We have fabricated micro-scrolls (tubes/springs) by rolling up pre-strained metal/PVA–PAA bilayers, where the strain is caused by the swelling of the PVA–PAA hydrogel in aqueous media. Stimuli-responsive behavior of the micro-tubes/springs is demonstrated by rolling and unrolling caused by the volume change of the PVA–PAA hydrogel in response to environmental fluids.
W. Li, G. Huang, H. Yan, J. Wang, Y. Yu, X. Hu, X. Wu and Y. Mei, Soft Matter, 2012, 8, 7103 DOI: 10.1039/C2SM25366F
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