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Persistence of bending and torsional modes in piezoelectric-excited millimeter-sized cantilever (PEMC) sensors in viscous liquids - 1 to 103 cP

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2 Author(s)
Johnson, Blake N. ; Department of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, USA ; Mutharasan, Raj

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Cantilever sensors consisting of only a piezoelectric layer express both bending and torsional modes near ∼25 kHz that persist with reasonable Q-values (∼15) in liquids of high viscosity (>100 cP). Responses of both bending and torsional modes in liquids (1-1019 cP) were measured simultaneously. The bending mode response was more sensitive to mass-change effects than the torsional mode, and the response in liquids <70 cP matched theoretical values within 0.9%. At 1019 cP the bending mode response was within 10.4% of theory. The bending and torsional modes in PEMC can potentially be used simultaneously for bio-chemical sensing in very viscous samples.

Published in:

Journal of Applied Physics  (Volume:109 ,  Issue: 6 )