Magnetic particle nanorheology

Roeben, Eric; Roeder, Lisa; Teusch, Sandra; Effertz, Marc; Deiters, Ulrich K.; Schmidt, Annette

doi:10.1007/s00396-014-3289-6

Cited by 60 publications

(76 citation statements)

References 35 publications

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“…In a recent study, Ilg et al [49] have proposed a mesoscopic model to investigate the dynamics of (individual) MNPs in a viscoelastic medium, focusing on magnetic relaxation phenomena. The findings were found to be consistent with nanorheological experiments [50]. Still, it is clear that more particle-based investigations are needed to elucidate the behavior of magnetic hybrid systems with complex matrices under shear, especially at larger dipolar coupling strengths.…”

Section: Introductionsupporting

confidence: 81%

Steady-state rheology and structure of soft hybrid mixtures of liquid crystals and magnetic nanoparticles

2020

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Using non-equilibrium molecular dynamics simulations, we study the rheology of a model hybrid mixture of liquid crystals (LCs) and dipolar soft spheres (DSS) representing magnetic nanoparticles. The bulk isotropic LC-DSS mixture is sheared with different shear rates using Lees-Edwards periodic boundary conditions. The steady-state rheological properties and the effect of the shear on the microstructure of the mixture are studied for different strengths of the dipolar coupling, λ, among the DSS. We find that at large shear rates, the mixture shows a shear-thinning behavior for all considered values of λ. At low and intermediate values of λ, a crossover from Newtonian to non-Newtonian behavior is observed as the rate of applied shear is increased. In contrast, for large values of λ, such a crossover is not observed within the range of shear rates considered. Also, the extent of the non-Newtonian regime increases as λ is increased. These features can be understood via the shear-induced changes of the microstructure. In particular, the LCs display a shear-induced isotropic-to-nematic transition at large shear rates with a shear-rate dependent degree of nematic ordering. The DSS show a shear-induced nematic ordering only for large values of λ, where the particles self-assemble into chains. Moreover, at large λ and low shear rates, our simulations indicate that the DSS form ferromagnetic domains. arXiv:1910.08342v1 [cond-mat.soft]

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Section: Introductionsupporting

confidence: 81%

Steady-state rheology and structure of soft hybrid mixtures of liquid crystals and magnetic nanoparticles

2020

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“…We have also used this technique to monitor phase transitions in the surrounding media, colloidal stability of MNPs in simple fluids, and adsorption of proteins to MNPs [47][48][49]. Others have also applied this technique to evaluate the mobility of nanoparticles in polymer hydrogels [50] and to evaluate the rheological properties of the suspending fluid [51]. Here we show that dynamic magnetic susceptibility measurements can be used to evaluate the presence of MNP aggregates in polymer matrices.…”

Section: Introductionmentioning

confidence: 92%

Assessing magnetic nanoparticle aggregation in polymer melts by dynamic magnetic susceptibility measurements

Sierra-Bermúdez

Maldonado-Camargo

Orange

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…[1][2][3][4][5][6][7] Magnetic nanoparticulate probes have recently been proven useful in supplying information on the specific particle environment using quasi-static [8][9][10] or dynamic [11][12][13] magnetic methods. [1][2][3][4][5][6][7] Magnetic nanoparticulate probes have recently been proven useful in supplying information on the specific particle environment using quasi-static [8][9][10] or dynamic [11][12][13] magnetic methods.…”

Section: Introductionmentioning

confidence: 99%

“…With respect to the deflection of this magnetic moment out of plane, hematite can be considered as a hard magnetic material, as has been demonstrated by many experimental studies and calculations. 1,13,[26][27][28][29][30][31] Building on our previous work on particle-crosslinked ferrohydrogels based on spherical CoFe 2 O 4 particles in a poly(acrylamide) (PAAm) matrix, 8,32 spindle-like hematite particles are used as exclusive crosslinkers in PAAm gels. Thus they possess a magnetic moment perpendicular to their long axis.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels

Roeder

Bender

Kundt

et al. 2015

Phys. Chem. Chem. Phys.

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Particle-crosslinked polymer composites and gels have recently been shown to possess novel or improved properties due to a covalent particle-matrix interaction. We employ spindle-like hematite particles as exclusive crosslinkers in poly(acrylamide) gels, and exploit their extraordinary magnetic properties for the realization of ferrohydrogels with a perpendicular orientation of the preferred magnetic and geometric axes of the particles. The angle-dependent magnetic properties of uniaxially oriented gels are investigated and interpreted with respect to particle-matrix interactions. The impact of the particle orientation on the resulting angle-dependent magnetic performance reveals the presence of two different contributions to the magnetization: a hysteretic component ascribed to immobilized particles, and a pseudo-superparamagnetic, non-hysteretic component due to residual particle mobility. Furthermore, a plastic reorientation of magnetic particles in the matrix when subjected to a transversal field component is observed.

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Magnetic particle nanorheology

Cited by 60 publications

References 35 publications

Steady-state rheology and structure of soft hybrid mixtures of liquid crystals and magnetic nanoparticles

Steady-state rheology and structure of soft hybrid mixtures of liquid crystals and magnetic nanoparticles

Assessing magnetic nanoparticle aggregation in polymer melts by dynamic magnetic susceptibility measurements

Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels

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