Zagorodni، Andrei A. نويسنده , , Salazar-Alvarez، German نويسنده , , Muhammed، Mamoun نويسنده ,

روزنامه با شماره پیاپی سال 2008

5

377

381

Formation of elongated nanoparticles was observed when Fe3O4 was precipitated from solutions containing excess of Fe2+. The average diameter of the particles was 23 nm; the length to diameter ratio was up to 14. This shape was an unexpected phenomenon because bar- or needle-like nanoparticles have been earlier reported only for Fe(III)-based materials. Chemical analysis revealed Fe(OH)2 nature of the obtained particles. In addition, this conclusion was verified with a new simple method for quantitative evaluation of the particle morphology. Application of this method to the mixed Fe(OH)2=Fe3O4 samples allowed to distinguish between the two different compounds and to attribute different morphologies to Fe(OH)2 or Fe3O4: Results indicate that bars are frequent shapes of nano-sized iron oxides/ hydroxides.

Elongated nanoparticles , Nanoparticles , iron oxides , Spinel phases , Electron microscopy

Journal of Nanoparticle Research

2008

Journal of Nanoparticle Research

132325