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Magnetic-responsive bendable nozzles for open surface droplet manipulation

  • The handling of droplets in a controlled manner is essential to numerous technological and scientific applications. In this work, we present a new open-surface platform for droplet manipulation based on an array of bendable nozzles that are dynamically controlled by a magnetic field. The actuation of these nozzles is possible thanks to the magnetically responsive elastomeric composite which forms the tips of the nozzles; this is fabricated with Fe3O4 microparticles embedded in a polydimethylsiloxane matrix. The transport, mixing, and splitting of droplets can be controlled by bringing together and separating the tips of these nozzles under the action of a magnet. Additionally, the characteristic configuration for droplet mixing in this platform harnesses the kinetic energy from the feeding streams; this provided a remarkable reduction of 80% in the mixing time between drops of liquids about eight times more viscous than water, i.e., 6.5 mPa/s, when compared against the mixing between sessile drops of the same fluids

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Document Type:Article
Author:Lizbeth Ofelia Prieto-LopezORCiD, Jiajia Xu, Jiaxi CuiORCiD
Parent Title (English):Polymers
Year of first Publication:2019
Release Date:2022/11/18
Tag:magnetic responsive elastomers; open-surface microfluidics; roplet manipulation
Impact:03.426 (2019)
Funding Information:BMBF: 031A360D.
Open Access:Open Access
Signature:INM 2019/168
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International