| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Skumiel, Andrzej
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2016The influence of oxidation process on exchange bias in egg-shaped FeO/Fe<inf>3</inf>O<inf>4</inf> core/shell nanoparticlescitations
- 2013Investigation of ultrasonic emulsifying processes of a linseed oil and water mixturecitations
- 2012Thermophysical and magnetic properties of carbon beads containing cobalt nanocrystallitescitations
- 2011Thermophysical and magnetic properties of carbon beads containing nickel nanocrystallitescitations
- 2011Structuring from nanoparticles in oil-based ferrofluidscitations
- 2011Magnetically induced anisotropy of electric permittivity in the PDMS ferromagnetic gelcitations
- 2010Effect of poly(Ethylene Glycol) coating on the acoustic properties of biocompatible magnetic fluidcitations
- 2009Magnetic properties and heating effect in bacterial magnetic nanoparticlescitations
- 2008The effect of temperature on the electric conductivity of poly(dimethyl siloxane) ferromagnetic gelcitations
Places of action
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article
Structuring from nanoparticles in oil-based ferrofluids
Abstract
<p>The effect of magnetic field on the structure formation in an oil-based magnetic fluid with various concentrations of magnetite particles was studied. The evaluation of the experimental data obtained from small-angle X-ray scattering and ultrasonic attenuation indicates the formation of chain-like aggregates composed of magnetite particles. The experimental data obtained from ultrasonic spectroscopy fit well with the recent theoretical model by Shliomis, Mond and Morozov but only for a diluted magnetic fluid. In this model it is assumed that a dimer is the main building block of a B-field-induced chain-like structure, thus the estimation of the nematic order parameter does not depend on the actual length of the structure. The scattering method used reveals information about the aggregated structure size and relative changes in the degree of anisotropy in qualitative terms. The coupling constant ?, concentrations f, average particle size d and its polydispersity s were initially obtained using the vibrating sample magnetometry and these results were further confirmed by rheometry and scattering methods. Both the particles' orientational distribution and the nematic order parameter S were inferred from the ultrasonic measurements. The investigation of SAXS patterns reveals the orientation and sizes of aggregated structures under application of different magnetic-field strengths. In addition, the magnetic-field-dependent yield stress was measured, and a relationship between the yield stress and magnetic-field strength up to 0.5T was established. © EDP Sciences / Società Italiana di Fisica / Springer-Verlag 2011.</p>