Electric Field Driven Addressing of Oil-in-Water Droplets in the Presence of Gradients of Ionic and Nonionic Surfactants
| Autor: | Zdenek Slouka, Pavel Beranek, Lucie Vobecká, Michal Pribyl, Jakub Tucek |
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| Rok vydání: | 2016 |
| Předmět: |
endocrine system
Materials science Analytical chemistry Nanotechnology 02 engineering and technology Dielectric complex mixtures 01 natural sciences Industrial and Manufacturing Engineering Surface tension Pulmonary surfactant Phase (matter) Electric field Electrical and Electronic Engineering Marangoni effect Chemistry 010401 analytical chemistry technology industry and agriculture 021001 nanoscience & nanotechnology eye diseases 0104 chemical sciences Electrophoresis Control and Systems Engineering Chemical physics Electric potential 0210 nano-technology |
| Zdroj: | IAS |
| ISSN: | 1939-9367 0093-9994 |
| DOI: | 10.1109/tia.2016.2563391 |
| Popis: | We deal with controlled transport (addressing) of dielectric kerosene droplets dispersed on water surface by dc electric field in the presence of surfactants. Experimental planar microfluidic platform with a central chamber and two electrode compartments enables formation of concentration gradients of cationic, anionic, or nonionic surfactants. We show that a kerosene droplet always moves away from the surfactant reservoir due to the Marangoni phenomenon. The release of ionic surfactants can be well controlled by imposed electric field. Once surfactant molecules reach the surface of the water phase, the Marangoni phenomenon pulls the kerosene droplet in the direction from the surfactant reservoir. Thus, the observed mechanism does not rely on the classical electrophoretic migration of charged macroscopic objects-droplets. As the dependence of droplet motion on the absolute value of electric field strength is linear, apparent droplet mobilities are evaluated. Finally, we discuss the use of the observed phenomenon for droplet addressing in fluidic systems. |
| Databáze: | OpenAIRE |
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