Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-09-24
Physics
Condensed Matter
Soft Condensed Matter
12 pages - 452kB 7 - figures - 1 Table will be published in Journal of Physics : Condensed Matter
Scientific paper
10.1088/0953-8984/20/49/494216
The attractive interactions between oppositely charged species (colloids, macromolecules etc) dispersed in water are strong, and the direct mixing of solutions containing such species generally yields to a precipitation, or to a phase separation. We have recently developed means to control the electrostatically-driven attractions between nanoparticles and polymers in water, and at the same time to preserve the stability of the dispersions. We give here an account of the formation of supracolloidal aggregates obtained by co-assembly of 7 nm particles with copolymers. Nanostructured rods of length comprised between 5 and 50 microns and diameter 500 nm were investigated. By application of a magnetic field, the rods were found to reorient along with the magnetic field lines. The kinetics of reorientation was investigated using step changes of the magnetic field of amplitude 90 degrees. From the various results obtained, among which an exponential decay of the tangent of the angle made between the rod and the field, we concluded that the rods are superparamagnetic.
Berret Jean-Francois
Fresnais Jerome
Frka-Petesic B.
Perzynski Régine
Sandre Olivier
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