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Peculiarities of Surfactant Extraction by a Droplet from its Homogeneous Solution

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Abstract

The process of surfactant extraction by a droplet from the surrounding homogeneous solution was studied experimentally via selecting the system of liquids in which the surfactant concentration in the droplet (upon completion of the diffusion) is many times higher than its initial concentration in the environment. It has been found that, under normal gravity, a significant concentration gradient is formed in the droplet, which results in the development of Marangoni convection, although an external gradient is absent. Visualization of flow patterns and concentration fields in the droplet and the environment made it possible to trace their evolution and to determine the conditions for occurrence of an oscillatory mass transfer regime. The results obtained demonstrate how the surfactant concentration and its vertical distribution vary vs. the droplet diameter, the initial surfactant concentration in the surrounding liquid and the time elapsed from the droplet formation.

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Funding

This work was supported by the Russian Science Foundation (Grant numbers 19–11-00133).

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Authors and Affiliations

  1. Institute of Continuous Media Mechanics UB RAS, Acad. Korolev Str. 1, 614013, Perm, Russia

    M. O. Denisova & K. G. Kostarev

  2. Perm National Research Polytechnic University, Komsomolsky Pr. 29, 614990, Perm, Russia

    M. O. Denisova & K. G. Kostarev

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  1. M. O. Denisova
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  2. K. G. Kostarev
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Contributions

Konstantin Gennadievich Kostarev designed the study. Maria Olegovna Denisova conducted experiments and analyzed the results under the guidance of Konstantin Gennadyevich Kostarev. Konstantin Gennadyevich Kostarev wrote the original manuscript. Both authors reviewed the manuscript.

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Correspondence to M. O. Denisova.

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Denisova, M.O., Kostarev, K.G. Peculiarities of Surfactant Extraction by a Droplet from its Homogeneous Solution. Microgravity Sci. Technol. 35, 29 (2023). https://doi.org/10.1007/s12217-023-10051-2

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