Interaction between magnetic agglomerates and an extended free radicals network studied by magnetic resonance

• Autorzy: Niko Guskos , Grzegorz Zolnierkiewicz , Janusz Typek , Aleksander Guskos , Pawel Berczynski , Dimitri Petridis
• Języki publikacji: EN

Abstrakty

EN

Solids containing an extended network of free radicals have been prepared and studied by magnetic resonance techniques in the 4–290 K temperature range. One solid contained additionally a small amount of magnetic γ-Fe2O3 in the form of nanoparticle agglomerates. The solid without agglomerates displayed only a narrow, single resonance line centered at g eff = 2.0043. The magnetic resonance measurements of the solid with γ-Fe2O3 agglomerates gave a spectrum composed of two lines attributed to two different magnetic centers: a narrow line due to free radicals and a broad line arising from magnetic iron oxide agglomerates. In the high temperature range the integrated intensities of both lines decreased with decreasing temperature. The resonance field of the broad line shifted to lower magnetic fields upon lowering the temperature with the gradient ΔH r/ΔT = 2.3 G/K, while the narrow line shifted towards higher magnetic fields. The linewidth of the broader line increased with decreasing temperature while for the narrow lines in both samples this change was small. The magnetic iron oxide clusters produce a magnetic field which acts on the free radicals network and its strength depends essentially on the concentration of clusters. The reorientation process in the free radicals network is more intense in the sample without magnetic clusters.

Słowa kluczowe

EN

magnetic resonance; free radicals; magnetic agglomerates

• Czasopismo: Open Physics
• Rocznik: 2012
• Tom: 10
• Numer: 1
• Strony: 166-171

Daty

wydano

2012-02-01

online

2011-12-03

Twórcy

autor

Niko Guskos

autor

Grzegorz Zolnierkiewicz

• Institute of Physics, West Pomeranian University of Technology, Al. Piastow 48, 70-311, Szczecin, Poland

autor

Janusz Typek

• Institute of Physics, West Pomeranian University of Technology, Al. Piastow 48, 70-311, Szczecin, Poland,

autor

Aleksander Guskos

• Institute of Physics, West Pomeranian University of Technology, Al. Piastow 48, 70-311, Szczecin, Poland

autor

Pawel Berczynski

• Institute of Physics, West Pomeranian University of Technology, Al. Piastow 48, 70-311, Szczecin, Poland

autor

Dimitri Petridis

• NCSR “Demokritos”, Aghia Paraskevi, Attikis, Athens, Greece

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Identyfikatory

DOI

10.2478/s11534-011-0085-5