FMR Study of the Porous Silicate Glasses with Fe3O4Magnetic Nanoparticles Fillers

B Zapotoczny,M R Dudek,N Guskos,J J Kozioł,E Rysiakiewicz-Pasek,M Kośmider,B V Padlyak

doi:10.1155/2012/341073

Abstract

The results of research on new magnetic materials for biomedical applications are discussed. These materials are porous silicate glasses with magnetic fillers. To ensure the smallest number of components for subsequent removal from the body, the magnetic fillers are bare magnetite nanoparticles (Fe3O4). The magnetic properties of these materials have been investigated using the ferromagnetic resonance method (FMR). The FMR analysis has been complemented by scanning electron microscope (SEM) measurements. In order to examine the effect of time degradation on filling the porous glass with bare magnetite nanoparticles the FMR measurement was repeated five months later. For the samples with high degree of pore filling, in contrast to the samples with low degree of pore filling, the FMR signal was still strong. The influence of different pH values of magnetite nanoparticles aqueous suspension on the degree of filling the pores of glasses is also discussed. The experimental results are supported by computer simulations of FMR experiment for a cluster ofNmagnetic nanoparticles locked in a porous medium based on a stochastic version of the Landau-Lifshitz equation for nanoparticle magnetization.

Highlights

The ferrimagnetic magnetite (Fe3O4) nanoparticles are considered among the promising materials for biotechnological and medical applications because of their biocompatibility and low toxicity [1, 2]
We show that bare magnetite nanoparticles can be fillers of a porous silicate glass without the need for additional protective layer of nanoparticles
The nonmagnetic porous surrounding of the magnetic nanoparticles acts as a protective layer and magnetic properties of such materials may remain unchanged for a long time

Summary

Introduction

The ferrimagnetic magnetite (Fe3O4) nanoparticles are considered among the promising materials for biotechnological and medical applications because of their biocompatibility and low toxicity [1, 2]. In some medical applications such as magnetic nanocapsules for drug delivery, it is more desirable to use materials with the smallest number of components for subsequent removal from the body. Taking this into account, the study of magnetic properties of bare magnetic nanoparticles for different nonmagnetic matrices is an important goal of research. We show that bare magnetite nanoparticles can be fillers of a porous silicate glass without the need for additional protective layer of nanoparticles In this case, the nonmagnetic porous surrounding of the magnetic nanoparticles acts as a protective layer and magnetic properties of such materials may remain unchanged for a long time. The silica-based materials are currently implemented in medical and biotechnological applications such as bone-repairing devices and drug delivery systems [8, 9]

Experimental

Discussion of Results

Conclusions