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Microstructured Magnetoactive Elastomers for Switchable Wettability

  • We demonstrate the control of wettability of non-structured and microstructured magnetoactive elastomers (MAEs) by magnetic field. The synthesized composite materials have a concentration of carbonyl iron particles of 75 wt.% (≈27 vol.%) and three different stiffnesses of the elastomer matrix. A new method of fabrication of MAE coatings on plastic substrates is presented, which allows one to enhance the response of the apparent contact angle to the magnetic field by exposing the particle-enriched side of MAEs to water. A magnetic field is not applied during crosslinking. The highest variation of the contact angle from (113 ± 1)° in zero field up to (156 ± 2)° at about 400 mT is achieved in the MAE sample with the softest matrix. Several lamellar and pillared MAE structures are fabricated by laser micromachining. The lateral dimension of surface structures is about 50 µm and the depth varies between 3 µm and 60 µm. A systematic investigation of the effects of parameters of laser processing (laser power and the number of passages of the laser beam) on the wetting behavior of these structures in the absence and presence of a magnetic field is performed. In particular, strong anisotropy of the wetting behavior of lamellar structures is observed. The results are qualitatively discussed in the framework of the Wenzel and Cassie-Baxter models. Finally, directions of further research on magnetically controlled wettability of microstructured MAE surfaces are outlined. The obtained results may be useful for the development of magnetically controlled smart surfaces for droplet-based microfluidics.

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Author:Raphael Kriegl, Gaia Kravanja, Luka Hribar, Lucija Čoga, Irena Drevenšek-OlenikORCiD, Matija Jezeršek, Mitjan Kalin, Mikhail Shamonin (Chamonine)ORCiDGND
DOI:https://doi.org/10.3390/polym14183883
Pubmed Id:https://pubmed.ncbi.nlm.nih.gov/36146027
Parent Title (English):Polymers
Publisher:MDPI
Document Type:Article
Language:English
Year of first Publication:2022
Release Date:2022/10/28
Volume:14
Issue:18
Article Number:3883
First Page:1
Last Page:21
Note:
Corresponding authors: Raphael Kriegl und Mikhail Shamonin
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International