Modified mean-field theory of the magnetic properties of concentrated, high-susceptibility, polydisperse ferrofluids

Autor: Alexey O. Ivanov, Ekaterina A. Elfimova, Philip J. Camp, Anna Yu. Solovyova
Jazyk: angličtina
Rok vydání: 2017
Předmět:
SIZE POLYDISPERSITY
Ferrofluid
COMPUTER SIMULATION
Materials science
PREDICTION
Dispersity
Monte Carlo method
POLYDISPERSE SYSTEMS
02 engineering and technology
01 natural sciences
MAGNETISM
POLYDISPERSITY
POLYDISPERSE FERROFLUIDS
MAGNETOSTATIC PROPERTIES
Physics::Fluid Dynamics
MAGNETIZATION CURVES
MEAN FIELD THEORY
INITIAL SUSCEPTIBILITY
0103 physical sciences
MODIFIED MEAN FIELDS
ARTICLE
010306 general physics
ANALYSIS AND CHARACTERIZATION
Condensed matter physics
PARTICLE SIZE
THEORETICAL STUDY
MAGNETIZATION
MONTE CARLO METHODS
MAGNETIC FLUIDS
021001 nanoscience & nanotechnology
Magnetic susceptibility
Characterization (materials science)
Condensed Matter::Soft Condensed Matter
SATURATION MAGNETIZATION
Mean field theory
CURVE FITTING
MONTE CARLO METHOD
0210 nano-technology
Constant (mathematics)
MAGNETIC SUSCEPTIBILITY
INTELLIGENT SYSTEMS
Magnetic dipole–dipole interaction
Zdroj: Phys. Rev. E
Physical Review E
Solovyova, A Y, Elfimova, E A, Ivanov, A O & Camp, P J 2017, ' Modified mean-field theory of the magnetic properties of concentrated, high-susceptibility, polydisperse ferrofluids ', Physical Review E, vol. 96, no. 5 . https://doi.org/10.1103/PhysRevE.96.052609
ISSN: 1063-651X
DOI: 10.1103/PhysRevE.96.052609
Popis: The effects of particle-size polydispersity on the magnetostatic properties of concentrated ferrofluids are studied using theory and computer simulation. The second-order modified mean-field (MMF2) theory of Ivanov and Kuznetsova [Phys. Rev. E 64, 041405 (2001)1063-651X10.1103/PhysRevE.64.041405] has been extended by calculating additional terms of higher order in the dipolar coupling constant in the expansions of the initial magnetic susceptibility and the magnetization curve. The theoretical predictions have been tested rigorously against results from Monte Carlo simulations of model monodisperse, bidisperse, and highly polydisperse ferrofluids. Comparisons have been made between systems with the same Langevin susceptibility and the same saturation magnetization. In all cases, the new theoretical magnetization curve shows better agreement with simulation data than does the MMF2 theory. As for the initial susceptibility, MMF2 theory is most accurate for the monodisperse model, while the new theory works best for polydisperse systems with a significant proportion of large particles. These results are important for the analysis and characterization of recently synthesized polydisperse ferrofluids with record-breaking values of the initial magnetic susceptibility. © 2017 American Physical Society.
Databáze: OpenAIRE
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