Abstract
We have developed a sensitive method of determining enthalpy changes for gas-surface interactions: quartz microbalance microcalorimetry. We mount in an isoperibol environment both sample and reference combinations of a quartz crystal microbalance (QCM) in intimate thermal contact with a heat flow sensor. We coat the sample QCM with a thin (∼1 µm) polymer film. By exposing the film to ethanol vapor, we measure simultaneously the change in mass per unit area (to ±0.25 ng cm−2) and the resulting heat flows (to ±50 nW) when the polymer adsorbs or desorbs ethanol. The molar enthalpies of sorption of ethanol vapor in Tecoflex, an aliphatic polyurethane elastomer, are ΔadsorptionH= −53±8 kJ mol−1 and ΔdesorptionH=52±3 kJ mol−1.
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References
F. Gundert and B. A. Wolf, in J. Brandrup, I. E. H. (Eds.): Polymer Handbook, John Wiley & Sons, New York 1989, p. VII/173-VII/182.
E. A. Grulke, in J. Brandrup and E. H. Immergut (Eds.): Polymer Handbook, John Wiley & Sons, New York 1989, p. VII/519-VII/560.
R. A. Orwoll, in J. Brandrup and E. H. Immergut (Eds.): Polymer Handbook, John Wiley & Sons, New York 1989, p. VII/497-VII/516.
D. R. Lloyd, T. C. Ward and H. P. Schreiber, Inverse Gas Chromatography: Characterization of Polymers and Other Materials, Vol. 391, American Chemical Society, Washington DC 1989.
A. L. Smith, H. Shirazi and I. Wadsö, Recent Advances in the Chemistry and Physics of Fullerenes and Related Materials (San Diego, CA), The OCM/HCC: simultaneous, isothermal, high sensitivity measurements of mass change and heat flow in polymer and fullerene films, pp. 576-585 (1998).
M. D. Ward and D. A. Buttry, Science, 249 (1990) 1000.
J. W. Grate, S. J. Martin and R. M. White, Analytical Chemistry, 65 (1993) 940A-948A, 987A–996A.
G. Sauerbrey, Z. Physik, 155 (1959) 206.
J. F. Alder and J. J. McCallum, Analyst, 108 (1983) 1169.
J. J. McCallum, Analyst, 114 (1989) 1173.
I. Wadsö, Chem. Soc. Rev., 1997 (1997) 79.
S. J. Martin, V. E. Granstaff and G. C. Frye, Anal. Chem., 63 (1991) 2272.
J. Auge, P. Hauptmann, J. Hartmann, S. Rosler and R. Lucklum, Sensors and Actuators B, 24–25 (1995) 43.
V. Tsionsky and E. Gileadi, Langmuir, 10 (1994) 2830.
D. A. Buttry and M. D. Ward, Chemical Reviews, 92 (1992) 1355.
R. Zhou, A. Hierlemann, U. Weimar and W. Göpel, Sensors and Actuators B, 34 (1996) 356.
J. W. Grate, A. Snow, D. S. Ballantine, H. Wohltjen, M. H. Abraham, R. A. McGill and P. Sasson, Anal. Chem., 60 (1988) 869.
J. W. Grate, S. N. Kaganova and V. R. Bhethanabotla, Anal. Chem., 70 (1998) 199.
H. L. Bandey, A. R. Hillman, M. J. Brown and S. J. Martin, Faraday Discussion, 107 (1997) 105.
R. Lucklum and P. Hauptmann, Faraday Discussion, 107 (1997) 123.
J. W. Grate, S. N. Kaganove and V. R. Bhethanabotla, Faraday Discussion, 107 (1997) 259.
R. Gavara, R. Catala, S. Aucejo, D. Cabedo and R. Hernandez, J. Poly. Sci. B: Polymer Phys., 34 (1996) 1907.
H. Shirazi, A. L. Smith and D. Schneider, in preparation.
J. W. Grate, M. H. Abraham and R. A. McGill, in E. Kress—Rogers (Ed.): Handbook of Biosensors and Electronic Noises, CRC Press, Boca Raton 1997, p. 593-612.
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Smith, A.L., Shirazi, H.M. Quartz Microbalance Microcalorimetry: A new method for studying polymer-solvent thermodynamics. Journal of Thermal Analysis and Calorimetry 59, 171–186 (2000). https://doi.org/10.1023/A:1010192113958
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DOI: https://doi.org/10.1023/A:1010192113958