Title :
A Novel Configurable MEMS Inertial Switch using Microscale Liquid-Metal Droplet
Author :
Yoo, Kwanghyun ; Kim, Joonwon
Author_Institution :
Dept. of Mech. Eng. of Sci. & Technol., POSTECH, Pohang
Abstract :
This paper presents a novel MEMS inertial switch using a microscale liquid-metal droplet as an active component. Our inertial switch is realized using the advantageous properties of the liquid-metal droplet (i.e., high surface tension, high density and electrical conduction) and the selectively modified contact surface. The modified contact surface contains microstructures which provide enhancement of non-wetting behavior as well as minimization of the contact angle hysteresis (CAH) of the liquid-metal droplet on the surface. Integrating the liquid-metal droplet, which is used as an inertial proof mass, inside the configured channel containing the microstructures on the surface, a dramatically simplified yet effective mechanism of inertial switch is realized. Various channel configurations can be designed for different threshold-levels of acceleration.
Keywords :
contact angle; drops; liquid metals; microchannel flow; microfluidics; microswitches; surface tension; MEMS inertial switch; channel configurations; contact angle hysteresis; inertial proof mass; microscale liquid-metal droplet; nonwetting behavior; surface tension; Micromechanical devices; Switches;
Conference_Titel :
Micro Electro Mechanical Systems, 2009. MEMS 2009. IEEE 22nd International Conference on
Conference_Location :
Sorrento
Print_ISBN :
978-1-4244-2977-6
Electronic_ISBN :
1084-6999
DOI :
10.1109/MEMSYS.2009.4805502