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[Review of Scientific Instruments] Optothermally actuated capillary burst valve


We demonstrate the optothermal actuation of individual capillary burst valves in an all-polymer microfluidic device. The capillary burst valves are realised in a planar design by introducing a fluidic constriction in a microfluidic channel of constant depth. We show that a capillary burst valve can be burst by raising the temperature due to the temperature dependence of the fluid surface tension. We address individual valves by using a local heating platform based on a thin film of near infrared absorber dye embedded in the lid used to seal the microfluidic device [L. H. Thamdrup et al., Nano Lett. 10, 826–832 (2010)]. An individual valve is burst by focusing the laser in its vicinity. We demonstrate the capture of single polystyrene 7 μm beads in the constriction triggered by the bursting of the valve.

Johan Eriksen1, Brian Bilenberg2, Anders Kristensen1, and Rodolphe Marie1,a)Hide Affiliations 1DTU Nanotech, Technical University of Denmark, Oersted Plads, Building 345C, DK-2800 Kongens Lyngby, Denmark 2NIL Technology ApS, DK-2800 Kongens Lyngby, Denmark a)rcwm@nanotech.dtu.dk

Review of Scientific Instruments 88, 045101 (2017); doi: http://dx.doi.org/10.1063/1.4979164

Link: http://aip.scitation.org/doi/10.1063/1.4979164

#05022017 #capillary #microchannels #valve

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