Relating the length of a magnetic filament with solvophobic, superparamagnetic colloids to its properties in applied magnetic fields

Author(s): Deniz Mostarac, Ekaterina V. Novak, Sofia S. Kantorovich
Abstract: The idea of creating polymer-like structures by crosslinking magnetic nanoparticles (MNPs) opened an alternative perspective on controlling the rheological properties of magnetoresponsive systems, because unlike suspensions of self-assembled MNPs, whose cluster sizes are sensitive to temperature, magnetic filaments (MFs) preserve their initial topology. Considering the length scales characteristic of single-domain nanoparticles used to create MFs, the MNPs can be both ferro- and superparamagnetic. Moreover, steric or electrostatic stabilization might not fully screen van der Waals interactions. In this paper, using coarse-grained molecular dynamics simulations, we investigate the influence of susceptibility of superparamagnetic MNPs - their number and central attraction forces between them - on the polymeric, structural, and magnetic properties of MFs with varied backbone rigidity. We find that, due to the general tendency of MFs with superparamagnetic monomers to bend, reinforced for colloids with a high susceptibility, properties of MFs vary greatly with chain length.
Organisation(s): Computational and Soft Matter Physics, Research Platform MMM Mathematics-Magnetism-Materials
External organisation(s): Ural Federal University
Journal: Physical Review E
Volume: 108
No. of pages: 12
ISSN: 2470-0045
DOI: https://doi.org/10.1103/PhysRevE.108.054601
Publication date: 11-2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 103015 Condensed matter
ASJC Scopus subject areas: Statistical and Nonlinear Physics, Statistics and Probability, Condensed Matter Physics
Portal url: https://ucris.univie.ac.at/portal/en/publications/relating-the-length-of-a-magnetic-filament-with-solvophobic-superparamagnetic-colloids-to-its-properties-in-applied-magnetic-fields(fa75506d-d089-46bd-b9d1-14a781a53317).html