Synthesis of Nearly Monodisperse Iron Oxide and Oxyhydroxide Nanocrystals

Abstract

Uniform magnetite, hematite, and goethite nanocrystals were prepared through an attractive method based on an oleic acid/alcohol/water system. By adjusting the synthetic parameters (base concentration, alcohol content, categories of alcohols, etc.), the controlled synthesis of uniform magnetite, hematite, and goethite nanocrystals can be easily achieved. Detailed investigations on the effect of the experimental parameters on the morphology of the final products and the phase transitions among the magnetite, hematite, and goethite phases were carried out. Finally, a method of doping other metal ions into magnetite was developed and the magnetic properties of magnetite doped with different metal elements were studied.

Gadolinium‐Doped Iron Oxide Nanoprobe as Multifunctional Bioimaging Agent and Drug Delivery System

“…[22][23][24][25] However, doped particles which possess these physical and chemical characteristics have not been found to be signifi cantly different from the parent, undoped ION. [ 26 ] Thus, alternative doping ratios and atoms need to be further investigated to acquire high effi cient T 1 -T 2 dual-modal contrast agents for MRI.…”

Magnetic properties study of iron-oxide nanoparticles/PVA ferrogels with potential biomedical applications

“…After cooling to room temperature, NH 3 was added to the clear solution to trigger the co-precipitation of iron-oxide NPs. The final pH value of this mixed solution was 10 (Jolivet et al 2004;Kim et al 2003;Liang et al 2006). Thin samples of the ferrogels were obtained by cross-linking on at molds using aliquots of the initial solution.…”

Alkaline Metal Reagent-Assisted Synthesis of Monodisperse Iron Oxide Nanostructures

“…Their unique magnetic properties allow for ferrofluids, data recording, and medical applications in drug delivery, magnetic resonance imaging (MRI) and hyperthermal cancer treatment [5][6][7]. Among advanced approaches for magnetic nanocrystal synthesis including co-precipitation reactions [8,9], sol-gel [10], hydrothermal/solvothermal [11], and microemulsion or microwave-assisted methods [12], the formation of monodisperse Fe 3 O 4 nanoparticles has been demonstrated with two typical wet chemical synthetic approaches: (I) solvothermal decomposition of iron (III) oleate complexes; and (2) reductively enhanced reaction using iron (III) acetylacetonate reagents with oleylamine under the reflux condition of high-temperature organic solvents [13][14][15]. While abundant chemical synthetic routes have been reported to obtain uniform magnetic nanostructures with size, shape and chemical composition control, however, the tailoring of enhanced pure phase over various iron oxide polymorphology remains a synthetic challenge without the constraint of size due to unstable nanoscale surface and interface which involved phase transformation resulting in unwanted core-shell nanostructures [13,16,17].…”