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Proceedings Paper

On the reliability of thermopneumatic actuators with silicon membranes
Author(s): Albert K. Henning
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Paper Abstract

The application of thermopneumatic actuators to microvalves and microfluidic processing systems continues to attract research and development interest. Yet, as with most microvalve and microfluidic work, little information has been reported with respect to the reliability of microfluidic and microflow systems. In this work, therefore, we extend our earlier discussions of factors affecting silicon membrane reliability, to encompass particular effects of thermopneumatic actuators on such membranes. Specifically, we report experiments demonstrating the effect of cavitation in thermopneumatic actuators on silicon membranes. These experiments show that the nature of cavitation, in a hermetic, thermopneumatic actuator cavity which includes a silicon membrane, is to initiate fast transient pressure pulses in the cavity. The membrane moves mechanically in response to these pressure pulses. If the magnitude of these pressure pulses causes the membrane stress to exceed the silicon yield strength, then fracture of the membrane can occur. The work concludes with a conceptual approach to the design of thermopneumatic actuators, to ensure this failure mode does not occur.

Paper Details

Date Published: 19 January 2007
PDF: 12 pages
Proc. SPIE 6463, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS VI, 64630K (19 January 2007); doi: 10.1117/12.697818
Show Author Affiliations
Albert K. Henning, Aquarian Microsystems (United States)

Published in SPIE Proceedings Vol. 6463:
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS VI
Allyson L. Hartzell; Rajeshuni Ramesham, Editor(s)

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