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Date:  Tue, April 26, 2022
Time:  1:00pm - 2:00pm
Location:  Holmes 389; online available, see below registration info
Speaker:  Saige Dacuycuy, candidate for MS, advisor: Dr. Wayne Shiroma

Online available, register for connection info at https://forms.gle/yeGtuLSFYqgbEJg86

Abstract

The unique properties of liquid metal, such as high electrical conductivity, high thermal conductivity, and deformability, offers promising opportunities for emerging devices and circuits. The focus of this thesis is on actuating liquid metal for potential applications in hot-spot cooling, sensing, and commu-nications. First, continuous electrowetting of a liquid-metal droplet is demonstrated for controlled two-dimensional actuation and selective hot-spot cooling. In a 3 cm x 3 cm well, a Galinstan liquid-metal droplet could move at a terminal velocity of 13.3 cm/s with an actuation voltage of 11 V DC. For an actuation voltage of 10 V DC, the liquid-metal droplet decreases the temperature of a localized hot spot by approximately 7 °C. Next, controlled deformation of liquid metal by electrocapillary actuation is demonstrated in fluidic channels at the sub-millimeter-length scale. In 100-μm-deep channels of varying widths, the Galinstan liquid metal could move at velocities greater than 40 mm/s. The dynamic behavior and physical limitations of the liquid metal as it moves in the fluidic channels is described and is useful for designing microsystems that use liquid metal as a functional material.

Biography

Saige Dacuycuy is currently an MS student in Electrical Engineering at the University of Hawaiʻi at Mānoa. He received his BS degree in Physics from Colorado Mesa University. His main research interests are in microfluidics and reconfigurable electronics.