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LAB
SPARKS
Quartz
Crystal Microbalance Sensor
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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:
- Layer-by-layer
deposition of polyionic layers. (R. Advincula, S. Dante,
C. Frank, and P. Stroeve)
- Adsorption
of proteins and subsequent enzymatic cleavage. (G. Trigante,
A. Gast, and C. Robertson)
- Adsorption
of fluoropolymer films onto a-carbon. (L. Bailey, C. Frank,
and G. Tyndall)
- Electrochemical
polymerization of oligomeric vinyl carbazole. (S. Inaoka,
R. Advincula, D. Roitman, and K. Kanazawa)
- Mechanical
properties of adsorbed lubricant films. (J. Pacansky, R.
Waltman, and K. Kanazawa)
- Permeation
of water into polymers. (M. Oye, Dawn Wellington, Marvi
Matos, R.D. Miller, K. Carter, A. Knoesen, K. Kanazawa,
...a CPIMA SURE program)
- Dissolution
behavior of photolithographic polymers (Seok-Won Lee, W.D.
Hinsberg, and K. Kanazawa. This work is just beginning.)
- YOUR
IDEA!...contact kanazawa@chemeng.stanford.edu
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