Topography-guided buckling of swollen polymer bilayer films into three-dimensional structures
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- Topography-guided buckling of swollen polymer bilayer films into three-dimensional structures
- Jeong, Joonwoo; Cho, Yigil; Lee, Su Yeon; Gong, Xiting; Kamien, Randall D.; Yang, Shu; Yodh, Arjun G.
- Issue Date
- ROYAL SOC CHEMISTRY
- SOFT MATTER, v.13, no.5, pp.956 - 962
- Thin films that exhibit spatially heterogeneous swelling often buckle into the third dimension to minimize stress. These effects, in turn, offer a promising strategy to fabricate complex three-dimensional structures from two-dimensional sheets. Here we employ surface topography as a new means to guide buckling of swollen polymer bilayer films and thereby control the morphology of resulting three-dimensional objects. Topographic patterns are created on poly(dimethylsiloxane) (PDMS) films selectively coated with a thin layer of non-swelling parylene on different sides of the patterned films. After swelling in an organic solvent, various structures are formed, including half-pipes, helical tubules, and ribbons. We demonstrate these effects and introduce a simple geometric model that qualitatively captures the relationship between surface topography and the resulting swollen film morphologies. The model's limitations are also examined.
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