Manipulation of the Magnetic Properties of Magnetite−Silica Nanocomposite Materials by Controlled Stober Synthesis
- 30 June 2005
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 21 (16), 7524-7527
- https://doi.org/10.1021/la0508893
Abstract
The paper describes the synthesis and characterization of the magnetic properties of magnetite/silica nanocomposites using a modified Stober method. Magnetite nanoparticles averaging 8-10 nm in diameter and stabilized with oleic acid in toluene were used as the magnetic component of the nanocomposites. SQUID magnetic measurements and ferromagnetic resonance spectroscopy measurements were performed at each stage of the synthesis to understand the properties of the formed composites. Changes of blocking temperature in ZFC/FC SQUID curves correlated with corresponding changes of the resonance field in the ferromagnetic spectra of the sample at each stage of formation. The paper concludes that it is possible to manipulate the magnetic properties of silica/magnetite composite materials by controlling their surface properties and silica coating thickness.Keywords
This publication has 14 references indexed in Scilit:
- Magnetic nanoparticle design for medical diagnosis and therapyJournal of Materials Chemistry, 2004
- BSA Immobilization on Amine-Functionalized Superparamagnetic Iron Oxide NanoparticlesChemistry of Materials, 2004
- Superparamagnetic Fe2O3 Beads−CdSe/ZnS Quantum Dots Core−Shell Nanocomposite Particles for Cell SeparationNano Letters, 2004
- Platinum-Maghemite Core−Shell Nanoparticles Using a Sequential SynthesisNano Letters, 2003
- Synthesis and Magnetic Characterization of Zinc Ferrite Nanoparticles with Different Environments: Powder, Colloidal Solution, and Zinc Ferrite−Silica Core−Shell NanoparticlesLangmuir, 2002
- Dipolar interactions in two- and three-dimensional magnetic nanoparticle arraysPhysical Review B, 2002
- Modifying the Surface Properties of Superparamagnetic Iron Oxide Nanoparticles through A Sol−Gel ApproachNano Letters, 2002
- Control of Packing Order of Self-Assembled Monolayers of Magnetite Nanoparticles with and without SiO2 Coating by Microwave IrradiationLangmuir, 1998
- Superparamagnetic relaxation of weakly interacting particlesPhysical Review Letters, 1994
- A dynamic study of small interacting particles: superparamagnetic model and spin-glass lawsJournal of Physics C: Solid State Physics, 1988