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In order to detect the position of a droplet on a piezoelectric substrate, a smartphone-based location method is developed. A transportation video is recorded and then analyzed using the smartphone. An algorithm for identifying the droplet in the captured image is presented, and the center distance of the droplet is calculated by analyzing the color information of the image. A black ink solution droplet is demonstrated for determining droplet position using a self-developed app. The results show that the droplet position is 201 pixels at the 11th second and its transportation velocity is 0.37 mm/s from the 2nd second to the 11th second at 27.5 dBm electric signal power. [ABSTRACT FROM AUTHOR]

A new method for fabricating a paper based microfluidic device in a printed circuit board is presented. The printed circuit board is hollowed out to form a pattern of paper channels. When a polydimethylsiloxane (PDMS) film is mounted on the bottom of the PCB, liquid PDMS is filled in the areas having been hollowed out, and solidified in a constant temperature oven. Paper pattern is then mounted on the solidified PDMS, while a piezoelectric device with an interdigital transducer is embedded into the PCB. At last, PDMS film is covered on the surface of paper channels. Microfluidic transportation and color development reaction are demonstrated in presented microfluidic platform. Results show paper channels and the piezoelectric device can be integrated into the printed circuit board, and surface acoustic wave can drive a microfluid to the paper channels for microfluidic analysis. [ABSTRACT FROM PUBLISHER]