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Article Dans Une Revue Langmuir Année : 2020

Impact of Fluorocarbon Gaseous Environments on the Permeability of Foam Films to Air

Résumé

A foam film, free to move and stabilized with tetradecyltrimethylammo-nium bromide or sodium dodecylsulfate surfactants, is deposited inside of a cylindrical tube. It separates the tube into two distinct gaseous compartments. The first compartmentisfilled with air, while the second one contains a mixture of air and perfluorohexane vapor(C6F14), which is a barely water-solublefluorinated compound. This foam film thus acts as a liquid semipermeable membrane for gases equivalent to the solid semipermeable membranes conventionally used in fluid separation processes. To infer the rate of air transfer through the membrane, we measure the displacement of the mobile foam film.From this, we deduce the instantaneous permeability of the membrane. In contrast to the permeability of solid membranes, which inexorably decreases over time because they become clogged, an anticlogging effect is observed with a permeability that systematically increases over time. Because the thickness of thefilm is constant over time, we attribute this to the possibility of adsorbing or desorbing fluorinated gas molecules on the liquid membrane. Indeed, because the partial pressure of the fluorinated gas is high at the beginning of the experiment, the density of the adsorbed molecules is also high, which leads to a low permeability to air transfer. On the contrary, at the end of the experiment, the partial pressure in fluorinated gas and thus the density of the adsorbed molecules are low. This leads to a higher permeability and a less clogged membrane.
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Dates et versions

hal-02997264 , version 1 (10-11-2020)

Identifiants

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Céline Hadji, Benjamin Dollet, Hugues Bodiguel, Wiebke Drenckhan, Benoit Coasne, et al.. Impact of Fluorocarbon Gaseous Environments on the Permeability of Foam Films to Air. Langmuir, 2020, ⟨10.1021/acs.langmuir.0c02158⟩. ⟨hal-02997264⟩
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