The study of Fe nanoparticles, obtained by the Chemical Liquid Deposition Technique (CLD) [2], has great interest due to their magnetic and electronic properties [1]. Fe colloids were prepared by cocondensation of the metal at 77K with three different solvents.The particle size , determined by TEM, of the colloidal dispersions ranges from 3.94 nm to 6.70 nm. Electron diffraction exhibits the presence of FeO. Electrophoretic measurements such as colloid charge and zeta potential show the electrical charge of the colloids. The electrophoretic mobility reveals positive charge for Fe-2-methoxyethanol and Fe-2-propanol colloids being μ=3.42*10^-9 and 3.87*10^-9 m²/V s, respectively. The colloids showed very high stability at room temperature, some of them over 6 months.

The UV-VIS for ethanol shows two adsorption bands at 201 and 320 nm, respectively which are coincident with theoretical spectrum calculated by Creighton [3].

The FTIR analysis of the solids shows two bands at 182 cm^-1 to the ν Fe-Fe and other band at 480 cm^-1 assigned to the ν Fe-O. The TGA was carried out between 25 to 550^º C. The solids are very stable with a maximum weight loss of 40% near 240^º C. The magnetic measurements indicate a histeresis magnetic moment vs applied field that correspond to a soft ferromagnetic system.

Acknowledgements

The authors would like to thank the financial support of Grant FONDECYT 1040456.

References

[1] Anon, Chem. Mater, 8, 1569-2193 (1996).

[2] Active Metals. Preparation, Characterization and Applications, VCH, Weinheim, Germany p.236-278 ,1996.

[3] Creighton J. A, J. Chem. Soc. Faraday. Trans, 87,3881 (1991).

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1. Synthesis and Characterization of Gadolinium colloids in 2-methoxyethanol