期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201905273
关键词
curvature; hydrogels; photolithography; shape morphing; temperature responsiveness
类别
资金
- U.S. Army Research Office [W911NF-16-1-0119]
- National Science Foundation [DMR-1507377]
- Massachusetts Life Sciences Center
A photocrosslinkable poly(N, N '-diethylacrylamide) copolymer allows for the photolithographic fabrication of hydrogel sheets with nonuniform crosslinking density and swelling ratio. Using this material system, different 3D shapes with nonzero Gaussian curvature K are successfully programmed by prescribing a metric defined by in-plane variations in swelling. However, this methodology does not control the direction of buckling adopted by each positive K feature, and therefore cannot controllably select between different isometric shapes defined by a single metric. Here, by introducing gradients in swelling through the thickness of the gel sheet by tuning the absorption of the UV-light used for crosslinking, a preferential buckling direction is locally specified for each feature by the direction of UV exposure. By also controlling the strength of coupling between neighboring features, this is shown to be an effective method to program buckling direction of each unit within a canonical corrugated surface shape.
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