Magnetically actuated surface microstructures for efficient transport and tunable separation of droplets and solids

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

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.

• Jezik: Angleški jezik
• Ključne besede: magnetoresponsive surfaces, laser micromachinings, object transportations, object separations, magnetoactive elastomers
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo ; FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: 11 str.
• Številčenje: Vol. 25, iss. 22, art. 2301000
• PID: 20.500.12556/RUL-152633
• UDK: 620.3
• ISSN pri članku: 1438-1656
• DOI: 10.1002/adem.202301000
• COBISS.SI-ID: 167150595
• Datum objave v RUL: 01.12.2023

Gradivo je del revije

• Naslov: Advanced engineering materials
• Skrajšan naslov: Adv. eng. mater.
• Založnik: Wiley
• ISSN: 1438-1656
• COBISS.SI-ID: 21394693

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: magnetoaktivni elastomeri, magnetno odzivne površine, lasersko mikrostrukturiranje, transport, separacija