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

共 62 条

[21] An organometallic approach for very small maghemite nanoparticles: Synthesis, characterization, and magnetic properties [J].

Glaria, Arnaud ;

Kahn, Myrtil L. ;

Falqui, Andrea ;

Lecante, Pierre ;

Colliere, Vincent ;

Respaud, Marc ;

Chaudret, Bruno .

CHEMPHYSCHEM, 2008, 9 (14) :2035-2041

[22] Magnetite nanoparticle dispersions stabilized with triblock copolymers [J].

Harris, LA ;

Goff, JD ;

Carmichael, AY ;

Riffle, JS ;

Harburn, JJ ;

St Pierre, TG ;

Saunders, M .

CHEMISTRY OF MATERIALS, 2003, 15 (06) :1367-1377

[23] Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process [J].

Hyeon, T ;

Lee, SS ;

Park, J ;

Chung, Y ;

Bin Na, H .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (51) :12798-12801

[24]

IVIN JCM, 1997, OLEFIN METATHESIS ME, pCH11

[25] Concentration effects of methylalumoxane, palladium and nickel pre-catalyst and monomer in the vinyl polymerization of norbornene [J].

Janiak, C ;

Lassahn, PG .

POLYMER BULLETIN, 2002, 47 (06) :539-546

[26] Nanoinclusions in dry polymer brushes [J].

Kim, JU ;

O'Shaughnessy, B .

MACROMOLECULES, 2006, 39 (01) :413-425

[27] PARTICLE SIZE DEPENDENCE OF COERCIVITY AND REMANENCE OF SINGLE-DOMAIN PARTICLES [J].

KNELLER, EF ;

LUBORSKY, FE .

JOURNAL OF APPLIED PHYSICS, 1963, 34 (03) :656-&

[28] Polymer-coated ferromagnetic colloids from well-defined macromolecular surfactants and assembly into nanoparticle chains [J].

Korth, Bryan D. ;

Keng, Pei ;

Shim, Inbo ;

Bowles, Steven E. ;

Tang, Chuanbing ;

Kowalewski, Tomasz ;

Nebesny, Kenneth W. ;

Pyun, Jeffrey .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (20) :6562-6563

[29] Synthesis of magnetite nanoparticles for bio- and nanotechnology:: Genetic engineering and biomimetics of bacterial magnetosomes [J].

Lang, Claus ;

Schueler, Dirk ;

Faivre, Damien .

MACROMOLECULAR BIOSCIENCE, 2007, 7 (02) :144-151

[30] Insight into microstructural and magnetic properties of flame-made γ-Fe2O3 nanoparticles [J].

Li, Dan ;

Teoh, Wey Yang ;

Selomulya, Cordelia ;

Woodward, Robert C. ;

Munroe, Paul ;

Amal, Rose .

JOURNAL OF MATERIALS CHEMISTRY, 2007, 17 (46) :4876-4884

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