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Ferrimagnetic Membranes for Separation of Paramagnetic and Diamagnetic Species

  • Jihye Gwak (a1), André Ayral (a1), Vincent Rouessac (a1), Louis Cot (a1), Jean-Claude Grenier (a2), Eue-Soon Jang (a3) and Jin-Ho Choy (a3)...


For using as separative membranes based on magnetic selectivity, nanoporous ferrimagnetic membranes of maghemite (γ-Fe2O3) and cobalt ferrite (Fe2CoO4) were prepared by the sol-gel route from ferrofluid colloidal solutions. Their magnetic properties were examined by superconductor quantum interference device (SQUID), and their structures and porous textures were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption-desorption analyses. O2-N2 adsorption and air separation experiments were carried out in order to evidence magnetic interactions in static and dynamic conditions, respectively. A small effect of an external magnetic field on the selectivity of these membranes was observed.



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