%0 Book Section %1 statphys23_0550 %A Dupuis, V. %A Wandersman, E. %A Dubois, E. %A Perzynski, R. %A Robert, A. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K aging colloids dynamics glass out-of-equilibrium statphys23 topic-9 transition %T Slow dynamics and aging in glassy ferrofluids %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=550 %X Ferrofluids are examples of complex fluids composed of magnetic nanoparticles dispersed in a host liquid. The colloidal stability of such systems can be reached by introducing repulsive interactions between the particles (by adsorption of surfactants or charged ligands on their surface) to compensate the Van der Waals and magnetic dipolar attractive interactions. The balance between these attractions and repulsions (all of order kT), which can be experimentally tuned by adjusting the value of several control parameters (the ionic strength, the osmotic pressure or the pH), allows one to drive the system in a variety of states such as fluid, liquid, gas and glassy solid. In this communication, I will report several recent experimental results which shed light on the glass transition of maghemite ferrofluids both from the structural point of view (Small Angle Neutron Scattering experiments) and from the dynamical point of view (Magneto-induced birefringence relaxation and X ray Photon Correlation Spectroscopy experiments). I will show in particular that these last two techniques are complementary and probe respectively the slow rotational and translational dynamics of the magnetic nanoparticles close to their glass transition.

@incollection{statphys23_0550, abstract = {Ferrofluids are examples of complex fluids composed of magnetic nanoparticles dispersed in a host liquid. The colloidal stability of such systems can be reached by introducing repulsive interactions between the particles (by adsorption of surfactants or charged ligands on their surface) to compensate the Van der Waals and magnetic dipolar attractive interactions. The balance between these attractions and repulsions (all of order kT), which can be experimentally tuned by adjusting the value of several control parameters (the ionic strength, the osmotic pressure or the pH), allows one to drive the system in a variety of states such as fluid, liquid, gas and glassy solid. In this communication, I will report several recent experimental results which shed light on the glass transition of maghemite ferrofluids both from the structural point of view (Small Angle Neutron Scattering experiments) and from the dynamical point of view (Magneto-induced birefringence relaxation and X ray Photon Correlation Spectroscopy experiments). I will show in particular that these last two techniques are complementary and probe respectively the slow rotational and translational dynamics of the magnetic nanoparticles close to their glass transition.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Dupuis, V. and Wandersman, E. and Dubois, E. and Perzynski, R. and Robert, A.}, biburl = {https://www.bibsonomy.org/bibtex/202a7afd2732ea8263c6bd486f1d99189/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {9d565a222911ba63076cc7ba86ef25c5}, intrahash = {02a7afd2732ea8263c6bd486f1d99189}, keywords = {aging colloids dynamics glass out-of-equilibrium statphys23 topic-9 transition}, month = {9-13 July}, timestamp = {2007-06-20T10:16:23.000+0200}, title = {Slow dynamics and aging in glassy ferrofluids}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=550}, year = 2007 }