Fe2O3 and Gd2O3 Nanoparticles Embedded in Mesoporous Silica: Magnetic Properties Comparison
O. Kapustaa, A. Zeleňáková a, P. Hrubovčák a, V. Girman a and V. Zeleňák b
aInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
bInstitute of Chemistry, Faculty of Sciences, P.J. Šafárik University, Moyzesova 11, 040 01 Košice, Slovakia
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Nanocomposite materials containing Fe2O3 and Gd2O3 nanoparticles with the same concentration were prepared by nanocasting method. At this procedure silica matrix serves as nanoreactor for growth of nanoparticles. Temperature and external dc field dependences of the magnetization both samples were compared. Composite containing Fe2O3 nanoparticles shows superparamagnetic behaviour with blocking temperature around 45 K. Otherwise, paramagnetic properties were observed for the sample with Gd2O3 (above 10 K). Additionally, due to free pores the silica matrix could serve as medium to increase the number of bonded water molecules. These properties together with appropriate magnetic characteristics make studied materials suitable for magnetic resonance imaging applications.

DOI: 10.12693/APhysPolA.131.860
PACS numbers: 07.78.+s, 47.11.Kb, 75.75.Cd, 75.40.Cx, 78.20.-e