Kinetics of transfer of volatile amphiphiles (fragrances) from vapors to aqueous drops and vice versa: Interplay of diffusion and barrier mechanisms

Danov, Krassimir D.; Gurkov, Theodor D.; Stanimirova, Rumyana D.; Uzunova, Ralitsa I.

doi:10.1016/j.colsurfa.2021.126931

Cited by 6 publications

(25 citation statements)

References 52 publications

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“…Surface tension has been assessed under equilibrium conditions as well as under nonequilibrium fastadsorbing regimes with different measuring methods, including a comparison with the earlier data. 20,21 Volatile amphiphiles demonstrate a fast-adsorbing behavior so that with dynamic tensiometry, the maximal bubble pressure method, it is possible to assess both dynamic interfacial activity and quasisteady-state adsorption behavior in a single measurement on a time scale from milliseconds to seconds.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…In the regime of evaporation of a pendant drop (no instantaneous equilibrium conditions) at a time scale of minutes, the changes in the surface tension are defined by transport processes at both sides of the air−liquid interface, in agreement with the earlier studies. 21,29,30,33 It is shown that the rate-determining process depends both on the individual properties and on the concentration of aroma substances.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…These findings are in good agreement with the results of a more complex numerical analysis. 21 The derived individual mass transfer constant is envisaged to be used for the prediction of the interfacial behavior and, accordingly, for a targeted choice of volatile surfactants for specific applications.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…32 In the case of water-soluble volatile amphiphiles such as short carbon-chain n-alcohols, energy barriers for desorption or readsorption at the gas phase have been shown to be dissimilar to those at the liquid side of the interface, with the adsorption from the gas phase providing a dominant contribution. 30,33 Danov et al 21 reported an elegant study, when the surface of a pendant drop of pure water was saturated with aroma molecules in a closed atmosphere, resulting in a decrease in the surface tension of water up to a steady-state value. Then, the droplet was allowed to evaporate.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the opposite case of evaporation from the droplet, the analysis of the underlying mechanisms led to a conclusion that mass transfer dynamics is affected by the simultaneous evaporation of the solvent (water), which accelerates the desorption of benzyl acetate, while the desorption of linalool during the evaporation of the droplets is decelerated. However, the model reported by Danov et al 21 requires the adjustment of a full numerical solution for each individual system. Therefore, searching for a simplified phenomenological analysis of the instantaneous changes in the composition of the interfacial layer during evaporation, with the minimum number of fitting parameters, should help to solve the "structure−property" relationship of volatile amphiphiles, as well as assist in the selection of volatile surfactants for specific applications.…”

Section: ■ Introductionmentioning

confidence: 99%

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Volatile Aroma Surfactants: The Evaluation of the Adsorption–Evaporation Behavior under Dynamic and Equilibrium Conditions

et al. 2022

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Multicomponent heterogeneous systems containing volatile amphiphiles are relevant to the fields ranging from drug delivery to atmospheric science. Research presented here discloses the individual interfacial activity and adsorption–evaporation behavior of amphiphilic aroma molecules at the liquid–vapor interface. The surface tension of solutions of nonmicellar volatile surfactants linalool and benzyl acetate, fragrances as such, was compared with that of the conventional surfactant sodium dodecyl sulfate (SDS) under equilibrium as well as under no instantaneous equilibrium, including a fast-adsorbing regime. In open systems, the increase in the surface tension on a time scale of ∼10 min is evaluated using a phenomenological model. The derived characteristic mass transfer constant is shown to be specific to both the desorption mechanism and the chemistry of the volatile amphiphile. Fast-adsorbing behavior disclosed here, as well as the synergetic effect in the mixtures with conventional micellar surfactants, justifies the advantages of volatile amphiphiles as cosurfactants in dynamic interfacial processes. The demonstrated approach to derive specific material parameters of fragrance molecules can be used for an application-targeted selection of volatile cosurfactants, e.g., in emulsification and foaming, inkjet printing, microfluidics, spraying, and coating technologies.

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Section: ■ Conclusionmentioning

confidence: 99%