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Magnetically Actuated Surface Microstructures for Efficient Transport and Tunable Separation of Droplets and Solids

  • Efficient transportation of droplets (∽10 ¹ ̶̶̶̶ 10 ² µl) and small solid objects (∽10 ¹ ̶ 10 ² mm ³ ) have important applications in many fields, such as microfluidics, lab‐on‐a‐chip devices, drug delivery, etc. A novel multifunctional surface consisting of a periodic array of micro‐lamellae from a soft magnetoactive elastomer (MAE) on a plastic substrate is reported for these purposes. The physical origin of the propulsion is the bending of soft magnetic lamellae in non‐uniform magnetic fields, which is also observed in uniform magnetic fields. The magnetoactive surface is fabricated using a facile and rapid method of laser ablation. The propulsion of items is realized using a four‐pole rotating magnet. This results in a cyclic lamellar fringe motion over the micro‐structured surface and brings an advantage of easy reciprocation of transport by rotation reversal. Two modes of object transportation are identified: “pushing” mode for precise control of droplet and solid positioning and “bouncing” mode for heavier solid objects transportation. A water droplet of 5 μl or a glass sphere with a 2.1 mm diameter can be moved at a maximum speed of 60 mm s ⁻¹ . The multifunctionality of the proposed mechatronic platform is demonstrated on the examples of selective solid‐liquid separation and droplet merging.

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Metadaten
Author:Gaia Kravanja, Raphael Kriegl, Luka Hribar, Gašper Glavan, Irena Drevenšek-Olenik, Mikhail Shamonin (Chamonine)ORCiDGND, Matija Jezeršek
DOI:https://doi.org/10.1002/adem.202301000
ISSN:1527-2648
Parent Title (English):Advanced Engineering Materials
Publisher:Wiley-VCH
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2023/10/17
Tag:Keywordslaser micromachinings; magnetoactive elastomers; magnetoresponsivesurfaces; object separations; object transportations
Volume:25
Issue:22
Article Number:2301000
First Page:1
Last Page:11
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme
OpenAccess Publikationsweg:Hybrid Open Access - OA-Veröffentlichung in einer Subskriptionszeitschrift/-medium
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG