NDLI: The effect of magnetically induced linear aggregates on proton transverse relaxation rates of aqueous suspensions of polymer coated magnetic nanoparticles

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Nanoscale Vol - 5 Issue - 4

Nanoscale Vol - 5 Issue - 3

The effect of magnetically induced linear aggregates on proton transverse relaxation rates of aqueous suspensions of polymer coated magnetic nanoparticles

Content Provider	Royal Society of Chemistry (RSC)
Author	Shaw, Jeremy Saville, Steven L. Varsani, Rahi R. Tokarev, Alexander House, Michael J. Qi, Bin Mefford, O. Thompson Woodward, Robert C. Saunders, Martin Hammers, Jacob Pierre, Tim G. St
Copyright Year	2013
Abstract	It has been recently reported that for some suspensions of magnetic nanoparticles the transverse proton relaxation rate, R2, is dependent on the time that the sample is exposed to an applied magnetic field. This time dependence has been linked to the formation of linear aggregates or chains in an applied magnetic field via numerical modeling. It is widely known that chain formation occurs in more concentrated ferrofluids systems and that this has an affect on the ferrofluid properties. In this work we examine the relationships between colloidal stability, the formation of these linear structures, and changes observed in the proton transverse relaxation rate of aqueous suspensions of magnetic particles. A series of iron oxide nanoparticles with varying stabilizing ligand brush lengths were synthesized. These systems were characterized with dynamic light scattering, transmission electron microscopy, dark-field optical microscopy, and proton transverse relaxation rate measurements. The dark field optical microscopy and R2 measurements were made in similar magnetic fields over the same time scale so as to correlate the reduction of the transverse relaxivity with the formation of linear aggregates. Our results indicate that varying the ligand length has a direct effect on the colloidal arrangement of the system in a magnetic field, producing differences in the rate and size of chain formation, and hence systematic changes in transverse relaxation rates over time. With increasing ligand brush length, attractive inter-particle interactions are reduced, which results in slower aggregate formation and shorter linear aggregate length. These results have implications for the stabilization, characterization and potentially the toxicity of magnetic nanoparticle systems used in biomedical applications.
Starting Page	2152
Ending Page	2163
Page Count	12
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	5
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c3nr32979h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ferrofluid Iron oxide Transmission electron microscopy Dynamic light scattering Ligand Nanoparticle Optical microscope Proton Correlation and dependence Magnetic field
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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