Preparation and characterization of hollow magnetite spheres via a template-free route

被引：7
作者：
Dong, Qiang [1 ]
Kumada, Nobuhiro [1 ]
Yonesaki, Yoshinori [1 ]
Takei, Takahiro [1 ]
Kinomura, Nobukazu [1 ]
机构：
[1] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, Dept Res, Kofu, Yamanashi 4008511, Japan
来源：
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2010年 / 118卷 / 1376期
关键词：
Hollow magnetite spheres; Template-free; Hydrothermal; Ferromagnetic; FE3O4; PARTICLES; NANOPARTICLES; MICROSPHERES; NANOSPHERES; FABRICATION; FE2O3; GEL;
D O I：
10.2109/jcersj2.118.272
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Hollow magnetite (Fe3O4) spheres have been synthesized successfully via a template-free hydrothermal reaction using Fe-naphthenate and LiOH as the starting materials. The average diameter of hollow magnetite spheres prepared at 120 degrees C was about 10 mu m, and the specific surface area of the product was 68.3 m(2)/g. The size and morphology of the products depended on the reaction temperature, concentration of LiOH solution and the volume ratio of the oil (Fe-naphthenate) and water phase (LiOH solution). The hollow magnetite spheres exhibit ferromagnetic behavior with saturation magnetization (Ms), remanent magnetization (Mr), and coercivity (He) values of ca. 22 emu/g, 5 emu/g, and 530 Oe, respectively, according to the magnetic hysteresis curve measured at 5 K. The possible formation mechanism of hollow magnetite spheres is also discussed. (C) 2010 The Ceramic Society of Japan All rights reserved
引用
收藏
页码：272 / 277
页数：6
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