Viscosity Sensor in Solutions Using a Piezoelectric Quartz Crystal

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  • KUROSAWA Shigeru
    Department of Physical Chemistry and Biophysics, Faculty of Pharmaceutical Sciences, Hokkaido University National Institute of Materials and Chemical Research
  • NEMOTO Eiji
    Department of Mechanical Engineering, Ibaraki National College of Technology
  • MURATSUGU Makoto
    Department of Laboratory Medicine, Asahikawa Medical College
  • KAMO Naoki
    Department of Physical Chemistry and Biophysics, Faculty of Pharmaceutical Sciences, Hokkaido University

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Other Title
  • 水晶振動子による溶液粘度センサー
  • スイショウ シンドウシ ニ ヨル ヨウエキ ネンド センサー エイブン

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When a piezoelectric quartz crystal is dipped into a solution, viscosity ambient to the crystal greatly affects resonant frequency. Resonant frequency was determined by a spectrum analyzer for various solutions whose viscosity was altered by the addition of sucrose. A proportional relationship between change in frequency at series resonant point ΔFs and √ρη up to 25.45 [g1/2·cm-3/2·cp1/2] was demonstrated. Beyond this value, some deviation from linearity was observed. ρ is the density of a solution and η, viscosity. In the present method in contrast to the previous resonance method [Kurosawa et al., Anal. Chim. Acta, 274, (1993)] the linear relation of ΔFs with √ρη holds over a wider range, thus reducing the time required for analysis and assuring greates accuracy of results.

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