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Rapid Spreading of a Droplet on a Thin Soap Film.

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 (??) between the film and the droplet. When the surface tension of the droplet is lower than the surface tension of the film (?? > 0), we observe rapid spreading of the droplet with R ? t?, where ? (0.4 < ? < 1) is highly dependent on ??. Balance arguments assuming the spreading process is driven by Marangoni stresses versus inertial stresses yield ? = 2/3. When the surface tension difference does not favor spreading (?? < 0), spreading still occurs but is slow with 0.1 < ? < 0.2. This phenomenon could be used for stretching droplets in 2D and modifying thin suspended films.

SUBMITTER: Motaghian M

PROVIDER: S-EPMC6868707 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Rapid Spreading of a Droplet on a Thin Soap Film.

Motaghian M M Shirsavar R R Erfanifam M M Sabouhi M M van der Linden E E Stone H A HA Bonn D D Habibi Mehdi M

Langmuir : the ACS journal of surfaces and colloids 20191106 46

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 < ...[more]

PMID: 31644302

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