New Nanoparticle Structure Boosts Magnetic Properties

Dec 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: NIST offers electronics industry two ways to snoop on self-organizing molecules

add to favorites email to friend print save as pdf

Related Stories

US company sells out of Ebola toys

4 hours ago

They might look tasteless, but satisfied customers dub them cute and adorable. Ebola-themed toys have proved such a hit that one US-based company has sold out.

UN biodiversity meet commits to double funding

4 hours ago

A UN conference on preserving the earth's dwindling resources wrapped up Friday with governments making a firm commitment to double biodiversity aid to developing countries by 2015.

Partial solar eclipse over the U.S. on Thursday, Oct. 23

5 hours ago

People in most of the continental United States will be in the shadow of the Moon on Thursday afternoon, Oct. 23, as a partial solar eclipse sweeps across the Earth. For people looking through sun-safe filters, from Los Angeles, ...

Recommended for you

Nanoparticle technology triples the production of biogas

10 hours ago

Researchers of the Catalan Institute of Nanoscience and Nanotechnology (ICN2), a Severo Ochoa Centre of Excellence, and the Universitat Autònoma de Barcelona (UAB) have developed the new BiogàsPlus, a technology which allows ...

Quantum effects in nanometer-scale metallic structures

12 hours ago

Plasmonic devices combine the 'super speed' of optics with the 'super small' of microelectronics. These devices exhibit quantum effects and show promise as possible ultrafast circuit elements, but current ...

Research unlocks potential of super-compound

13 hours ago

Researchers at The University of Western Australia's have discovered that nano-sized fragments of graphene - sheets of pure carbon - can speed up the rate of chemical reactions.

User comments : 0