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

Yang Xiao, Neil M. Ribe (), Yage Zhang, Yi Pan, Yang Cao and Ho Cheung Shum ()
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Yang Xiao: The University of Hong Kong
Neil M. Ribe: Lab FAST, University Paris-Saclay, CNRS, Bât. 530, Campus Univ
Yage Zhang: The University of Hong Kong
Yi Pan: The University of Hong Kong
Yang Cao: The University of Hong Kong
Ho Cheung Shum: The University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The solutal Marangoni effect is attracting increasing interest because of its fundamental role in many isothermal directional transport processes in fluids, including the Marangoni-driven spreading on liquid surfaces or Marangoni convection within a liquid. Here we report a type of continuous Marangoni transport process resulting from Marangoni-driven spreading and Marangoni convection in an aqueous two-phase system. The interaction between a salt (CaCl2) and an anionic surfactant (sodium dodecylbenzenesulfonate) generates surface tension gradients, which drive the transport process. This Marangoni transport consists of the upward transfer of a filament from a droplet located at the bottom of a bulk solution, coiling of the filament near the surface, and formation of Fermat’s spiral patterns on the surface. The bottom-up coiling of the filament, driven by Marangoni convection, may inspire automatic fiber fabrication.

Date: 2022
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DOI: 10.1038/s41467-022-34368-5

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