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Control of Droplet Impact through Magnetic Actuation of Surface Microstructures

  • An effective method for on-demand control over the impact dynamics of droplets on a magnetoresponsive surface is reported. The surface is comprised of micrometer-sized lamellas from a magnetoactive elastomer on a copper substrate. The surface itself is fabricated using laser micromachining. The orientation of the lamellae is switched from edge-on (orthogonal to the surface) to face-on (parallel to the surface) by changing the direction of a moderate (<250 mT) magnetic field. This simple actuation technique can significantly change the critical velocities of droplet rebound, deposition, and splashing. Rebound and deposition regimes can be switched up to Weber number We < 13 ± 3, while deposition and splashing can be switched in the range of 32 < We < 52. Because a permanent magnet is used, no permanent power supply is required for maintaining the particular regime of droplet impact. The presented technology is highly flexible and enables selective fabrication and actuation of microstructures on complex devices. It has great potential for applications in soft robotics, microfluidics, and advanced thermal management.

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Author:Matija Jezeršek, Raphael Kriegl, Gaia Kravanja, Luka Hribar, Irena Drevenšek-OlenikORCiD, Heiko UnoldGND, Mikhail Shamonin (Chamonine)ORCiDGND
DOI:https://doi.org/10.1002/admi.202202471
Parent Title (English):Advanced Materials Interfaces
Publisher:Wiley
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2023/07/14
Volume:10
Issue:11
Article Number:2202471
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
Kostenträger (Forschungsprojekt, Labor, Einrichtung etc.):DFG - 437391117
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International