Université de Fribourg

Amino covalent binding approach on iron oxide nanoparticle surface: toward biological applications

Griffete, Nébéwia ; Clift, Martin J.D. ; Lamouri, Aazdine ; Digigow, Reinaldo G. ; Mihut, Adriana M. ; Fink, Alke ; Rothen-Rutishauser, Barbara ; Dietsch, Hervé

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2012, p. -

We report on the synthesis and the surface modification of different types of magnetic iron oxide particles by developing an original process based on diazonium salts chemistry. Particles were first coated with amino groups and then subjected to polyethylene glycol (PEG) surface modification. They were subsequently characterized by Transmission electron microscopy, infrared spectroscopy,...

Université de Fribourg

Thermoresponsive hybrid microgel particles with intrinsic optical and magnetic anisotropy

Dagallier, Camille ; Dietsch, Hervé ; Schurtenberger, Peter ; Scheffold, Frank

In: Soft Matter, 2010, vol. 6, p. 2174-2177

We describe the synthesis of thermoresponsive, magnetic, optically anisotropic and orientable colloidal particles based on poly(N-isopropylacrylamide) hybrid microgels (PNIPAMs) with an embedded ellipsoidal hematite (α-Fe₂O₃) core. Our ability to orient the particles with a magnetic field is demonstrated by small angle X-ray scattering and by optical polarization microscopy.