The impact of magnetic field on the conformations of supracolloidal polymer-like structures with super-paramagnetic monomers

Autor(en)

D. Mostarac, E.V. Novak, P.A. Sánchez, S.S. Kantorovich

Abstrakt

We investigate the properties of magnetic supracolliodal polymers – magnetic filaments (MFs) – with super-paramagnetic monomers, with and without Van der Waals (VdW) attraction between them. We employ molecular dynamics (MD) simulations to elucidate the impact of crosslinking mechanism on the structural and magnetic response of MFs to an applied external homogeneous magnetic field. We consider two models: plain crosslinking, which results in a flexible backbone; and constrained crosslinking, which provides significant stiffens against bending. We find that for plain crosslinking, even a slight increase of the central attraction leads to collapsed MF conformations. Structures that initially exhibit spherical symmetry evolve into cylindrically symmetric ones, with growing magnetic field strength. Plain crosslinking also allows for conformational bistability. MFs with constrained crosslinking tend to, instead, unravel in field. In both crosslinking scenarios, central attraction is able to hinder low-field magnetic response of MFs, albeit the bistability of plainly crosslinked MFs manifests itself also in the high-field region.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Ural Federal University, Wolfgang Pauli Institute (WPI) Vienna

Journal

Journal of Molecular Liquids

Band

305

Anzahl der Seiten

8

ISSN

0167-7322

DOI

https://doi.org/10.1016/j.molliq.2020.112761

Publikationsdatum

05-2020

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103017 Magnetismus, 103029 Statistische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Materials Chemistry, Atomic and Molecular Physics, and Optics, Spectroscopy, Physical and Theoretical Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f07a8f85-a7ce-4344-ac0f-96955adb0040