New Nanoparticle Structure Boosts Magnetic Properties

December 19, 2005

Magnetic nanoparticles have shown promise as contrast-enhancing agents for improving cancer detection using magnetic resonance imaging (MRI), as miniaturized heaters capable of killing malignant cells, and as targeted drug delivery vehicles. Now, researchers at the University of Idaho have developed a new type of nanoparticle that produces a magnetic field up to 10 times stronger than typical iron oxide nanoparticles. Clearer MRI images of small tumors and more accurate tumor targeting could be the result.

A research team led by You Qiang, Ph.D., reports in the Journal of Nanoparticle Research that it has developed a method for creating iron nanostructured clusters that can then be coated with a thin layer of iron oxide. The investigators also discuss how their method can create these so-called “core-shell” nanoparticles of exact size ranging from 2 nanometers to 100 nanometers in diameter.

Characterization of these core-shell nanostructures show that their magnetic moment, a measure of their strength as a magnet, depends on the size of the final particle – particles with a diameter of 3 nanometers have a magnetic moment of 80 emu (the unit of magnetic moment) per gram, while those with a diameter of 100 nanometer have a magnetic moment of 205 emu per gram, close to the maximum value for pure iron. In contrast, typical iron oxide nanoparticles have a magnetic moment of 20 to 30 emu per gram.

This work is detailed in a paper titled, “Iron/iron oxide core-shell nanoclusters for biomedical applications.” This paper was published online in advance of print publication.

Soruce: National Cancer Institute

Explore further: Biologist disputes conclusions of recent papers on biological magnetism

Related Stories

Magnetic recording with light and no heat on garnet

January 19, 2017

A strong, short light pulse can record data on a magnetic layer of yttrium iron garnet doped with Co-ions. This was discovered by researchers from Radboud University in the Netherlands and Bialystok University in Poland. ...

First experimental proof of a 70 year old physics theory

January 3, 2017

PARK Je-Geun, Associate Director at the Center for Correlated Electron Systems and collaborators have demonstrated the magnetic behavior of a special class of 2-D materials. This is the first experimental proof to a theory ...

Controlling the magnetic properties of individual iron atoms

January 29, 2016

The Fe2+ atom embedded in a semiconductor exhibits a single non-degenerate ground state of zero magnetic moment. A team of scientists from the University of Warsaw has just shown that by using a sufficiently large strain, ...

Recommended for you

Canada conservationist warns of 'cyber poaching'

February 25, 2017

Photographers, poachers and eco-tour operators are in the crosshairs of a Canadian conservationist who warns that tracking tags are being hacked and misused to harass and hunt endangered animals.

Polymer additive could revolutionize plastics recycling

February 24, 2017

When Geoffrey Coates, the Tisch University Professor of Chemistry and Chemical Biology, gives a talk about plastics and recycling, he usually opens with this question: What percentage of the 78 million tons of plastic used ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.