Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate

Nature Communications
F WodleiV Pimienta

Abstract

Drop motility at liquid surfaces is attracting growing interest because of its potential applications in microfluidics and artificial cell design. Here we report the unique highly ordered pattern that sets in when a millimeter-size drop of dichloromethane spreads on an aqueous substrate under the influence of surface tension, both phases containing a surfactant. Evaporation induces a Marangoni flow that forces the development of a marked rim at the periphery of the spreading film. At some point this rim breaks up, giving rise to a ring of droplets, which modifies the aqueous phase properties in such a way that the film recoils. The process repeats itself, yielding regular large-amplitude pulsations. Wrinkles form at the film surface due to an evaporative instability. During the dewetting stage, they emit equally spaced radial strings of droplets which, combined with those previously expelled from the rim, make the top view of the system resemble a flower.

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Citations

Nov 13, 2018·Soft Matter·Marcel MokbelKerstin Eckert
Feb 29, 2020·Physical Review Letters·Asher P MouatJustin C Burton
Sep 9, 2020·Soft Matter·Corentin Tregouet, Arnaud Saint-Jalmes
Sep 19, 2020·Physical Review. E·Takahiro TanabeNobuhiko J Suematsu
Aug 9, 2020·Scientific Reports·Patricia Pfeiffer, Claus-Dieter Ohl
Apr 2, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Zhanlong WangYa-Pu Zhao
Aug 10, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Nobuhiko J SuematsuShunsuke Izumi
Nov 18, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Wenjie JiDing Lan
Nov 4, 2021·Nature Communications·Bingqiang JiJie Feng
Dec 8, 2021·ACS Applied Materials & Interfaces·Siddharth ThakurDipankar Bandyopadhyay

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