Synthesis and magnetic investigation of ordered mesoporous two-line ferrihydrite

被引：99
|
作者：
Tueysuez, Harun [1 ]
Salabas, Elena Lorena [1 ]
Weidenthaler, Claudia [1 ]
Schueth, Ferdi [1 ]
机构：
[1] Max Planck Inst Kohlenforsch, D-45470 Mulheim An Der Ruhr, Germany
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 01期
关键词：
D O I：
10.1021/ja075528j
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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 spinglass-like state of the surface spins. The 2D hexagonal two-line ferrihydrite showed very large coercivity up to 1.6 kOe at 5 K.
引用
收藏
页码：280 / 287
页数：8
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