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Cited by 401

The DOI matches its Crossref record; 19 of the 19 references it cites were found in a registry or an index.

Magnetite Nanoparticle Dispersions Stabilized with Triblock Copolymers

Open access
Harris, L. A., Goff, J. D., Carmichael, A. Y., Riffle, J. S., Harburn, J. J., St. Pierre, T. G., Saunders, M.·2003·Chemistry of Materials
DOI 10.1021/cm020994n
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Abstract

Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Magnetite nanoparticles display strong ferrimagnetic behavior and are less sensitive to oxidation than magnetic transition metal nanoparticles such as cobalt, iron, and nickel. For in vivo applications, well-defined organic coatings are needed to surround the magnetite nanoparticles and prevent any aggregation. The goal of this research was to develop complexes of magnetite nanoparticles coated with well-defined hydrophilic polymers so that they could be dispersed in aqueous fluids. Focal points have included the following: (1) Investigations of polymer systems that bind irreversibly to magnetite at the physiological pH, (2) the design of block copolymers with anchor and tail blocks to enable dispersion in biological fluids, and (3) investigations of copolymer block lengths to maximize the concentration of bound magnetite. Hydrophilic triblock copolymers with controlled concentrations of pendent carboxylic acid binding groups were designed as steric stabilizers for magnetite nanoparticles. These copolymers were comprised of controlled molecular weight poly(ethylene oxide) tail blocks and a central, polyurethane anchor block containing carboxylic acids. Stoichiometric aqueous solutions of FeCl 2 and FeCl 3 were condensed by reaction with NH 4 OH to form magnetite nanoparticles, and then a dichloromethane solution of the block copolymer was added to adsorb the copolymer onto the magnetite surfaces. Stable magnetite dispersions were prepared with all of the triblock copolymers. The polymer−nanomagnetite conjugates described in this paper had a maximum saturation magnetization of 34 emu/g. Magnetization curves showed minimal hysteresis. Powder X-ray diffraction (XRD), selected area electron diffraction (SAED), and high-resolution electron microscopy (HREM) confirmed the magnetite crystal structure. Transmission electron microscopy (TEM) showed that the dispersions contained magnetite particles coated with the polymers with a mean diameter of 8.8 ± S.D. 2.7 nm.

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Metadata

Authors
Harris, L. A., Goff, J. D., Carmichael, A. Y., Riffle, J. S., Harburn, J. J., St. Pierre, T. G., & Saunders, M.
Venue
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Published
2003-02-28
Volume
15
Issue
6
Pages
1367-1377
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
DOI
10.1021/cm020994n
OpenAlex
W2083475016
Cited by
401
References
19
FWCI
15.63
Type
journal article
Language
en
Open access
green

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