Block Copolymer-Mediated Formation of Superparamagnetic Nanocomposites

    Authors

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

    Comments

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    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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