff anisotropy encoded prestretched tough hydrogels underwent programmable shape morphing into complex three-dimensional origami structures due to the stiffness mismatch.
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