Magnetic properties of multi-walled carbon nanotube - epoxy composites

ZILLI DARIO,; CLAUDIO CHILLOTTE,; ESCOBAR MARIANO,; BEKERIS VICTORIA,; RUBIOLO GERARDO,; CUKIERMAN AL,; GOYANES, SILVIA

POLYMER

Elsevier

Lugar: Amsterdam; Año: 2005 vol. 46 p. 6090 - 6095

0032-3861

Abstract Epoxy matrix composites have been prepared using as filler different weight fractions (0.03?1 wt%) of CVD grown multi-walled carbon nanotubes (MWCNTs) containing trapped iron nanoparticles. Magnetic characterization performed at room temperature with magnetic field between K19 and 19 kG shows that the nanocomposites are weakly ferromagnetic at room temperature. An abrupt variation in the dependence of both the coercivity field, BC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZ dependence of both the coercivity field, BC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZ dependence of both the coercivity field, BC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZ dependence of both the coercivity field, BC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZ K19 and 19 kG shows that the nanocomposites are weakly ferromagnetic at room temperature. An abrupt variation in the dependence of both the coercivity field, BC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZBC, and remanent magnetization, MR, with the weight fraction of MWCNTs, f, was found for fZ 0.4%. Results suggest the formation of MWCNTs agglomerates for increasing weight concentrations, in accordance with SEM micrographs. Keywords: Epoxy matrix; Carbon nanotubes; Magnetic properties