Abstract
We report experimental evidence for a controllable capillary micromanipulation method that enables micro-scale droplets to be deposited flexibly for self-alignment release. By controlling the water condensation on a probe-tip, the volume of the droplet is varied dynamically, which helps to establish an appropriate initial droplet for liquid deposition on the desired substrate. The droplet deposition and self-alignment processes were experimentally characterized to verify the performance potential of the proposed integrated method, using a customized motion platform equipped with viewing microscopes. The results demonstrated that the contact angle and the droplet volume on the probe-tip varied during water condensation control. Accordingly, the deposited droplets could be regulated by changing the stretching speed. A 100% success rate in 36 trials was achieved in releasing polystyrene microspheres with diameters of 100 μm and 200 μm, and the released microspheres with offset moved to the desired target destinations under temperature control. The results provide a promising solution for self-alignment management of the assembly of micro-parts.
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