Zusammenfassung
In diesem Beitrag wird ein Konzept für eine schnelle thermopneumatische Aktuation einer dünnen, flexiblen PDMS-Membran vorgestellt. Dabei wird die Temperatur einer Arbeitsflüssigkeit in einem kolbenähnlichen Flüssigkeitsreservoir mittels eines Mikro-Peltier-Elements gesteuert. Durch Variation der Temperatur der Arbeitsflüssigkeit, in diesem Fall Ethanol, wird über die volumetrische thermische Ausdehnung direkt eine Auslenkung der Membran erzielt. Das Abschnüren und anschließende Öffnen eines mikrofluidischen Kanals oberhalb der Membran benötigt nur wenige Sekunden. Das vorgestellte Setup kann für die Realisierung von schnellen und robusten mikrofluidischen Ventilen und Pumpen benutzt werden.
Summary
In this paper we present a concept for fast thermo-pneumatic actuation of a thin flexible PDMS membrane using a micro Peltier-element for controlling the temperature of the working fluid in a piston-like liquid reservoir. By adjusting the temperature of the working fluid, in our case ethanol, the volumetric thermal expansion is controlled, which is in turn directly coupled to membrane deflection. Pinch-off and subsequent release of a microfluidic channel above the membrane is achieved in a few seconds. The proposed setup can be potentially utilized for the realization of fast and robust microfluidic valves and pumps.
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Lederer, T., Hilber, W. & Jakoby, B. Fast thermo-pneumatic actuation of a thin PDMS membrane using a micro Peltier-element for microfluidic applications. Elektrotech. Inftech. 126, 70–74 (2009). https://doi.org/10.1007/s00502-009-0605-9
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DOI: https://doi.org/10.1007/s00502-009-0605-9