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Synthesis and Magnetic Investigation of Ordered Mesoporous Two-Line Ferrihydrite

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Tüysüz,  Harun
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Salabaş,  Elena Lorena
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weidenthaler,  Claudia
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Tüysüz, H., Salabaş, E. L., Weidenthaler, C., & Schüth, F. (2008). Synthesis and Magnetic Investigation of Ordered Mesoporous Two-Line Ferrihydrite. Journal of the American Chemical Society, 130(1), 280-287. doi:10.1021/ja075528j.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-90B1-8
Abstract
We report here for the first time on the synthesis and characterization of ordered mesoporous two-line ferrihydrite. Ordered mesoporous ferrihydrite has been prepared via the nanocasting route. Two types of ordered mesoporous silica, two-dimensional hexagonal SBA-15 and three-dimensional cubic KIT-6, were employed as hard templates. The magnetic behavior of ferrihydrite replicas with an average diameter of about 7 nm was investigated by direct current magnetometry. The temperature dependence of magnetization shows a superparamagnetic transition around 70 K. Field-induced changes in the low-field behavior of the magnetization were observed below 30 K. The results are explained assuming a spin-glass-like state of the surface spins. The 2D hexagonal two-line ferrihydrite showed very large coercivity up to 1.6 kOe at 5 K.