Gaia Kravanja (Author), Raphael Kriegl (Author), Luka Hribar (Author), Gašper Glavan (Author), Irena Drevenšek Olenik (Author), Mikhail Shamonin (Author), Matija Jezeršek (Author)

Abstract

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 on a plastic substrate is reported for these purposes. The physical origin of the propulsion is the bending of soft magnetic lamellae in nonuniform 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 microstructured 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.

Keywords

magnetoaktivni elastomeri;magnetno odzivne površine;lasersko mikrostrukturiranje;transport;separacija;magnetoresponsive surfaces;laser micromachining;object transportation;object separation;magnetoactive elastomers;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 620.3
COBISS: 167150595 Link will open in a new window
ISSN: 1438-1656
Views: 20
Downloads: 4
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Other data

Secondary language: Slovenian
Secondary keywords: magnetoaktivni elastomeri;magnetno odzivne površine;lasersko mikrostrukturiranje;transport;separacija;
Type (COBISS): Article
Pages: 11 str.
Volume: ǂVol. ǂ25
Issue: ǂiss. ǂ22, art. no. 2301000
Chronology: Nov. 2023
DOI: 10.1002/adem.202301000
ID: 21372096