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Issue 8, 2019
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Barrier kinetics of adsorption–desorption of alcohol monolayers on water under constant surface tension

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Abstract

The desorption of spread decanol and dodecanol monolayers at controlled constant surface tension is shown to proceed under mixed barrier-diffusion control; the role of the convective diffusion is also discussed. The desorption rate is measured as a function of the density of the monolayer and the temperature. The rate of barrier desorption increases as the monolayer approaches the collapse point, reaching an infinite value. The average desorption time of an adsorbed dodecanol molecule increases linearly with the area per molecule, and is phase-specific – it is higher for the liquid condensed state of the monolayer than for the liquid expanded. The desorption rate increases with temperature; the activation energy for desorption is independent of the compression and the surface phase. The increase of the intensity of convection is shown to produce a vanishingly thin diffusion layer and causes the desorption to proceed under pure barrier control. A schematic map of the adsorption–desorption regimes acting as a function of time and intensity of the convection is constructed. General expressions for the rate of adsorption and desorption of alcohols are formulated.

Graphical abstract: Barrier kinetics of adsorption–desorption of alcohol monolayers on water under constant surface tension

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Publication details

The article was received on 10 Oct 2018, accepted on 08 Jan 2019 and first published on 09 Jan 2019


Article type: Paper
DOI: 10.1039/C8SM02076K
Soft Matter, 2019,15, 1730-1746

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    Barrier kinetics of adsorption–desorption of alcohol monolayers on water under constant surface tension

    I. L. Minkov, D. Arabadzhieva, I. E. Salama, E. Mileva and R. I. Slavchov, Soft Matter, 2019, 15, 1730
    DOI: 10.1039/C8SM02076K

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