A Facile Synthetic Route for the Preparation of Superparamagnetic Iron Oxide Nanorods and Nanorices with Tunable Surface Functionality

Abstract

A simple procedure is used to prepare anisometric iron oxide nanoparticlesexhibiting superparamagnetic behavior. The figure shows the nanorod/nanorice morphology of these novel structures. Superparamagnetism is engineered in these structures by favoring thermally activated processes by adopting small particle sizes, introducing defects, and doping with cations. Positively and negatively charged particles are obtained by varying the surface coating.

Iron oxide porous nanorods with different textural properties and surface composition: Preparation, characterization and electrochemical lithium storage capabilities

“…A look to the well-known Fe/O 2 /H 2 O system let us to anticipate that goethite could be the ideal solid precursor to easily obtain ␣-Fe 2 O 3 nanorods with different textural characteristics. Methods based on a modified carbonate route (see Section 2 for details) have been used for the large scale production of monodisperse goethite nanorods [21,[23][24][25][26]. In fact, goethite is one of the main components in the lateritic soils found in the tropical and subtropical regions of Cuba, Brazil, The Philippines, Indonesia and southern China [27,28].…”

Superparamagnetic Composites: Magnetism with No Memory

“…We have recently proposed the use of zirconia matrixes because of their high stability at different pHs and high reactivity with phosphate compounds. [110] Zirconia easily reacts with phosphate compounds, [111] and in fact is used as a highly selective adsorbent for compounds containing phosphonic acid. [112] Titania matrixes could also be considered a good replacement to silica, especially because they can impart photocatalytic properties to the SPCs.…”

Shape matters: synthesis and biomedical applications of high aspect ratio magnetic nanomaterials

“…Tartaj and co-workers reported a similar approach for controlling the morphology in the first step of the synthetic process. 26 Their simple procedure for the synthesis of nanorods and nanorices with tuneable surface chemistry consisted in preparing rod-and rice-like goethite nanoparticles by aerobic oxidation of FeSO 4 and coating them with an inorganic alumina or zirconia layer. Finally, to promote the formation of superparamagnetic iron oxide spinels, the nanorods were heated under a H 2 atmosphere.…”