Block copolymer-mediated formation of superparamagnetic nanocomposites

Kevin D. Belfield, Sanchita Biswas, Ritesh K. Das, Siddhartha Ghosh, Arthur F. Hebard

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

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 (γ-Fe2O3) 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 1H 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 γ-Fe2O3 nanoparticles with an average size of 3-5 nm. 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.

Original languageEnglish (US)
Pages (from-to)5644-5653
Number of pages10
JournalChemistry of Materials
Volume21
Issue number23
DOIs
StatePublished - Dec 8 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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