Capillary origami: spontaneous wrapping of a droplet with an elastic sheet
C. Py, P. Reverdy, L. Doppler, J. Bico, B. Roman, C. N. Baroud
Abstract
The interaction between elasticity and capillarity is used to produce three dimensional structures, through the wrapping of a liquid droplet by a planar sheet. The final encapsulated 3D shape is controlled by tayloring the initial geometry of the flat membrane. A 2D model shows the evolution of open sheets to closed structures and predicts a critical length scale below which encapsulation cannot occur, which is verified experimentally. This elastocapillary length is found to depend on the thickness as h3/2, a scaling favorable to miniaturization which suggests a new way of mass production of 3D micro- or nano-scale objects.
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