Magnetic properties of carbon nano-particles produced by a pulsed arc submerged in ethanol

被引:37
作者
Parkansky, N. [1 ]
Alterkop, B. [1 ]
Boman, R. L. [1 ]
Leitus, G. [2 ]
Berkh, O. [3 ]
Barkay, Z. [4 ]
Rosenberg, Yu. [4 ]
Eliaz, N. [5 ]
机构
[1] Tel Aviv Univ, Elect Discharge & Plasma Lab, IL-69978 Tel Aviv, Israel
[2] Weizmann Inst Sci, Dept Chem Res Support, IL-76100 Rehovot, Israel
[3] Tel Aviv Univ, Sch Elect Engn, IL-69978 Tel Aviv, Israel
[4] Tel Aviv Univ, Wolfson Appl Mat Res Ctr, IL-69978 Tel Aviv, Israel
[5] Tel Aviv Univ, Sch Mech Engn, IL-69978 Tel Aviv, Israel
关键词
Carbon - Ethanol - Magnetic properties - Magnetization;
D O I
10.1016/j.carbon.2007.11.008
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 [物理化学]; 081704 [应用化学];
摘要
Carbon powder was produced by a pulsed arc ignited between two carbon electrodes submerged in ethanol, and was comprised of both micro- and nano-particles. The measured magnetic properties of the mixed "raw" powder at 20 and 300 K were: saturation magnetization M-s similar to 0.90-0.93 emu/g, residual magnetization M-r = 0.022 and 0.018 emu/g, and coercive force H-c = 11 and 8 Oe, respectively The data lead to conclusion that the powder consisted of ferromagnetic particles with a critical temperature much higher than 300 K. Magnetic particles in solution were separated by means of bio-ferrography It was found that the magnetically separated particles included chains of similar to 30-50 nm diameter spheres, and nanotubes and nanorods with lengths of 50-250 nm and diameters of 2030 nm. In contrast, the residual particles which passed through the bio-ferrograph consisted of 1 pm and larger micro-particles, and nano-particles without any definite shape. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:215 / 219
页数:5
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