Title

Block Copolymer-Mediated Formation of Superparamagnetic Nanocomposites

Authors

Authors

S. Biswas; K. D. Belfield; R. K. Das; S. Ghosh;A. F. Hebard

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Chem. Mat.

Keywords

IRON-OXIDE NANOPARTICLES; OPENING METATHESIS POLYMERIZATION; MAGNETIC; NANOPARTICLES; DIBLOCK COPOLYMERS; CONTRAST AGENTS; NORBORNENE; SIZE; MAGHEMITE; POLYMERS; ACID; Chemistry, Physical; Materials Science, Multidisciplinary

Abstract

Well-defined diblock copolymers of bicyclo[2.2.1]hept-5-ene-2-carboxylic acid oxiranylmethyl ester, having both anchoring and steric stabilizing blocks in a 1:1 ratio, have been prepared by ring-opening metathesis polymerization (ROMP). The epoxy-containing block copolymer stabilized in situ generated iron oxide (gamma-Fe(2)O(3)) nanoparticles. The epoxy ester group provided strong chelation between the iron-oxide nanoparticle and the polymeric siderophores, producing a stable magnetic nanocomposite. The polymers were characterized by (1)H NMR, GPC, TGA, and DSC. The morphology and crystalline structure of the maghemite-block copolymer nanocomposites were evaluated with TEM and XRD, revealing highly crystalline, monodisperse gamma-Fe(2)O(3) nanoparticles with an average size of 3-5 mm. Interactions between the maghemite nanoparticles and the polymer were observed by FTIR. SQUID magnetometric analysis of the nanocomposites demonstrated superparamagnetism at room temperature with high saturation magnetization.

Journal Title

Chemistry of Materials

Volume

21

Issue/Number

23

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

5644

Last Page

5653

WOS Identifier

WOS:000272084500016

ISSN

0897-4756

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