Block copolymer-mediated formation of superparamagnetic nanocomposites

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

doi:10.1021/cm902854d

Block copolymer-mediated formation of superparamagnetic nanocomposites

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

Research output: Contribution to journal › Article › peer-review

22 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 language	English (US)
Pages (from-to)	5644-5653
Number of pages	10
Journal	Chemistry of Materials
Volume	21
Issue number	23
DOIs	https://doi.org/10.1021/cm902854d
State	Published - Dec 8 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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title = "Block copolymer-mediated formation of superparamagnetic nanocomposites",

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.",

author = "Belfield, {Kevin D.} and Sanchita Biswas and Das, {Ritesh K.} and Siddhartha Ghosh and Hebard, {Arthur F.}",

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doi = "10.1021/cm902854d",

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T1 - Block copolymer-mediated formation of superparamagnetic nanocomposites

AU - Belfield, Kevin D.

AU - Biswas, Sanchita

AU - Das, Ritesh K.

AU - Ghosh, Siddhartha

AU - Hebard, Arthur F.

PY - 2009/12/8

Y1 - 2009/12/8

N2 - 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.

AB - 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.

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U2 - 10.1021/cm902854d

DO - 10.1021/cm902854d

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EP - 5653

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 23

ER -

Block copolymer-mediated formation of superparamagnetic nanocomposites

Abstract

All Science Journal Classification (ASJC) codes

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