Abstract
Surface reaction is widely used in microfluidic systems for sensitive detection of biomolecules. In this study, we demonstrated to generate and control flow by combination of an AC electrothermal (ET) effect induced by the electric property gradient of fluid due to nonuniform temperature under an electric field and a photothermal (PT) effect induced by the absorption of light energy. The temperature distribution generated by the PT effect would contribute to the electric property gradient, as a trigger for the ET flow. Several flow patterns which were controllable just by changing laser irradiation point was confirmed both by experiment and simulation.
