Block Copolymer-Mediated Formation of Superparamagnetic Nanocomposites

被引：18

作者：

Biswas, Sanchita ^{[1
]}

Belfield, Kevin D. ^{[1
]}

Das, Ritesh K. ^{[2
]}

Ghosh, Siddhartha ^{[2
]}

Hebard, Arthur F. ^{[2
]}

机构：

[1] Univ Cent Florida, Dept Chem, Orlando, FL 32816 USA

[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 23期

基金：

美国国家科学基金会;

关键词：

OPENING METATHESIS POLYMERIZATION; IRON-OXIDE NANOPARTICLES; MAGNETIC NANOPARTICLES; DIBLOCK COPOLYMERS; CONTRAST AGENTS; MAGHEMITE; SIZE; FUNCTIONALIZATION; NANOCRYSTALS; REACTIVITY;

D O I：

10.1021/cm902854d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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-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 H-1 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-Fe2O3 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.

引用

页码：5644 / 5653

页数：10

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