The liquid-vapour transition in monolayers of n-pentadecanoic acid at the air/water interface

Norman R. Pallas; Brian A. Pethica

doi:10.1039/F19878300585

The liquid-vapour transition in monolayers of n-pentadecanoic acid at the air/water interface

Norman R. Pallas, Brian A. Pethica

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Abstract

Using recently developed methods for surface manometry, the first-order two-dimensional phase transition from vapour to liquid in monolayers of ultra-pure n-pentadecanoic acid at the interface between air and aqueous 10^-2 mol dm^-3 HCl has been studied at temperatures from the triple point (17 °C) to 40 °C. Contrary to previous reports, the critical temperature is well above 40 °C. It was not possible with the apparatus and methods developed to date to determine the critical temperature, which is probably in the range of 50-60 °C. The latent heat of the phase transition was obtained as a function of temperature.

Original language	English (US)
Pages (from-to)	585-590
Number of pages	6
Journal	Journal of the Chemical Society, Faraday Transactios 1: Physical Chemistry in Condensed Phases
Volume	83
Issue number	3
DOIs	https://doi.org/10.1039/F19878300585
State	Published - Dec 1 1987
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)

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10.1039/F19878300585

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AU - Pethica, Brian A.

PY - 1987/12/1

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N2 - Using recently developed methods for surface manometry, the first-order two-dimensional phase transition from vapour to liquid in monolayers of ultra-pure n-pentadecanoic acid at the interface between air and aqueous 10-2 mol dm-3 HCl has been studied at temperatures from the triple point (17 °C) to 40 °C. Contrary to previous reports, the critical temperature is well above 40 °C. It was not possible with the apparatus and methods developed to date to determine the critical temperature, which is probably in the range of 50-60 °C. The latent heat of the phase transition was obtained as a function of temperature.

AB - Using recently developed methods for surface manometry, the first-order two-dimensional phase transition from vapour to liquid in monolayers of ultra-pure n-pentadecanoic acid at the interface between air and aqueous 10-2 mol dm-3 HCl has been studied at temperatures from the triple point (17 °C) to 40 °C. Contrary to previous reports, the critical temperature is well above 40 °C. It was not possible with the apparatus and methods developed to date to determine the critical temperature, which is probably in the range of 50-60 °C. The latent heat of the phase transition was obtained as a function of temperature.

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The liquid-vapour transition in monolayers of n-pentadecanoic acid at the air/water interface

Abstract

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