Influence of Surface Active Substances on Magnetic Properties of Goethite Nanoparticles
To receive monosized goethite (α-FeOOH) nanoparticles powders in the process of chemical precipitation of iron salt and alkali various surface active substances (SAS) with concentration of 0.3% were added to water: C12H25NaO4S (anion active), C12H38ClN (cation active) and EDTA – C10H14O8N2Na2 (complexon). It has been determined that the magnetic properties of the nanoparticles under investigation change in comparison with the nanoparticles obtained without SAS addition. In all the samples under study very interesting saturation magnetization temperature dependences have been obtained. They indicate the difference in goethite temperature phase transformations connected with various surface layers formed on the nanoparticles under SAS influence.
J.-L. Bobet, B. Chevalier and D. Fruchart
A. A. Novakova et al., "Influence of Surface Active Substances on Magnetic Properties of Goethite Nanoparticles", Solid State Phenomena, Vol. 170, pp. 160-164, 2011