Magnetic nanoparticles stabilized by organic polymer matrixes

Gleb Yurkov 2Maxim S. Korobov 2Yury A. Koksharov 1Ivan P. Dotsenko 2Denis A. Pankartov 1Dmitriy A. Astafiev 2Dmitry A. Baranov 2Oleg V. Popkov 2Alexandr K. Tsvetnikov 3Vyacheslav M. Bouznik 4Alexandr V. Kozinkin 5Sergey P. Gubin 2Alexander S. Fionov 6

1. M.V. Lomonosov Moscow State University, Vorobyevy gory, Moscow 119992, Russian Federation
2. N.S. Kurnakov Institute of General and Inorganic Chemistry RAS (IGIC RAS), GSP-1, Leninskii prosp., 31, Moscow 1199911, Russian Federation
3. Institute of Chemistry , Far East Division, RAS, Stoletiya Vladivostoka pr. 139, Vladivostok 690022, Russian Federation
4. Boreskov Institute of Catalysis, Siberian Division RAS, akademika Lavrent’eva pr. 5, Novosibirsk 630090, Russian Federation
5. Research Institute of Physics, Rostov State University, pr. Stachki 194, Rostov-on-Don 344104, Russian Federation
6. Institute of Radio Engineering and Electronics RAS (IRE RAS), Mokhovaya, 11, Moscow 125009, Russian Federation

Abstract

The great interest in polymer matrix composites containing metallic nanoparticles or cluster is motivated by wide application field of such materials: from catalysis to nanoelectronics. The polyethylene (PE), polyamides (PA), polypropylenes (PP), polystyrenes (PS) matrix are interesting as expansion and inexpensive polymers. The polytetrafluoroethylene (PTFE) matrix is very interesting because this polymer is very inert. At first glance, it would seem that poor solubility and swelling ability of PTFE in solvents hinder the introduction of different nanoparticles in this matrix and their uniform distribution over its bulk.
In searching for the solution of this problem, we have focused our attention of ultradispersed PTFE. The encapsulation was done by thermal decomposition of metallcontaining compounds (MCC) (MRn; M=Co, Fe, Cu, Ni, at all; R=CO, HCOO, CH3COO and other) in dispersion system of UPTFE in mineral oil; solution-melt PE (or PA, PP, PS) in mineral oil. Materials with concentration of a metallcontaining NP up 2 to 30 wt.% have been obtained. Nanocomposites were determined by TEM, XRD, EXAFS, Mössbauer spectroscopy and magnetic measurements. TEM studies showed that the nanoparticles (NP) are dispersed on the surface nanogranules of UPTFE matrix and in to volume polymer matrix (PE, PA, PP, PS). The used methods of researches were shown, which nanoparticles to have complex internal structure. The magnetic metering was shown the high magnetic anisotropy and coercivity (at 300K) for Co NP on the surface UPTFE 800Oe, in PE matrix coercivity Co NP - 590Oe; Fe - 960Oe; Fe2O3 NP - superparamagnetic.
This work was supported by the RFBR (02-03-32435, 04-03-32090, 04-03-32311, 04-03-32597), ISTC (project 1991), Russian Science Support Foundation and program of Russian Academy of Sciences "Critical Issues in the Physics and Chemistry of Nanoscale Systems and Nanomaterials".

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Presentation: poster at E-MRS Fall Meeting 2004, Symposium I, by Gleb Yurkov
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-30 09:04
Revised:   2009-06-08 12:55
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