Instability of the origami of a ferrofluid drop in a magnetic
field
T. Jamin, C. Py & E. Falcon
Univ Paris Diderot, Sorbonne Cité, MSC,
CNRS, UMR 7057, F-75 013 Paris, France, EU
Reference:
Physical Review Letters
107, 204503 (2011)
DOI: 10.1103/PhysRevLett.107.204503
Abstract:
Capillary
origami is the wrapping of an usual fluid drop by a planar
elastic membrane due to the interplay between capillary and
elastic forces. Here, we use a drop of magnetic fluid whose
shape is known to strongly depend on an applied magnetic field.
We study the quasi-static and dynamical behaviors of such a
magnetic capillary origami. We report the observation of an
overturning instability that the origami undergoes at a critical
magnetic field. This instability is triggered by an interplay
between magnetic and gravitational energies in agreement with
the theory presented here. Additional effects of elasticity and
capillarity on this instability are also discussed.
PACS : 47.65.Cb
-
Magnetic
fluids and ferrofluids
46.32.+x - Static buckling and instability
68.08.-p - Liquid-solid interfaces
PDF file
See also
press items from
- "Magnetic
field flips miniature origami" in Physics 4, 93 (2011) by David Lindley ;
-
,
the french newspaper: "Plier des origamis
sans les doigts" Le Monde, 19 novembre 2011,
"Cahier Sciences" p. 3 by
David Larousserie
- "Origami
folds with light or a magnetic field" in Inovacao
tecnologica (in Portuguese -
see here for an english
"google" translation)
More on
ferrofluids