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19 October 1994 Thermogravimetric analysis of selected condensed materials on a quartz crystal microbalance
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Employing a quartz crystal microbalance and a quadrupole mass spectrometer in a vacuum chamber, thermogravimetric analyses (TGA) and mass spectrometer analyses have been performed at low temperature on depositions of ammonia, acetone, methanol, toluene, isopropyl alcohol, water, para-xylene, and selected combinations. Deposition of a single species yielded a TGA curve characteristic of a pure substance. Homogeneous binary mixtures, like methanol and water, exhibited a desorption curve which included structure that was intermediate to that observed for pure materials. Sequential layering of one material on top of another also altered the TGA response, and the TGA curve shape was found to be a function of top-layer thickness for the water-on-methanol system. Backfilling the chamber with nitrogen or argon at a pressure of 1 Torr shifted the sublimation temperature of water about 20 K higher.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Brent Bargeron, Terry E. Phillips, and Richard C. Benson "Thermogravimetric analysis of selected condensed materials on a quartz crystal microbalance", Proc. SPIE 2261, Optical System Contamination: Effects, Measurements, and Control IV, (19 October 1994);

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