Tunable dynamic response of magnetic gels: Impact of structural properties and magnetic fields

Tarama, Mitsusuke; Cremer, Peet; Borin, Dmitry; Odenbach, Stefan; Löwen, Hartmut; Menzel, Andreas M.

doi:10.1103/physreve.90.042311

Cited by 43 publications

(46 citation statements)

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“…Influence of structural parameters, such as the volume fraction of the magnetic particles and the degree of cross-linking of an elastomeric matrix, on the dynamic mechanical behaviour of MSEs under magnetic field has been discussed in a number of experimental works. 34 However, the dynamic moduli were not considered in the literature using microscopic models. The frequency dependences of the storage and loss moduli of MSEs have been analysed using some phenomenological approaches.…”

Section: Introductionmentioning

confidence: 99%

Dynamic moduli of magneto-sensitive elastomers: a coarse-grained network model

2015

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The viscoelastic properties of magneto-sensitive elastomers (MSEs) in a low-frequency regime are studied using a coarse-grained network model. The proposed model takes into account the mechanical coupling between magnetic particles included in a whole network structure and magnetic interactions between them. We show that the application of a constant uniform magnetic field leads to the splitting of the relaxation spectrum into two branches for the motions of the particles parallel and perpendicular to the field. The shear dynamic moduli G' and G'' of MSEs are calculated as a function of frequency. The values of G' and G'' are shown to depend on the direction of the shear deformation with respect to the magnetic field. For instance, both G' and G'' decrease if the magnetic field is applied parallel to the shear velocity (D-geometry) and increase if it is applied along the shear gradient (G-geometry). The latter prediction is in a qualitative agreement with existing experimental data. The theory allows us to analyse experimental data and to extract the structural characteristics of MSEs.

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Section: Introductionmentioning

confidence: 99%

Dynamic moduli of magneto-sensitive elastomers: a coarse-grained network model

2015

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“…For the modelling of the non-magnetic interactions in our system of SMPs, we choose a coarse-grained approach based on a bead-spring representation, as is frequent in simulations of polymer-magnetic colloidal particle composites [41][42][43][44][45][46]. Specifically, the magnetic colloids are modelled as soft spheres of characteristic diameter σ , interacting with a Weeks-Chandler-Andersen (WCA) pair potential [47] …”

Section: A Model Of Stabilised Polymer-like Aggregates Of Magnetic Comentioning

confidence: 99%

Self-assembly of polymer-like structures of magnetic colloids: Langevin dynamics study of basic topologies

Rozhkov

Pyanzina

Novak

et al. 2017

Molecular Simulation

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We study the self-assembly of colloidal magnetic particles permanently cross-linked into polymer-like structures with different topologies, that we call supracolloidal magnetic polymers (SMPs). In order to understand the influence of the interparticle permanent links, we investigate SMPs holding the main topologies observed in the self-assembly of non-cross-linked magnetic particles via grand canonical Monte Carlo simulations: chains, rings and simple branched structures. Here, using molecular dynamics simulations, we focus on systems of SMP pairs. Our results evidence that the presence of crosslinkers leads to the formation of new types of aggregates, not previously observed for individual magnetic colloids. ARTICLE HISTORY

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“…However, the nature of the mechanical response and other characteristic material properties can strongly depend on the spatial distribution of the magnetic particles within the sample. 1,31,[44][45][46][47][48][49][50][51] Typical particle diameters range from nano-to micrometers and thus involve an intermediate, i.e., mesoscopic length scale. Finally, for rubbery substances, the fact that the materials are elastic mainly results from the entropic properties of the single crosslinked polymer chains and is therefore of molecular microscopic origin.…”

Section: Introductionmentioning

confidence: 99%

Bridging from particle to macroscopic scales in uniaxial magnetic gels

Menzel

2014

The Journal of Chemical Physics

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Connecting the different length scales of characterization is an important, but often very tedious task for soft matter systems. Here, we carry out such a procedure for the theoretical description of anisotropic uniaxial magnetic gels. The so-far undetermined material parameters in a symmetry-based macroscopic hydrodynamic-like description are determined starting from a simplified mesoscopic particle-resolved model. This mesoscopic approach considers chain-like aggregates of magnetic particles embedded in an elastic matrix. Our procedure provides an illustrative background to the formal symmetry-based macroscopic description. There are presently other activities to connect such mesoscopic models as ours with more microscopic polymer-resolved approaches; together with these activities, our study complements a first attempt of scale-bridging from the microscopic to the macroscopic level in the characterization of magnetic gels.

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Tunable dynamic response of magnetic gels: Impact of structural properties and magnetic fields

Cited by 43 publications

References 43 publications

Dynamic moduli of magneto-sensitive elastomers: a coarse-grained network model

Dynamic moduli of magneto-sensitive elastomers: a coarse-grained network model

Self-assembly of polymer-like structures of magnetic colloids: Langevin dynamics study of basic topologies

Bridging from particle to macroscopic scales in uniaxial magnetic gels

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