Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 13, Pages 11363-11367Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02007
Keywords
tough hydrogel; 3D printing; biomimetic structure; folded domain; hidden length; titin
Funding
- National Natural Science Foundation of China [51403184, 11672268, 11402056, 11621062]
- Zhejiang Provincial Natural Science Foundation of China [LR16A020001]
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Titin is composed of repeated modular domains which unfold and dissipate energy upon loading. Here we employed such molecular-level paradigm to fabricate macroscopic ultratough hydrogel structures with titin-like domains, enabled by three-dimensional printing with multiple nozzles. Under stretch, the relatively thin and weak gel fibers in the printed structures break first and the hidden lengths postpone the failure of the main structures, mimicking the toughening principle in titin. These titin-like folded domains have been incorporated into a synthetic spider-web, which shows significantly enhanced extensibility and toughness. This work provides a new avenue of topological design for materials/structures with desired properties.
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