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Instant fabrication and selection of folded structures using drop impact

Summary: Instant fabrication and selection of folded
structures using drop impact
Arnaud Antkowiak
, Basile Audoly
, Christophe Josserand
, S´ebastien Neukirch
and Marco Rivetti

CNRS & UPMC Univ Paris 06, UMR 7190: Institut Jean Le Rond d'Alembert, 4 place Jussieu, F-75005 Paris, France
Submitted to Proceedings of the National Academy of Sciences of the United States of America
A drop impacting a target cut out in a thin polymer film is wrapped
by the film in a dynamic sequence involving both capillary forces and
inertia. Different 3D structures can be produced from a given target
by slightly varying the impact parameters. A simplified model for a
nonlinear dynamic Elastica coupled with a drop successfully explains
this shape selection, and yields detailed quantitative agreement with
experiments. This first venture into the largely unexplored dynam-
ics of elasto-capillary assemblies opens up the perspective of mass
production of 3D packages with individual shape selection.
Capillary forces exerted by a water drop are sufficient to


Source: Audoly, Basile - Institut Jean Le Rond D'Alembert, Université Pierre-et-Marie-Curie, Paris 6


Collections: Materials Science; Physics