Temperature uniformity of microdroplet heated by Rayleigh Surface Acoustic Wave in view of biological reaction

In this paper, we have studied the temperature uniformity of microdroplet heated by Rayleigh surface acoustic wave for discrete microfluidic applications such as biological reactions. A longitudinal wave is radiated into the liquid placed on the wave path and induces the well known surface acoustic wave streaming. To precisely ascertain the temperature uniformity, we have used a non-contact method based on infraed thermography so as to not interfer with the biological reaction. We then have tested the temperature uniformity as a function of three parameters: the microdroplet volume, the Rayleigh surface acoustic wave frequency and the injected power. Based on these results, we propose a new device structure to develop a futur lab on chip based temperature reaction.