Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 12, Pages 6869-6875Publisher
SPRINGER
DOI: 10.1007/s11051-011-0594-6
Keywords
Ferrofluid; Dynamic light scattering; Fluorescence correlation spectroscopy; Hydrodynamic radius
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Funding
- NSF [DMR-0605900]
- REU [EEC-0552772]
- American Chemical Society [PRF 46160-G10]
- Richard Barber Foundation
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We have synthesized iron oxide nanoparticles coated with a monolayer of dextran, with molecular weights of the polymer between 5 and 670 kDa. Transmission electron microscopy images confirm that the hard core has a crystalline diameter of approximately 12 nm. The hydrodynamic diameters of these coated nanoparticles in solution measured using dynamical light scattering and estimated from magnetic susceptibility studies vary from near 90 nm for the lightest polymer to 140 nm for the heaviest polymer. Conversely, fluorescence correlation spectroscopy measurements yield a diameter of approximately 55 nm for the 15-20 kDa dextran coated nanoparticles, which is consistent with the expected value estimated from the sum of the hard-core diameter and monolayer dextran coating. We discuss the implications of this discrepancy for applications involving polymer-coated magnetic nanoparticles.
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