Coiling of semiflexible paramagnetic colloidal chains

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dc.citation.firstpage2385
dc.citation.journalTitleSoft Matter
dc.citation.lastpage2396
dc.citation.volumeNumber19
dc.contributor.authorSpatafora-Salazar, Aldo
dc.contributor.authorKuei, Steve
dc.contributor.authorCunha, Lucas H.P.
dc.contributor.authorBiswal, Sibani Lisa
dc.date.accessioned2023-05-04T15:04:29Z
dc.date.available2023-05-04T15:04:29Z
dc.date.issued2023
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.
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.
dc.identifier.doihttps://doi.org/10.1039/D3SM00066D
dc.identifier.urihttps://hdl.handle.net/1911/114873
dc.language.isoeng
dc.publisherRoyal Society of Chemistry
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.
dc.titleCoiling of semiflexible paramagnetic colloidal chains
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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