2026-04-20T23:39:00Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/63352024-04-10T10:43:56Zcom_20.500.11984_473col_20.500.11984_478

Gómez, Ainara Berasategi Arostegi, Joanes Bou-Ali, M. Mounir 2024-04-10T08:12:36Z 2024-04-10T08:12:36Z 2024 0304-8853 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=175903 https://hdl.handle.net/20.500.11984/6335 In this work magnetic fluids at two different volume concentrations (5 % and 10 %) of magnetite nanoparticles of different morphologies and sizes (octahedral, 38 ± 5 nm; truncated octahedral, 10 ± 1 nm; rod-like, 95 nm x 10 nm; spherical 33 ± 20 and 90 ± 10 nm) have been formulated (by using mineral oil as liquid carrier and Aerosil®300 as viscosity-controller agent) and fabricated. The obtained results allow us to conclude that: a) the fluid with 10 %vol concentration spherical nanoparticles presents the highest magnetorheological response observed in this study, over a 4000 % change of yield stress with the maximum applied field strength. This is due both to their highest magnetic saturation and an effective nanoparticle clustering; b) the fluid based on octahedral particles shows a good balance between magnetorheological response (up to a 795 % change of yield stress) and reversibility (up to a 92 %), which indicates the competitiveness of these particles for the formulation of magnetic fluids. On the contrary, truncated octahedral nanoparticles, although maintaining that high reversibility capability, present a poor MR response (75–95 % change of yield stress for 5 and 10 %vol. concentrations); c) the poor magnetorheological response observed and non-expected reversibility behavior obtained for rod-like particles indicate that further deepening of the understanding of their dispersion and internal structuring is needed. eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2024 The Authors Magnetite Magnetic nanoparticles Morphology magnetorheological fluids Influence of nanoparticles morphology in magnetic fluids http://purl.org/coar/resource_type/c_6501