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Non-equilibrium thermodynamics of the gas–liquid interface: measurement of the Onsager heat of transport for nitrous oxide at the surface of water
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Daniel M. Packwood
Published/Copyright:
June 7, 2010
Abstract
The Onsager heat of transport, Q*, for nitrous oxide at the surface of water has been measured by using high-resolution diode-laser spectroscopy to monitor the partial pressure of N2O as a function of the temperature difference across a 5-mm vapour gap above the water surface. The metal surface above the vapour gap was conditioned with ammonia prior to the measurements, to enable efficient thermal accommodation at that surface, which allowed the temperature difference to be as large as 15 K. We find Q* = –6.6 ± 0.85 kJ mol–1, so that Q*/RT is –2.9 at T = 275.15 K. These experiments are a necessary preliminary to a planned series of measurements of Q* for CO2 at the surface of simulated sea water.
Received: 2009-10-18
Accepted: 2009-11-17
Published Online: 2010-06-07
Published in Print: 2010-April
© de Gruyter 2010
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- Theoretical and experimental comparison of the Soret effect for binary mixtures of toluene and n-hexane, and benzene and n-heptane
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