Fig. 1: Thickness and concentration maps during film thinning.
From: Mapping out the interplay between surfactant induced forces in thin liquid films
a, b Set of representative images during the final stage of film thinning for an imposed pressure jump of ΔP = 250 Pa with NBD-PC surfactant with a) being typical for the stages, right after dimple wash-out and (b) in the regime of Common Black Film (CBF) formation. Columns correspond to: (a.1, b.1) Bright-field images, (a.2, b.2) recorded fluorescence intensity, and (a.3, b.3) corrected fluorescence intensity using Eq. (2) and scale directly with the in plane concentration in surfactants. Gray scale indicates normalized pixel intensity Ī. The interface equilibrium concentration is approximately Γeq = 1.32 ± 0.17 molecules.nm−2. The scale bar is defined in (a.1n) and is consistent throughout the figure.
