Development of magnetic chromatography to sort polydisperse nanoparticles in ferrofluids.
Whatever the strategy of synthesis, nanoparticles in magnetic fluids commonly feature a broad size distribution. However, the presence of several size populations in ferrofluids is often problematic because of the close relationship between the efficiency of the nanoparticles and their physicochemical properties. In this work, a magnetic size sorting procedure is developed in order to reduce this polydispersity, using the magnetic properties of the iron oxide nanoparticles. This magnetic sorting with an adjustable magnetic field allows isolation of the small superparamagnetic particles as well as the larger particles. Magnetometry, nuclear magnetic relaxation dispersion profiles and transmission electron microscopy were successfully used to check the efficiency of the magnetic sorting procedure, which was shown to work as a 'magnetic' chromatography.
Forge
Delphine
D
Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, 24 Avenue du Champ de Mars, B-7000 Mons, Belgium.
Gossuin
Yves
Y
Roch
Alain
A
Laurent
Sophie
S
Elst
Luce Vander
LV
Muller
Robert N
RN
D005591:Chemical Fractionation; D002845:Chromatography / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics / Q000379:methods*; D053758:Nanoparticles / Q000032:analysis* / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D013535:Suspensions
D005290:Ferric Compounds; D013535:Suspensions; C000499:ferric oxide