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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.87: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Synthesis of homo- and heterometallic two-layer nanoparticles as labels for magnetic biochips — •Nadezhda Kataeva1,2, Sergey Pavlovich Gubin2, Joerg Schotter1, and Hubert Brückl1 — 1Austrian Research Centers GmbH - ARC, Nano-System-Technologies, Tech Gate Vienna, Donau-City-Strasse 1, 1220 Vienna, Austria — 2N.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii pr. 31, Moscow, 119991 Russia
We will present our results on the development of ferromagnetic nanoparticles with properties optimized for the application as labels for magnetic biochips. This application requires functionalized magnetic nanoparticles that are stabilized in aqueous solutions and posses high magnetic moments. Thus, we synthesize magnetic nanoparticles from materials with high saturation magnetization (e.g. CoFe alloys) and plan to increase the diameter of the particles from our initial value of about 10 nm up to about 50 nm, which poses a good compromise between high magnetic moment of the nanoparticles and good binding properties to surface-immobilized molecules. We obtain magnetic nanoparticles of complex composition with different functional groups by the reduction of water-soluble salts of cobalt or iron by NaBH4. Ethylenediamine, different amino acids, surfactants, polyacrylic acid, polyvinyl alcohol, polydimethylsiloxane and other lyophylic coatings are employed as functional shells of the nanoparticles. For the synthesis of steady suspensions in organic solvents, the reaction was carried out in a two-phase system of hexane/water and with surfactants.