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Rapid Spreading of a Droplet on a Thin Soap Film

Author(s): Motaghian, M; Shirsavar, R; Erfanifam, M; Sabouhi, M; Van Der Linden, E; et al

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Abstract: We study the spreading of a droplet of surfactant solution on a thin suspended soap film as a function of dynamic surface tension and volume of the droplet. Radial growth of the leading edge (R) shows power-law dependence on time with exponents ranging roughly from 0.1 to 1 for different surface tension differences (Δσ) between the film and the droplet. When the surface tension of the droplet is lower than the surface tension of the film (Δσ > 0), we observe rapid spreading of the droplet with R ≈ tα, where α (0.4 < α < 1) is highly dependent on Δσ. Balance arguments assuming the spreading process is driven by Marangoni stresses versus inertial stresses yield α = 2/3. When the surface tension difference does not favor spreading (Δσ < 0), spreading still occurs but is slow with 0.1 < α < 0.2. This phenomenon could be used for stretching droplets in 2D and modifying thin suspended films.
Publication Date: 2019
Citation: Motaghian, M, Shirsavar, R, Erfanifam, M, Sabouhi, M, Van Der Linden, E, Stone, HA, Bonn, D, Habibi, M. (2019). Rapid Spreading of a Droplet on a Thin Soap Film. Langmuir, 10.1021/acs.langmuir.9b02274
DOI: doi:10.1021/acs.langmuir.9b02274
Type of Material: Journal Article
Journal/Proceeding Title: Langmuir
Version: Final published version. This is an open access article.

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