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Issue 19, 2010
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Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

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Abstract

In this paper it is demonstrated that short chain alkanes (pentane, hexane, heptane, octane) can be adsorbed from a saturated vapour phase at the water–air interface. Measurements with the drop profile analysis tensiometry demonstrate that this molecular adsorption transfers into a condensation leading to a thin alkane film at the drop surface. At sufficient amounts, i.e. after such a film has reached a respective thickness, the condensed liquid starts to drain and an oil lens of alkane is formed at the water drop apex. The formation of such oil lenses is visually observed and leads to the situation that the obtained surface tensions are only effective values because the Laplace equation of capillarity does no longer describe the profile of the drop/oil lens. This is clearly demonstrated by the standard deviation of the profile fitting and the distribution of the deviation between experimental and calculated profile.

Graphical abstract: Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

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Publication details

The article was received on 11 May 2010, accepted on 22 Jul 2010 and first published on 20 Aug 2010


Article type: Paper
DOI: 10.1039/C0SM00367K
Citation: Soft Matter, 2010,6, 4710-4714
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    Adsorption of alkanes from the vapour phase on water drops measured by drop profile analysis tensiometry

    A. Javadi, N. Moradi, H. Möhwald and R. Miller, Soft Matter, 2010, 6, 4710
    DOI: 10.1039/C0SM00367K

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