Structural, magnetic and morphological characterization of nanoparticles of iron oxide coated with dextran - AMI 25 used as contrastting agent for magnetic resonance imaging (MRI) - Gamarra, Lionel Fernel; Brito, Giancarlo Espósito de Souza; Amaro Junior, E; Goya, Gerardo Fabían; Pontuschka, Walter Maigon (Encontro da Sociedade Brasileira de Pesquisa em Materiais - SBPMat,, 2005)