Simulation of the ferrofluid filled with a mixture of spherical and ellipsoidal magnetic particles
https://doi.org/10.21869/2223-1528-2026-16-1-57-67
Abstract
The purpose ‒ to develop a model of a ferrofluid whose magnetic filler consists of nanoparticles of two shapes: spheres and prolate spheroids, which must be taken into account when describing magnetic and steric interactions; based on the proposed model, to investigate the magnetic properties of the ferrofluid.
Methods. The simulation is performed within the framework of the coarse-grained molecular dynamics approach. The ferrofluid is represented as a collection of particles of two shapes: 1) spherical, simulated using the Lennard-Jones potential, and 2) prolate ellipsoids of revolution, described by the anisotropic Gay-Berne potential. A mixed potential is introduced to model steric interactions between particles of different types. The magnetic state of an elongated particle is simulated by a chain of point dipoles oriented along the major axis of the spheroid. Thermal fluctuations in the ferrofluid are simulated by incorporating a Langevin thermostat into the system.
Results. A series of test calculations were performed on ferrofluid samples with different ratios of the two particle types but the same total volume concentration of the magnetic filler. Quasi-static magnetization curves were obtained for the samples, which showed, in particular, an increase in the magnetic susceptibility of the ferrofluid upon the inclusion of ellipsoidal particles.
Concluson. A model of a ferrofluid filled with spherical and prolate ellipsoidal particles has been proposed, with corresponding spatial potentials used to simulate their steric interactions. Test calculations on samples with different ratios of the two particle types demonstrated the functionality and physical adequacy of the developed model. The further development of the proposed approach is primarily associated with adding the capability to describe the polydispersity of anisotropic particles.
Supporting agencies: The study was fulfilled in a framework of realization of program of Russian Federal Agency for Scientific Organization, theme number 126020916888-9
About the Author
P. V. Melenev
Institute of Continuous Media Mechanics of Perm Federal Research Center of Ural branch of Russian Academy of Science
Russian Federation
Russian Federation
Petr V. Melenev - Candidate of Sciences (Physics and Mathematics), Researcher. Researcher: K-5135-2014
1 A. Korolev Str., Perm 614013
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Review
For citations:
Melenev P.V. Simulation of the ferrofluid filled with a mixture of spherical and ellipsoidal magnetic particles. Proceedings of the Southwest State University. Series: Engineering and Technology. 2026;16(1):57-67. (In Russ.) https://doi.org/10.21869/2223-1528-2026-16-1-57-67
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