Non-equilibrium thermodynamics of the gasliquid interface: Measurement of the Onsager heat of transport for nitrous oxide at the surface of water

Daniel M. Packwood, Leon F. Phillips

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    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 mol1, 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.

    Original languageEnglish
    Pages (from-to)75-84
    Number of pages10
    JournalJournal of Non-Equilibrium Thermodynamics
    Volume35
    Issue number1
    DOIs
    Publication statusPublished - 2010 Apr 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Physics and Astronomy(all)

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