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Quartz Crystal Microbalance Sensor

Highlight from section(s) Facilities, Industrial Interactions

The quartz crystal microbalance (QCM) sensor has recently been put into place in the Stanford CPIMA Shared Facilities and is experiencing a surge of use. This sensor is extraordinarily sensitive to mass changes associated with the deposition of material onto the surface of a quartz crystal. These changes are sensed as changes in the natural resonant frequency of the QCM.

The QCM is also sensitive to the mechanical losses in the film, which give rise to increasing resonance widths. This increasing width or decreasing quality factor (Q) is measured as an increase in the equivalent circuit resistance. Some of the exciting uses to which the QCM is being put include the following:

  1. Layer-by-layer deposition of polyionic layers. (R. Advincula, S. Dante, C. Frank, and P. Stroeve)
  2. Adsorption of proteins and subsequent enzymatic cleavage. (G. Trigante, A. Gast, and C. Robertson)
  3. Adsorption of fluoropolymer films onto a-carbon. (L. Bailey, C. Frank, and G. Tyndall)
  4. Electrochemical polymerization of oligomeric vinyl carbazole. (S. Inaoka, R. Advincula, D. Roitman, and K. Kanazawa)
  5. Mechanical properties of adsorbed lubricant films. (J. Pacansky, R. Waltman, and K. Kanazawa)
  6. Permeation of water into polymers. (M. Oye, Dawn Wellington, Marvi Matos, R.D. Miller, K. Carter, A. Knoesen, K. Kanazawa, …a CPIMA SURE program)
  7. Dissolution behavior of photolithographic polymers (Seok-Won Lee, W.D. Hinsberg, and K. Kanazawa. This work is just beginning.)
  8. YOUR IDEA!…contact procmon@msn.com