Permeation of Gas Through Newton Black Films at Different Chain Length of Thesurfactant

Krustev, R.; Platikanov, Dimo; Stankova, A.; Nedyalkov, M.

doi:10.1080/01932699708943772

Cited by 17 publications

(29 citation statements)

References 13 publications

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“…The permeation rates of thin soap films have been thoroughly investigated; see, for example, the review by Exerowa et al 15 It was established that the permeability is dependent on temperature, the type of electrolyte, type of surfactant, and their concentrations. [16][17][18][19][20][21] The thinnest soap films, known as Newton black films, consist of two surfactant monolayers absorbed onto each other. Somewhat thicker thin soap films, for which the monolayers are separated by a water layer, are known as common black films.…”

Section: Discussionmentioning

confidence: 99%

A simulation study of the kinetics of passage of CO2 and N2 through the liquid/vapor interface of water

Somasundaram

Panhuis

Lynden‐Bell

et al. 1999

The Journal of Chemical Physics

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A spectroscopic study of the fullerene/metal interface in C 60 -Al multilayers AIP Conf. Proc. 442, 265 (1998) The rate of passage of molecules of carbon dioxide and nitrogen through the vapor-liquid interface of water at 300 K is studied by simulation. Previous work has established the form of the free energy profile which has a minimum when the solute molecule is on the surface and a barrier between this state and solution in the bulk liquid. In one set of simulations, trajectories were initiated in the gas phase. From these, the average lifetime of molecules in the surface is determined to be considerably longer than the inverse of the energy relaxation rate, so that the sticking coefficient is one and exiting molecules have no memory of their original velocities. However, most molecules do return to the gas phase rather than entering the bulk solution. The rate of passage of molecules over the free energy barrier is studied using the reactive flux method with trajectories initiated near the top of the barrier. The results for nitrogen, in particular, give a good plateau in the time-dependent transmission coefficient and hence a reliable rate constant. The results from these two sets of simulations are combined to give an effective interface width which is used to determine the permeability of thin water films. These results are compared to experimental permeabilities of thin Newton black soap films. The rate-determining step for solution in bulk water is not passage through the few Å ngstroms width of the interface we study, but rather the transport from the vicinity of the interface into the bulk over the larger distance scale of m.

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Section: Discussionmentioning

confidence: 99%

A simulation study of the kinetics of passage of CO2 and N2 through the liquid/vapor interface of water

Somasundaram

Panhuis

Lynden‐Bell

et al. 1999

The Journal of Chemical Physics

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show abstract

“…[15][16][17][18][19][20][21][22] The permeabilities measured in this way have been found to depend on different parameters: temperature, 16 gas and film composition. 18,20,21,[23][24][25][26][27] However, during the deflation of the bubble, the thickness of the soap film through which gas exchange takes place is neither homogeneous nor stationary. As the film permeability is largely controlled by the thickness of the film, it is extremely difficult to compare the measured permeability with models and to extract quantitative information such as molecular-scale contributions related to the interaction between monolayers and gas molecules.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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A mobile soap film, stabilized with tetradecyltrimethylammonium bromide (TTAB) or sodium dodecylsulfate (SDS) surfactants and deposited in the middle of a cylindrical tube separates the tube into two distinct gaseous compartments. The first compartment is filled with air while the second one contains a mixture of air and perfluorohexane (C 6 F 14 ), which is a fluorinated gas barely soluble in water. This soap film thus acts as a liquid semi-permeable membrane for gases equivalent to 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 soap 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 anti-clogging effect is observed with a permeability that systematically increases over time. Since the thickness of the film is constant over time, we attribute this to the possibility of adsorbing or desorbing fluorinated gas molecules on the liquid membrane. Indeed, the partial pressure of the fluorinated gas being 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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“…When the aqueous core thickness is low, the amphiphilic monolayers are adsorbed onto each other and steric forces stabilize the membrane. Fundamental studies on these membranes started in early 1980s [258][259][260][261][262][263] with subsequent gas permeability characteristics of the membranes being studied in detail to probe the interactions within the film. [264][265][266][267] The influence of the charge of the headgroup of the amphiphilic molecule, (i.e.…”

Section: Amphiphilic Assemblies For Novel Nanomembranesmentioning

confidence: 99%

Amphiphile nanoarchitectonics: from basic physical chemistry to advanced applications

Ramanathan

Shrestha

Mori

et al. 2013

Phys. Chem. Chem. Phys.

318

231

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Permeation of Gas Through Newton Black Films at Different Chain Length of Thesurfactant

Cited by 17 publications

References 13 publications

A simulation study of the kinetics of passage of CO2 and N2 through the liquid/vapor interface of water

A simulation study of the kinetics of passage of CO2 and N2 through the liquid/vapor interface of water

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

Amphiphile nanoarchitectonics: from basic physical chemistry to advanced applications

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