title: Interacting Superparamagnetic Iron(II) Oxide Nanoparticles: Synthesis and Characterization in Ionic Liquids.
abstract: Interacting superparamagnetic iron(II) oxide nanoparticles (NPs) with sizes of 5.3 ± 1.6 nm were prepared by simple decomposition of [Fe(COT)2] (COT = 1,3,5,7-cyclooctatetraene) with 5 bar of H2 in 1-n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMI·NTf2) ionic liquid (IL). The static and dynamic magnetic characterization revealed a superparamagnetic behavior with weak dipolar interactions of these NPs. In situ structural studies by X-ray absorption spectroscopy demonstrated that they consist of nanostructured FeO. This approach is an appropriate method to prepare and stabilize nanostructured FeO particles, where the presence of an IL proved to be fundamental to suppress the aggregation and usual overoxidation of the FeO NPs.
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: Bárbara C
authors.initials: BC
authors.lastname: Leal
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: Jackson D
authors.initials: JD
authors.lastname: Scholten
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: Maria C M
authors.initials: MC
authors.lastname: Alves
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: Jonder
authors.initials: J
authors.lastname: Morais
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: I
authors.initials: I
authors.lastname: de Pedro
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: L
authors.initials: L
authors.lastname: Fernandez Barquin
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) , Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil.
authors.forename: Jairton
authors.initials: J
authors.lastname: Dupont