Volume 38, Number 5, May II 1997
|Page(s)||395 - 400|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Vesicles decorated with magnetic particles
LPM2C, Université Joseph Fourier,
Maison des Magistères Jean Perrin 25 avenue des Martyrs,
CNRS B.P. 166, 38042 Grenoble Cédex 09, France
2 Institut Laue Langevin - Avenue des Martyrs, B.P. 156 X, 38042 Grenoble, France
Accepted: 5 April 1997
We develop a model to describe phospholipid vesicles decorated with small ferromagnetic grains on their membranes. Competition between magnetic energy and curvature energy determines their equilibrium shape in the presence of a magnetic field. Our analysis shows that a rotating field of a few mTesla can induce a shape transition from prolate ellipsoids to non-axisymmetric shapes, followed by a second-order bifurcation to oblate ellipsoids. A static field applied to vesicles adhering to a substrate induces an unbinding transition. In both cases, thermal fluctuations of the vesicle shapes are strongly reduced in the presence of the magnetic field.
PACS: 87.22.Bt – Membrane and subcellular physics and structure / 75.50.Mm – Magnetic liquids / 68.10.Cr – Surface energy (surface tension, interface tension, angle of contact, etc.)
© EDP Sciences, 1997
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