Shaping liquid films by dielectrophoresis
| Autor: | Antonio Ramos, Federico Paratore, Evgeniy Boyko, Moran Bercovici, Amir D. Gat, Israel Gabay |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo, European Union (UE). H2020 |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences 02 engineering and technology Dielectric Physics - Fluid Dynamics Deformation (meteorology) Dielectrophoresis Condensed Matter - Soft Condensed Matter 021001 nanoscience & nanotechnology 01 natural sciences 010309 optics Stress (mechanics) Free surface 0103 physical sciences Soft Condensed Matter (cond-mat.soft) Optoelectronics Digital holographic microscopy 0210 nano-technology business Microscale chemistry Microfabrication |
| Popis: | We present a theoretical model and experimental demonstration of thin liquid film deformations due to a dielectric force distribution established by surface electrodes. We model the spatial electric field produced by a pair of parallel electrodes and use it to evaluate the stress on the interface through Maxwell stresses. By coupling this force with the Young-Laplace equation, we obtain the deformation of the interface. To validate our theory, we design an experimental setup which uses microfabricated electrodes to achieve spatial dielectrophoretic actuation of a thin liquid film, while providing measurements of microscale deformations through digital holographic microscopy. We characterize the deformation as a function of the electrode-pair geometry and film thickness, showing very good agreement with the model. Based on the insights from the characterization of the system, we pattern conductive lines of electrode pairs on the surface of a microfluidic chamber and demonstrate the ability to produce complex two-dimensional deformations. The films can remain in liquid form and be dynamically modulated between different configurations or polymerized to create solid structures with high surface quality. 14 pages and 7 figures in the main manuscript. 4 sections and 5 figures in the SI |
| Databáze: | OpenAIRE |
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