Capturing the slow relaxation time of superparamagnetic colloids in time-varying fields
Soft Condensed Matter
2024-02-13 v1
Abstract
Superparamagnetic colloids present interesting assembly dynamics and propulsion in time-varying magnetic fields due to their magnetic relaxation. However, little is known about the mechanisms governing this magnetic relaxation, which is commonly attributed to the interactions and polydispersity of the ferromagnetic nanoparticles distributed within the colloid. We measure this relaxation from the effective potential between colloids subjected to rotating magnetic fields. Remarkably, our results indicate the presence of magnetic relaxation times much longer than what has been reported, which furthers our understanding of the magnetization of colloids in complex magnetic fields.
Cite
@article{arxiv.2402.06802,
title = {Capturing the slow relaxation time of superparamagnetic colloids in time-varying fields},
author = {Lucas H. P. Cunha and Aldo Spatafora-Salazar and Dana M. Lobmeyer and Kedar Joshi and Fred C. MacKintosh and Sibani Lisa Biswal},
journal= {arXiv preprint arXiv:2402.06802},
year = {2024}
}
Comments
6 pages, 4 figures