Molecular dynamics simulations of microscopic structural transition and 
macroscopic mechanical properties of magnetic gels

Wei, Xuefeng; Junot, Gaspard; Golestanian, Ramin; Zhou, Xin; Wang, Yanting; Tierno, Pietro; Meng, Fanlong

doi:10.1063/5.0210769

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Molecular dynamics simulations of microscopic structural transition and macroscopic mechanical properties of magnetic gels

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Golestanian, Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Wei, X., Junot, G., Golestanian, R., Zhou, X., Wang, Y., Tierno, P., et al. (2024). Molecular dynamics simulations of microscopic structural transition and macroscopic mechanical properties of magnetic gels. The Journal of Chemical Physics, 161: 074902. doi:10.1063/5.0210769.

Cite as: https://hdl.handle.net/21.11116/0000-000F-BEF6-6

Abstract

Magnetic gels with embedded micro-/nano-sized magnetic particles in cross-linked polymer networks can be actuated by external
magnetic fields, with changes in their internal microscopic structures and macroscopic mechanical properties. We investigate the
responses of such magnetic gels to an external magnetic field, by means of coarse-grained molecular dynamics simulations. We find
that the dynamics of magnetic particles are determined by the interplay of magnetic dipole–dipole interactions, polymer elasticity,
and thermal fluctuations. The corresponding microscopic structures formed by the magnetic particles, such as elongated chains, can
be controlled by the external magnetic field. Furthermore, the magnetic gels can exhibit reinforced macroscopic mechanical proper-
ties, where the elastic modulus increases algebraically with the magnetic moments of the particles in the form of ∝ (m − mc)2 when
magnetic chains are formed. This simulation work can not only serve as a tool for studying the microscopic and the macroscopic
responses of the magnetic gels, but also facilitate future fabrications and practical controls of magnetic composites with desired physical
properties.