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Superparamagnetic γ-Fe2O3 nanoclusters in silicate matrices |
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| Authors: | Yu. V. Maksimov I. P. Suzdalev V. N. Ikorskii O. G. Ellert V. M. Novotortsev M. V. Tsodikov J. A. Navio |
| Affiliation: | (1) Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia;(2) International Tomography Center, Siberian Division, Russian Academy of Sciences, Institutskaya ul. 3a, Novosibirsk, 630090, Russia;(3) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(4) Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia;(5) Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, and Dpto. de Quimica Inorganica, Universidad de Sevilla, 41092 Sevilla, Spain |
| Abstract: | Superparamagnetic γ-Fe2O3 nanoclusters have been synthesized on the surfaces of activated layered silica (ALS) and activated mesoporous silica gel (AMS). According to 300-K Mössbauer spectroscopy data and magnetization measurements between 2 and 300 K, the size of the γ-Fe2O3 nanoclusters increases from 2–3 to s~6–8 nm as the Fe content of ALS increases from 2.5 and 4.5 to 18.5 wt %. The 2.5 wt % Fe/ALS sample contains superparamagnetic γ-Fe2O3 nanoclusters uniform in size and magnetic properties. The nanoclusters produced on the AMS surface are larger and are nonuniform in magnetic properties. |
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