Aspects Concerning the Fabrication of Magnetorheological Fluids Containing High Magnetization FeCo Nanoparticles
Jon Gutiérrez,
Virginia Vadillo,
Ainara Gómez,
Joanes Berasategi,
Maite Insausti,
Izaskun Gil de Muro,
M. Mounir Bou-Ali
Affiliations
Jon Gutiérrez
Faculty of Science and Technology, University of the Basque Country UPV/EHU, P. Box 644, 48080-Bilbao, Spain
Virginia Vadillo
BCMaterials (Basque Center for Materials, Applications and Nanostructures), UPV/EHU Scientific Park, Bldg. Martina Casiano, 3rd Floor, Barrio Sarriena s/n, 48940-Leioa, Spain
Ainara Gómez
Mechanical and Industrial Production Depertment, Faculty of Engineering, Mondragon Unibertsitatea, Loramendi 4, 20500 Arrasate-Mondragon, Spain
Joanes Berasategi
Mechanical and Industrial Production Depertment, Faculty of Engineering, Mondragon Unibertsitatea, Loramendi 4, 20500 Arrasate-Mondragon, Spain
Maite Insausti
Faculty of Science and Technology, University of the Basque Country UPV/EHU, P. Box 644, 48080-Bilbao, Spain
Izaskun Gil de Muro
Faculty of Science and Technology, University of the Basque Country UPV/EHU, P. Box 644, 48080-Bilbao, Spain
M. Mounir Bou-Ali
Mechanical and Industrial Production Depertment, Faculty of Engineering, Mondragon Unibertsitatea, Loramendi 4, 20500 Arrasate-Mondragon, Spain
Recently, our collaborative work in the fabrication of a magnetorheological fluid (MRF) containing high magnetization FeCo nanoparticles (NPs, fabricated in our laboratories using the chemical reduction technique; MS = 212 Am2/kg) as magnetic fillers have resulted in a new MRF with superior performance up to 616.7 kA/m. The MRF had a yield stress value of 2729 Pa and good reversibility after a demagnetization process. This value competes with the best ones reported in the most recent literature. Nevertheless, the fabrication process of this type of fluid is not an easy task since there is a strong trend to the aggregation of the FeCo NPs due to the strong magnetic dipolar interaction among them. Thus, now we present the analysis of some aspects concerning the fabrication process of our FeCo NPs containing MRF, mainly the type of surfactant used to cover those NPs (oleic acid or aluminium stearate) and its concentration, and the procedure followed (mechanical and/or ultrasound stirring) to achieve a good dispersion of those magnetic fillers within the fluid.