Topography-guided buckling of swollen polymer bilayer films into three-dimensional structures. Issue 5 (12th January 2017)

• Record Type: Journal Article
• Authors: Jeong, Joonwoo; Cho, Yigil; Lee, Su Yeon; Gong, Xingting; Kamien, Randall D.; Yang, Shu; Yodh, A. G.
• Is Part Of: Soft matter. Volume 13:Issue 5(2017)
• Page Start: 956
• Page End: 962
• Publication Date: 2017-01-12
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c6sm02299e
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We employ surface topography as a new means to guide swelling-induced buckling of polymer bilayer films. Abstract : 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.