Interparticle interactions in agglomerates of alpha-Fe2O3 nanoparticles: influence of grinding

Journal of Colloid and Interface Science
Min XuSteen Mørup

Abstract

We have chemically prepared a sample of antiferromagnetic alpha-Fe2O3 nanoparticles by a gel-sol technique. Mössbauer spectra of the as-prepared sample showed that superparamagnetic relaxation was suppressed due to strong magnetic interparticle interactions even at room temperature. However, subsequent grinding of the sample by hand in a mortar for some minutes resulted in fast superparamagnetic relaxation of some of the particles. The effect was even more dramatic if the alpha-Fe2O3 powder was ground for a longer time or together with nonmagnetic eta-Al2O3 nanoparticles. Similar effects were found after low-energy ball milling. Thus it is found that the agglomeration of the nanoparticles during preparation under wet conditions results in strong magnetic interparticle interaction, but a relatively gentle mechanical treatment is sufficient to break up the agglomerates, resulting in much weaker interactions. We show that these effects can also be seen when a soil sample containing magnetic nanoparticles is ground.

Citations

Jan 1, 2010·Beilstein Journal of Nanotechnology·Steen MørupCathrine Frandsen
Jun 1, 2013·ISRN Toxicology·Sachindri Rana, P T Kalaichelvan
May 3, 2006·Journal of Physics. Condensed Matter : an Institute of Physics Journal·C R H BahlS Mørup
Jan 7, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D E MadsenS Mørup
Feb 9, 2005·Physical Review Letters·Cathrine Frandsen, Steen Mørup
May 14, 2021·International Journal of Biological Macromolecules·Fatih ÖzbaşSelcan Karakuş

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