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The synthesis of clusters of iron oxides in mesopores of monodisperse spherical silica particles |
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| Authors: | Stovpiaga E Yu Eurov D A Kurdyukov D A Smirnov A N Yagovkina M A Grigorev V Yu Romanov V V Yakovlev D R Golubev V G |
| Institution: | 1.Ioffe Institute, St. Petersburg, Russia ;2.ITMO University, St. Petersburg, Russia ;3.Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia ;4.Experimentelle Physik 2, Technische Universitat at Dortmund, Dortmund, Germany ; |
| Abstract: | The method of obtaining nanoclusters α-Fe2O3 in the pores of monodisperse spherical particles of mesoporous silica (mSiO2) by a single impregnation of the pores with a melt of crystalline hydrate of ferric nitrate and its subsequent thermal destruction has been proposed. Fe3O4 nanoclusters are synthesized from α-Fe2O3 in the pores by reducing in thermodynamically equilibrium conditions. Then particles containing Fe3O4 were annealed in oxygen for the conversion of Fe3O4 back to α-Fe2O3. In the result, the particles with the structure of the core-shell mSiO2/Fe3O4@mSiO2/α-Fe2O3 are obtained. The composition and structure of synthesized materials as well as the field dependence of the magnetic moment on the magnetic field strength have been investigated. |
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