Metadata only
Datum
2020-10-01Typ
- Journal Article
Abstract
Magnetic actuation offers a means to wirelessly control flow in ferrofluids for applications including microfluidic pumping and targeted drug delivery. Despite the promise of these concepts, practical use of synthetic ferrofluids as actuators of flow frequently requires high concentrations and is hindered by low ferrohydrodynamic coupling efficiency and inhomogeneous flow fields. Inspired by the magnetic properties and hydrodynamic forms displayed by magnetotactic bacteria (MTB), this work studies the use of these microbes as a living, self‐replicating ferrofluid for improved fluidic transport via magnetically coerced rotation. Using multicore iron oxide nanoparticles as a performance benchmark, MTB under rotating magnetic fields are shown to produce more homogeneous and efficient flow. Coupling is enhanced whether the comparison is made in terms of volume of magnetic material or total volume fraction. To clarify the mechanistic role of interactions with boundaries in transport, a computational model is developed and validated experimentally. Applying this model, two distinct and feasible magnetic control strategies are predicted: a rotating gradient field that generates directional flow despite boundaries that promote flow in opposing directions and a magnetostatic gating field that enables spatially selective actuation. The advantageous properties identified for MTB open a design space for these strategies to be realized. Mehr anzeigen
Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Advanced Functional MaterialsBand
Seiten / Artikelnummer
Verlag
WileyThema
Ferrohydrodynamic flow; Flow mediator; Magnetotactic bacteria; Microfluidic pumping; Selective drug deliveryOrganisationseinheit
09619 - Schürle-Finke, Simone / Schürle-Finke, Simone
Zugehörige Publikationen und Daten
Is supplement to: https://doi.org/10.3929/ethz-b-000585789
Is supplemented by: http://hdl.handle.net/20.500.11850/527784