Theory and Simulation of highly concentrated model ferrofluids in external fields
Final Report Abstract
The influence of chain aggregates on magnetic properties of aggregated ferrofluids has been studied. The comparison, made with experimental data, has proved that the chain aggregate formation results in an increase of the initial magnetic susceptibility and magnetization. The structure of chain-like and ring-like aggregates has been investigated for ferrofluid monolayers, the effect of the geometrical constraints on the entropy of the system was revealed. It has been shown that the ground state for a ferroparticle cluster depends on the polydispersity and an external magnetic field in a complex manner. The influence of chain aggregates on rheological properties and structure factor of ferrolfuids has been studied. The existence of chain aggregates leads to an increase of the viscosity of magnetic suspension. Structure factor of high-coupling magnetic fluids has been shown to be quite sensitive to chain aggregates. In order to verify theoretical results various simulation approaches were developed. New features were implemented in open-source software package ESPResSo (www.espressomd.org), making our tools available for the scientists investigating dipolar fluids all over the world. The joint research allowed us to obtain new important physical results about magneto-dipole correlations in magnetic fluids, thus refining the applications of ferrofluids and opening new perspectives in creating smart magnetic materials, such as magnetic gels, magnetic rods, magnetically caped colloids, and magnetic Janus particles.
Publications
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Magnetic properties of polydisperse ferrofluids: A critical comparison between experiment. theory, and computer simulation. Phys. Rev. E, 2007, V. 75, No. 6, P. 061405-12
Ivanov A.O., Kantorovich S.S., Reznikov E.N., Holm C., Pshenichnikov A.F., Lebedev A.V., Chremos A., Camp P.J.
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Aggregate formation in ferrofluid monolayers: simulations and theory. J. Phys.- Condens. Mat., 2008, V. 20, P. 204125-5
Cerda J., Kantorovich S., Holm C.
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Microstructure analysis of monodisperse ferrofluid monolayers: theory and simulation. Phys. Chem. Chem. Phys, 2008, V. 10, No. 14, P. 1883-1895
S. Kantorovich, J.J. Cerda, and C. Holm
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Ground state structures in ferrofluid monolayers. Phys. Rev. E, 2009, V. 80, N 3, P. 031404-13
Prokopieva T.A., Danilov V.A., Kantorovich S., Holm C
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How to analyse the structure factor in ferrofluids with strong magnetic interactions: a combined analytic and simulation. Mol. Phys., 2009, V. 107, Nos. 4–6, P. 571-590
Pyanzina E., Kantorovich S., Cerda J., Ivanov A., Holm C.
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Ferrofluids with shifted dipoles: ground state structure. Soft Matter, 2011, V. 7, P. 5217-5227
Kantorovich S., Weeber R., Cerda J., Holm C.
