Fig. 6: Side view of the Marangoni transport process. | Nature Communications

Fig. 6: Side view of the Marangoni transport process.

From: Generation of Fermat’s spiral patterns by solutal Marangoni-driven coiling in an aqueous two-phase system

Fig. 6

a Schematic of apparatus used to capture the Marangoni convection and the spiral patterns formed by the deposition of a DEX-MB-CaCl2 (50 mM) droplet in a glass cuvette (24 × 24 × 24 mm) filled with PEG-SDBS (2.5 mM) solution (depth 2.5 mm). Cameras were fixed in the side and top directions to take movies beginning when the droplet was added to the bulk solution. b Coiling (side view) and spiral pattern formation (top view) subsequent to the deposition of the DEX-MB-CaCl2 droplet. PS particles (diameter 22 μm; red dots) were added to the solution to visualize the convection. c Asymmetric Marangoni convection around the filament (left) and the corresponding spiral patterns (right) at 152.8, 159.8, and 165.8 s. Peaks of the ω(t) curve occurred at those three times. The green lines are trajectories of the PS particles (diameter 22 μm; pink dots) over 5 s. White ovals indicate the direction of the Marangoni circulation.

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