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Issue 1, 2021
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Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study

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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 between the magnetic properties of the particles and the mechanical properties of the (visco)elastic polymer matrix remain unresolved. Here we study the response of a single-domain spherical magnetic nanoparticle that is suspended in a polymer solution to alternating magnetic fields. As interactions we consider only excluded volume interactions with the polymers and hydrodynamic interactions mediated through the solvent. The AC susceptibility spectra are calculated using a linear response Green–Kubo approach, and the influences of changing polymer concentration and polymer length are investigated. Our data is compared to recent measurements of the AC susceptibility for a typical magnetic composite system [Roeben et al., Colloid Polym. Sci., 2014, 2013–2023], and demonstrates the importance of hydrodynamic coupling in such systems.

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

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Article information


Submitted
28 Aug 2020
Accepted
28 Oct 2020
First published
28 Oct 2020

Soft Matter, 2021,17, 174-183
Article type
Paper

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

P. Kreissl, C. Holm and R. Weeber, Soft Matter, 2021, 17, 174
DOI: 10.1039/D0SM01554G

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