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Simultaneous liquid viscosity and density determination with piezoelectric unimorph cantilevers
 

Summary: Simultaneous liquid viscosity and density determination with piezoelectric
unimorph cantilevers
Wan Y. Shiha)
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104-2875 and
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton,
New Jersey 08544-5263
Xiaoping Li, Huiming Gu, and Wei-Heng Shih
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104-2875
Ilhan A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton,
New Jersey 08544-5263
Received 4 January 2000; accepted for publication 31 May 2000
We have examined both experimentally and theoretically a piezoelectric unimorph cantilever as a
liquid viscosity-and-density sensor. The fabricated piezoelectric unimorph consisted of a
PbO·ZrO2·TiO2 PZT layer on a thin stainless-steel plate. In addition to a driving electrode, a
sensing electrode was placed on top of the PZT layer, permitting the direct measurement of the
resonance frequency. The cantilever was tested using water­glycerol solutions of different
compositions. In all three of the tested modes, the resonance frequency decreased while the width
of the resonance peak increased with increasing glycerol content. To account for the liquid effect,
we consider the cantilever as a sphere of radius R oscillating in a liquid. By including the high and

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science