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200517.fm Page 245 Friday, March 18, 2005 2:52 PM
2005
Nanotechnology
V 1505
Single Crystalline Magnetite Nanotubes. — Single crystalline Fe 3O4 nanotubes are
synthesized by wet etching of the MgO inner cores of MgO/Fe3O4 core—shell nano17- 225 wires
in (NH4)2SO 4 solution at 80 °C for about 1.5 h. The samples are characterized by
SEM and TEM. The length, inner diameter, and wall thickness of the nanotubes can be
easily and independenly controlled by tuning the length and diameter of the MgO cores
and the deposition time/rate of the shell. Fe3O4 nanotubes may potentially serve as tunable fluidic channels for tiny magnetic particles, data storage devices in nanocircuits,
and scanning tips for magnetic force microscopes. — (LIU, Z.; ZHANG, D.; HAN, S.;
LI, C.; LEI, B.; LU, W.; FANG, J.; ZHOU*, C.; J. Am. Chem. Soc. 127 (2005) 1, 6-7;
Dep Electr. Eng. Electrophys., Univ. South. Calif., Los Angeles, CA 90089, USA;
Eng.) — W. Pewestorf
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