Magnetic tubules

Damien Letellier (1) , Olivier Sandre (2) , Christine Ménager (1) , Valérie Cabuil (1) , Michel Lavergne (3)

1 LI2C - Liquides Ioniques et Interfaces Chargées
2 Laboratoire des Matériaux Désordonnés et Hérérogènes
3 UPMC - Université Pierre et Marie Curie - Paris 6

Dispersion of tubules made of diacetylenic phospholipids (DC 8,9 PC), in aqueous colloidal dispersions of magnetic nanoparticles is studied as a function of the sign of particles surface charges. In every case the tubule-vesicle transition temperature is decreased by the presence of the magnetic nanoparticles. Electrophoresis experiments on the tubules in pure water permits to conclude on a negative apparent surface charge. We study the magnetic response of the system to a static or stationary rotating field and to a magnetic field gradient. These experiments reveal an excess or a lack of magnetic permeability between tubules and the surrounding medium. Electron microscopy confirms these results showing an electrostatic interaction between the phospholipidic bilayer and the magnetic particles.

Mots clés: Magnetic fluids; Self-assemblies; Tubules; Phospholipids; Electrostatic interaction

Domaines: Matière Molle [cond-mat.soft]; Matériaux; Polymères

Damien Letellier, Olivier Sandre, Christine Ménager, Valérie Cabuil, Michel Lavergne. Magnetic tubules. Materials Science and Engineering: C, 1997, 5 (2), pp.153-162. ⟨10.1016/S0928-4931(97)00035-0⟩. ⟨hal-02311201⟩