Aligned colloidal clusters in an alternating rotating magnetic field elucidated by magnetic relaxation

Simple item page
dc.citation.articleNumbere2404145121en_US
dc.citation.issueNumber41en_US
dc.citation.journalTitleProceedings of the National Academy of Sciencesen_US
dc.citation.volumeNumber121en_US
dc.contributor.authorSpatafora-Salazar, Aldoen_US
dc.contributor.authorLobmeyer, Dana M.en_US
dc.contributor.authorCunha, Lucas H. P.en_US
dc.contributor.authorJoshi, Kedaren_US
dc.contributor.authorBiswal, Sibani Lisaen_US
dc.date.accessioned2024-10-29T14:11:23Zen_US
dc.date.available2024-10-29T14:11:23Zen_US
dc.date.issued2024en_US
dc.description.abstractPrecise control at the colloidal scale is one of the most promising bottom–up approaches to fabricating new materials and devices with tunable and precisely engineered properties. Magnetically driven colloidal assembly offers great versatility because of the ability to externally tune particle–particle interactions and to construct a host of particle arrangements. However, despite previous efforts to probe the parameter space, global orientational control in conjunction with two-dimensional microstructural control has remained out of reach. Furthermore, the magnetic relaxation time of superparamagnetic beads has been largely overlooked despite being a key feature of the magnetic response. Here, we take advantage of the magnetic relaxation time of superparamagnetic beads in an alternating rotating magnetic field and show how harnessing this feature facilitates the formation of oriented clusters. The orientation of these clusters can be controlled by field parameters. Using experiments, simulations, and theory, we probe a two-particle system (dimer) under this alternating rotating magnetic field and use its dynamics to provide insights into the collective response that forms clusters. We find that the type of field has significant implications for the dipolar interactions between the colloids because of the nonnegligible magnetic relaxation. Moreover, we find that the competing time scales of the magnetic relaxation and the alternating field generate an anisotropic interaction potential that drives cluster alignment. By exploiting the magnetic relaxation time of magnetic systems, we can tailor new types of interparticle interactions, thereby expanding the capabilities of colloidal assembly in engineering unique materials and devices.en_US
dc.identifier.citationSpatafora-Salazar, A., Lobmeyer, D. M., Cunha, L. H. P., Joshi, K., & Biswal, S. L. (2024). Aligned colloidal clusters in an alternating rotating magnetic field elucidated by magnetic relaxation. Proceedings of the National Academy of Sciences, 121(41), e2404145121. https://doi.org/10.1073/pnas.2404145121en_US
dc.identifier.digitalspatafora-salazar-et-al-2024en_US
dc.identifier.doihttps://doi.org/10.1073/pnas.2404145121en_US
dc.identifier.urihttps://hdl.handle.net/1911/117969en_US
dc.language.isoengen_US
dc.publisherNational Academy of Sciencesen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titleAligned colloidal clusters in an alternating rotating magnetic field elucidated by magnetic relaxationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
spatafora-salazar-et-al-2024.pdf
Size:
12.22 MB
Format:
Adobe Portable Document Format
Download
Collections
Faculty Publications
Chemical and Biomolecular Engineering Publications