Author/Authors :
Millan، نويسنده , , A. and Urtizberea، نويسنده , , A. and Natividad، نويسنده , , E. and Luis، نويسنده , , F. and Silva، نويسنده , , N.J.O. and Palacio، نويسنده , , F. and Mayoral، نويسنده , , I. and Ruiz-Gonzلlez، نويسنده , , M.L. and Gonzلlez-Calbet، نويسنده , , J.M. and Lecante، نويسنده , , P. and Serin، نويسنده , , V.، نويسنده ,
Abstract :
An “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.
