Structural changes in microferrogels cross-linked by magnetically anisotropic particles

Ryzhkov, A. V.; Raǐkher, Yu. L.

doi:10.1016/j.jmmm.2016.09.056

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…Coarse-grained molecular dynamics [ 28 , 29 , 30 , 31 ], the ‘virtual spring’ method [ 26 , 27 ], and the Verlet algorithm [ 32 ] were used to minimize function

, thus obtaining the equilibrium state of the sample under a given combination of electric and magnetic fields. By that, one is able to consider the system response under cyclic (but quasistatic) changes of both applied fields.…”

Section: Methodsmentioning

confidence: 99%

“…Since the composites such as MAEs do not need to be detailed at the real molecular level, a model approach that is successfully applied to simulate such systems is the coarse-grained molecular dynamics [ 26 , 27 ]. In this framework, the interparticle magnetic dipole–dipole interaction is taken in the classical approximation assuming each dipole moment to be pointwise and located in the center of the particle.…”

Section: Introductionmentioning

confidence: 99%

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Multiferroic Coupling of Ferromagnetic and Ferroelectric Particles through Elastic Polymers

et al. 2021

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Multiferroics are materials that electrically polarize when subjected to a magnetic field and magnetize under the action of an electric field. In composites, the multiferroic effect is achieved by mixing of ferromagnetic (FM) and ferroelectric (FE) particles. The FM particles are prone to magnetostriction (field-induced deformation), whereas the FE particles display piezoelectricity (electrically polarize under mechanical stress). In solid composites, where the FM and FE grains are in tight contact, the combination of these effects directly leads to multiferroic behavior. In the present work, we considered the FM/FE composites with soft polymer bases, where the particles of alternative kinds are remote from one another. In these systems, the multiferroic coupling is different and more complicated in comparison with the solid ones as it is essentially mediated by an electromagnetically neutral matrix. When either of the fields, magnetic or electric, acts on the ‘akin’ particles (FM or FE) it causes their displacement and by that perturbs the particle elastic environments. The induced mechanical stresses spread over the matrix and inevitably affect the particles of an alternative kind. Therefore, magnetization causes an electric response (due to the piezoeffect in FE) whereas electric polarization might entail a magnetic response (due to the magnetostriction effect in FM). A numerical model accounting for the multiferroic behavior of a polymer composite of the above-described type is proposed and confirmed experimentally on a polymer-based dispersion of iron and lead zirconate micron-size particles.

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“…Coarse-grained molecular dynamics [ 28 , 29 , 30 , 31 ], the ‘virtual spring’ method [ 26 , 27 ], and the Verlet algorithm [ 32 ] were used to minimize function

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiferroic Coupling of Ferromagnetic and Ferroelectric Particles through Elastic Polymers

et al. 2021

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“…Considerable simplifications at the microscopic level should be chosen very carefully in or-der to attain a proper representation of the experimental system. Computer simulation models usually represent the embedded magnetic particles as beads with point magnetic dipoles, whereas particle-particle and particlepolymer matrix interactions are modeled with different levels of detail [38][39][40][41][42][43]. Obviously, the more naturally the microscopic details are presented in a simulation model, the more expensive becomes the cost of computations.…”

Section: Introductionmentioning

confidence: 99%

Interparticle Correlations in the Simple Cubic Lattice of Ferroparticles: Theory and Computer Simulations

Solovyova,

Kuznetsov,

Elfimova

2020

Preprint

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Anisotropic interparticle correlations in the simple cubic lattice of single-domain ferroparticles (SCLF) are studied using both theory and computer simulation. The theory is based on the Helmholtz free energy expansion like classical virial series up to the second virial coefficient. The analytical formula for the Helmholtz free energy is incorporated in a logarithmic form to minimize the effects of series truncation. The new theoretical approach, including discrete summation over lattice nodes coordinates, is compared critically against the classical virial expansion of the Helmholtz free energy for the dipolar hard sphere fluid; the main differences between the Helmholtz free energy of SCLF and dipolar hard sphere fluid are discussed. The theoretical results for the Helmholtz free energy, the magnetization, and the initial magnetic susceptibility of the SCLF are compared against Molecular Dynamic simulation data. In all cases, theoretical predictions using logarithmic form of the Helmholtz free energy are seen to be superior, but they only have an applicability range of the effective dipolar coupling constant λe < 1.5. For highest values of λe, the structural transition of the magnetic dipoles in SCLF is observed in Molecular Dynamic simulation. It has been shown that for λe 2, an antiferromagnetic order appears in the system.

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“…[7,8], structure (i.e., chain formation), magnetisation and volume changes due to application of an external uniform magnetic field depend on the type of uniaxial magnetic anisotropy of NPs. However, the above-cited works were focused exclusively on highly-filled samples with strong dipolar magnetic interaction between NPs.…”

Section: Introductionmentioning

confidence: 99%

The effect of magnetic nanoparticle concentration on the structure organisation of a microferrogel

Ryzhkov

Melenev

Bǎlǎșoiu

et al. 2018

J. Phys.: Conf. Ser.

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The effect of magnetic nanoparticle concentration on the structure organisation of a microferrogel Abstract. Coarse-grained molecular dynamics simulation is applied to study the structural response of micro-sized magnetopolymer objects -microferrogels (MFG). The results for MFGs with different magnetic properties and concentrations of magnetic filler nanoparticles are analysed to detect the transition between non-aggregated configurations and the states with pronounced chains. The nanoparticles are assumed to be either magnetically isotropic or to possess infinite magnetic anisotropy. It is shown that, depending on the type of the particle anisotropy, an applied field in rather different ways affects the MFG structure and shape. Diagrams describing the degree of aggregation as a function of the parameter of the interparticle magnetodipolar interaction and concentration are presented. In particular, it is found that in the case of infinitely anisotropic nanoparticles the aggregation transitions undergoes via a nontrivial scenario. The effect of the structure transformations on the volume change of the MFG objects is studied as well.

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Structural changes in microferrogels cross-linked by magnetically anisotropic particles

Cited by 10 publications

References 16 publications

Multiferroic Coupling of Ferromagnetic and Ferroelectric Particles through Elastic Polymers

Multiferroic Coupling of Ferromagnetic and Ferroelectric Particles through Elastic Polymers

Interparticle Correlations in the Simple Cubic Lattice of Ferroparticles: Theory and Computer Simulations

The effect of magnetic nanoparticle concentration on the structure organisation of a microferrogel

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