Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study

Kreissl, Patrick; Holm, Christian; Weeber, Rudolf

doi:10.1039/d0sm01554g

Cited by 21 publications

(16 citation statements)

References 66 publications

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“…Hydrodynamic coupling alone, between the MNPs' rotational relaxation behaviour and polymeric environment, produces shifts in the AC susceptibility spectra -towards lower frequencies with increasing polymer concentration and chain length, respectively. 29 These shifts had previously been observed in experiments. 14 MNPs are not necessarily spherical.…”

Section: Introductionsupporting

confidence: 61%

Interplay between steric and hydrodynamic interactions for ellipsoidal magnetic nanoparticles in a polymer suspension

2023

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Section: Introductionsupporting

confidence: 61%

Interplay between steric and hydrodynamic interactions for ellipsoidal magnetic nanoparticles in a polymer suspension

2023

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“…To realize such settings magnetic systems represent natural candidates. Similar situations have been addressed in several experimental, theoretical, and simulation studies in the field of magnetic microrheology [14][15][16]28]. There, information on the dynamics of the viscoelastic medium is extracted from the configurational response of embedded magnetic particles to timedependent external magnetic fields.…”

Section: Magnetically Induced Particle Reorientationsmentioning

confidence: 82%

“…Therefore, m(t) = m m(t), where m(t) is rigidly and permanently anchored to the particle frame. Consequently, changes in magnetic properties only result from particle reorientations [28,29].…”

Section: Magnetically Induced Particle Reorientationsmentioning

confidence: 99%

Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

Richter,

Deters,

Menzel

2021

Preprint

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Using analytical calculations, we characterize the rotational behavior of a rigid spherical particle when subject to a net external torque in a continuous viscoelastic environment. On long time scales, the embedding medium can either feature a net terminal flow, like a fluid, or damped reversible dynamics, like an elastic solid. The coupling of the sphere to its environment together with the therein induced deformations and flows are taken into account explicitly. In reality, using magnetically anisotropic particles, the torque can, for instance, be applied via magnetic fields. We calculate corresponding response functions. This connects our study to evaluations of microrheological investigations.

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“…The HI are included by coupling the particle's velocity to a lattice Boltzmann fluid. We employ the raspberry particle model [34][35][36] shown in Fig. 1b.…”

Section: A Raspberry Colloidal Particle Diffusionmentioning

confidence: 99%

An empirical method to characterize displacement distribution functions for anomalous and transient diffusion

Qiao,

Ilow,

Ignacio

et al. 2022

Preprint

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We propose a practical empirical fitting function to characterize the non-Gaussian displacement distribution functions (DispD) often observed for heterogeneous diffusion problems. We first test this fitting function with the problem of a colloidal particle diffusing between two walls using Langevin Dynamics (LD) simulations of a raspberry particle coupled to a lattice Boltzmann (LB) fluid. We also test the function with a simple model of anomalous diffusion on a square lattice with obstacles. In both cases, the fitting parameters provide more physical information than just the Kurtosis (which is often the method used to quantify the degree of anomaly of the dynamics), including a length scale that marks where the tails of the DispD begin. In all cases, the fitting parameters smoothly converge to Gaussian values as the systems become less anomalous.

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Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study

Abstract: Magnetic composite materials i.e. elastomers, polymer gels, or polymer solutions with embedded magnetic nanoparticles are useful for many technical and bio-medical applications. However, the microscopic details of the coupling mechanisms...

Cited by 21 publications

References 66 publications

Interplay between steric and hydrodynamic interactions for ellipsoidal magnetic nanoparticles in a polymer suspension

Interplay between steric and hydrodynamic interactions for ellipsoidal magnetic nanoparticles in a polymer suspension

Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

An empirical method to characterize displacement distribution functions for anomalous and transient diffusion

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