Caltech Nanofabrication Group

  • Increase font size
  • Default font size
  • Decrease font size
Home Publications

Electrical Microfluidic Pressure Gauge for Elastomer Microelectromechanical Systems

Research Area: Microfluidics/Biomedical Year: 2007
Type of Publication: Article Keywords: elastomers, electric resistance, microfluidics, microvalves, pressure gauges
Authors: Kartalov, Emil; Maltezos, George; Anderson, W. F.; Taylor, C. R.; Scherer, Axel
Journal: Journal of Applied Physics Volume: 102
Number: 8 Pages: 084909
Month: October
We report on an electrical microfluidic pressure gauge. A polydimethylsiloxane microvalve closes at a characteristic applied pressure determined by the material's properties and the valve's dimensions. Hence, when the same pressure is applied to all valves of a heterogeneous valve array, some valves close while others remain open. The state of the array is combined with knowledge of the respective characteristic closing pressures of the individual valves to yield an estimate of the applied pressure. The state of each valve is obtained by electrical measurements, since the electrical resistance of the respective underlying fluid-filled channel increases by at least two orders of magnitude as the valve closes and its insulating elastomer material interrupts the electrical circuit. The overall system functions as a pressure gauge with electrical readout. This device would be a critical component in active pressure-regulation loops in future integrated microfluidic systems.
Full text:
PDF: Caltech only
Online version (publisher)


Administrative and Financial Contact

Kate Finigan
MC 200-79, Caltech
1200 E California Blvd
Pasadena, CA 91125

Office:  215 Powell-Booth
Phone:  626.395.4585
Fax: 626.577.8442