Micro Manipulation by DPLUS Ultrasonic Tweezers through Pipetting

Abstract

This report presents a micro manipulation strategy to take single micro wire out of water by DPLUS ultrasonic tweezers at high frequency. A low-loss and high-power device DPLUS (Double Parabolic reflectors wave-guided high-power ultrasonic transducer) was used as the ultrasonic tweezers. In the experiment, the axially vibrating needle of DPLUS was immersed in the water. When the needle tip touches the micro sample, sample was captured on the tip of needle. As the needle moved out of water, the sample could also be out of the water in a droplet on the needle tip. In this way, taking micro samples out of water can be achieved by ultrasonic pipetting method. Then, after the vibrating needle with a micro sample on the tip was inserted into water again, the captured sample was still on the tip of needle. When the ultrasound was turned off, captured sample could be controllably released. In this work, copper wires with a diameter 60 μm and length of 0.5-2 mm were used as sample.