NDLI: Thermally responsive rolling of thin gel strips with discrete variations in swelling

Content Provider	Royal Society of Chemistry (RSC)
Author	Hanna, James A. Kim, Jungwook Santangelo, Christian D. Hayward, Ryan C.
Copyright Year	2012
Abstract	The process by which spatial variations in growth transform two-dimensional elastic membranes into three-dimensional shapes is both a fundamentally interesting mechanism of shape selection and a powerful tool for the preparation of responsive materials. From the perspective of lithographic patterning of thin gel sheets, it is most straightforward to prepare materials consisting of discrete regions with different degrees of swelling. However, the sharp variations in swelling at the boundaries between such regions make it impossible for the sheet to adopt a configuration that is free of in-plane stresses everywhere. Thus, the deformation of such materials is not well understood. Here, we consider the geometrically simple case of a photo-crosslinkable poly(N-isopropylacrylamide) copolymer patterned into thin rectangular strips divided into one high- and one low-swelling region. When swelled in an aqueous medium at 22 °C, the sheet rolls into a three-dimensional shape consisting of two nearly cylindrical regions connected by a transitional neck. Heating to 50 °C leads to fully reversible de-swelling back to a flat configuration. We propose a scaling argument based on a balance between stretching and bending energies that relates the curvature of the 3D shape to the width and thickness of the strip, find good agreement with experimental data and numerical simulations, and further demonstrate how this simple geometry provides a powerful route for the fabrication of self-folding stimuli-responsive micro-devices.
Starting Page	2375
Ending Page	2381
Page Count	7
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	8
Journal	Soft Matter
DOI	10.1039/c2sm06681e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Geometry Poly(N-isopropylacrylamide) Copolymer Curvature Three-dimensional space
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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