Hyperelastic Pressure Sensing with a Liquid Embedded Elastomer

Yong-Lae Park, Carmel Majidi, Rebecca Kramer, Phillipe Berard, and Robert J. Wood
Journal of Micromechanics and Microengineering, Vol. 20, No. 12, December, 2010


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Abstract
A hyperelastic pressure transducer is fabricated by embedding silicone rubber with microchannels of conductive liquid eutectic gallium–indium. Pressing the surface of the elastomer with pressures in the range of 0–100 kPa will deform the cross-section of underlying channels and change their electric resistance by as much as 50%. Microchannels with dimensions as small as 25 um are obtained with a maskless, soft lithography process that utilizes direct laser exposure. Change in electrical resistance is measured as a function of the magnitude and area of the surface pressure as well as the cross-sectional geometry, depth and relative lateral position of the embedded channel. These experimentally measured values closely match closed-form theoretical predictions derived from plane strain elasticity and contact mechanics.

Notes
Number of pages: 6

Text Reference
Yong-Lae Park, Carmel Majidi, Rebecca Kramer, Phillipe Berard, and Robert J. Wood, "Hyperelastic Pressure Sensing with a Liquid Embedded Elastomer," Journal of Micromechanics and Microengineering, Vol. 20, No. 12, December, 2010

BibTeX Reference
@article{Park_2010_7490,
   author = "Yong-Lae Park and Carmel Majidi and Rebecca Kramer and Phillipe Berard and Robert J. Wood",
   title = "Hyperelastic Pressure Sensing with a Liquid Embedded Elastomer",
   journal = "Journal of Micromechanics and Microengineering",
   month = "December",
   year = "2010",
   volume = "20",
   number = "12",
}