Coiling of semiflexible paramagnetic colloidal chains

dc.citation.firstpage2385en_US
dc.citation.journalTitleSoft Matteren_US
dc.citation.lastpage2396en_US
dc.citation.volumeNumber19en_US
dc.contributor.authorSpatafora-Salazar, Aldoen_US
dc.contributor.authorKuei, Steveen_US
dc.contributor.authorCunha, Lucas H.P.en_US
dc.contributor.authorBiswal, Sibani Lisaen_US
dc.date.accessioned2023-05-04T15:04:29Zen_US
dc.date.available2023-05-04T15:04:29Zen_US
dc.date.issued2023en_US
dc.description.abstractSemiflexible filaments deform into a variety of configurations that dictate different phenomena manifesting at low Reynolds number. Harnessing the elasticity of these filaments to perform transport-related processes at the microfluidic scale requires structures that can be directly manipulated to attain controllable geometric features during their deformation. The configuration of semiflexible chains assembled from paramagnetic colloids can be readily controlled upon the application of external time-varying magnetic fields. In circularly rotating magnetic fields, these chains undergo coiling dynamics in which their ends close into loops that wrap inward, analogous to the curling of long nylon filaments under shear. The coiling is promising for the precise loading and targeted transport of small materials, however effective implementation requires an understanding of the role that field parameters and chain properties play on the coiling features. Here, we investigate the formation of coils in semiflexible paramagnetic chains using numerical simulations. We demonstrate that the size and shape of the initial coils are governed by the Mason and elastoviscous numbers, related to the field parameters and the chain bending stiffness. The size of the initial coil follows a nonmonotonic behavior with Mason number from which two regions are identified: (1) an elasticity-dependent nonlinear regime in which the coil size decreases with increasing field strength and for which loop shape tends to be circular, and (2) an elasticity-independent linear regime where the size increases with field strength and the shape become more elliptical. From the time scales associated to these regimes, we identify distinct coiling mechanisms for each case that relate the coiling dynamics to two other configurational dynamics of paramagnetic chains: wagging and folding behaviors.en_US
dc.identifier.citationSpatafora-Salazar, Aldo, Kuei, Steve, Cunha, Lucas H.P., et al.. "Coiling of semiflexible paramagnetic colloidal chains." <i>Soft Matter,</i> 19, (2023) Royal Society of Chemistry: 2385-2396. https://doi.org/10.1039/D3SM00066D.en_US
dc.identifier.doihttps://doi.org/10.1039/D3SM00066Den_US
dc.identifier.urihttps://hdl.handle.net/1911/114873en_US
dc.language.isoengen_US
dc.publisherRoyal Society of Chemistryen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the Royal Society of Chemistry.en_US
dc.titleCoiling of semiflexible paramagnetic colloidal chainsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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