doi:10.1016/j.polymer.2009.01.034engMillan, A.Urtizberea, A.Natividad, E.Luis, F.Silva, N. J. O.Palacio, F.Mayoral, I.Ruiz-Gonzalez, M. L.Gonzalez-Calbet, J. M.Lecante, P.Serin, V.Akaganeite polymer nanocompositesART-2009-65621An “in situ” method for the production of akaganeite polymer nanocomposites is described. A controlled precipitation is achieved by using a polymer matrix, polyvinylpyridine, containing N-base functional groups that form coordination bonds with iron ions. The resulting materials have permitted the observation of two sources of magnetic moment in akaganeite nanoparticles: (1) finite size effects with a characteristic blocking temperature below 2 K; and (2) a deficient Cl− occupancy, with a characteristic blocking temperature around 18 K. Moreover, the nanocomposites can be dissolved in slightly acidic media to obtain stable aqueous nanoparticle dispersions that could be useful in biomedical applications.2009http://zaguan.unizar.es/record/13219910.1016/j.polymer.2009.01.034http://zaguan.unizar.es/record/132199oai:zaguan.unizar.es:132199info:eu-repo/grantAgreement/ES/MICINN/CSD2007-00010info:eu-repo/grantAgreement/ES/MICINN/MAT2007-61621Polymer 50, 5 (2009), 1088-1094by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess