Abstract
Soft Robots Many plant seeds, including pine cones, open or close in response to changes in humidity. Inspired by these hygroexpansive seeds, Shin et al. fabricated a “hygrobot.” The hygrobot was composed of a film that was responsive to environmental humidity attached to a film that was not. Aligned nanofibers in the responsive layer swelled when humidity increased, causing the bilayer structure to bend. Decreasing humidity shrunk the moisture-responsive layer, straightening out the robot. Legs with asymmetric friction coefficients converted the bending into directional motion on a moist surface. Sci. Robot. 3 , eaar2629 (2018).
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