Date of Award

5-2016

Degree Type

Thesis

Degree Name

Master of Science

Major

Biomedical Engineering

Major Professor

Jacqueline A. Johnson

Committee Members

Silke Hecht, Claudia Rawn

Abstract

Fe3O4 [Magnetite] nanoparticles have magnetism that differs greatly from their bulk counterparts. Whereas bulk Fe3O4 is a ferrimagnet, single-domain Fe3O4 nanoparticles have been found to be superparamagnetic. This allows for increased magnetization of the nanoparticles compared to the bulk when in a magnetic field. For most paramagnets, magnetization requires applied fields of a few Tesla at low temperatures. This is achievable through the application of superconducting magnets. In superparamagnets, the high susceptibility of the particles allows magnetization through a Nd-Fe-B permanent magnet at room temperature. This is caused by an increased number of magnetic atoms within the particles, which greatly increases susceptibility of the particles. 57Co [Cobalt-57] Mössbauer Spectroscopy allows the probing of the internal environment of an iron nucleus, which gives insight into the magnetic properties of the Fe3O4 nanoparticles.

Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Share

COinS