A Low-voltage Droplet Microgripper for Micro-object Manipulation
We present a low-voltage microgripper utilizing a liquid droplet to pick up and release micro-objects. Lifting force is generated by a liquid bridge formed between the gripper surface and an object. Electrowetting was used to dynamically change the capillary lifting forces and enable easy object release. The driving voltage was applied to a pair of coplanar interdigitated electrodes, eliminating the need for an electrode on top of the droplet and thus significantly facilitating object manipulation. A barium strontium titanate insulation layer was used to lower the driving voltage. Experiments indicated that the lifting forces can be as high as 213 µN at a driving voltage of 28 V. Experiments also demonstrated a low-voltage, low power consumption soft microgripper by picking up and releasing micro glass beads.
Journal of Micromechanics and Microengineering
Vasudev, Abhay; Jagtiani, Ashish V.; Du, Li; and Zhe, Jiang, "A Low-voltage Droplet Microgripper for Micro-object Manipulation" (2009). Mechanical Engineering Faculty Research. 953.