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Effect of Material Composition on Tunable Surface Roughness of Magnetoactive Elastomers

  • We investigated magnetic-field-induced modifications of the surface roughness of magnetoactive elastomers (MAEs) with four material compositions incorporating two concentrations of ferromagnetic microparticles (70 wt% and 80 wt%) and exhibiting two shear storage moduli of the resulting composite material (about 10 kPa and 30 kPa). The analysis was primarily based on spread optical reflection measurements. The surfaces of all four materials were found to be very smooth in the absence of magnetic field (RMS roughness below 50 nm). A maximal field-induced roughness modification (approximately 1 m/T) was observed for the softer material with the lower filler concentration, and a minimal modification (less than 50 nm/T) was observed for the harder material with the higher filler concentration. All four materials showed a significant decrease in the total optical reflectivity with an increasing magnetic field as well. This effect is attributed to the existence of a distinct surface layer that is depleted of microparticles in the absence of a magnetic field but becomes filled with particles in the presence of the field. We analyzed the temporal response of the reflective properties to the switching on and off of the magnetic field and found switching-on response times of around 0.1 s and switching-off response times in the range of 0.3-0.6 s. These observations provide new insight into the magnetic-field-induced surface restructuring of MAEs and may be useful for the development of magnetically reconfigurable elastomeric optical surfaces.

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Metadaten
Author:Gašper GlavanORCiD, Wolfgang Kettl, Alexander Brunhuber, Mikhail Shamonin (Chamonine)ORCiDGND, Irena Drevenšek-OlenikORCiD
DOI:https://doi.org/10.3390/polym11040594
Parent Title (English):Polymers
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of first Publication:2019
Release Date:2022/02/01
Tag:magnetically tunable surface reflectivity; magnetically tunable surface roughness; magnetorheological elastomer; magnetorheological polymers; surface properties
Volume:11
Issue:4
Article Number:594
First Page:1
Last Page:13
Note:
Corresponding author: Gašper Glavan
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