Evaporation-Triggered Segregation of Sessile Binary Droplets

Yaxing Li, Pengyu Lv, Christian Diddens, Huanshu Tan, Herman Wijshoff, Michel Versluis, Detlef Lohse (Corresponding Author)

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Abstract

Droplet evaporation of multicomponent droplets is essential for various physiochemical applications, e.g. in inkjet printing, spray cooling and microfabrication. In this work, we observe and study phase segregation of an evaporating sessile binary droplet, consisting of a mixture of water and a surfactant-like liquid (1,2-hexanediol). The phase segregation (i.e., demixing) leads to a reduced water evaporation rate of the droplet and eventually the evaporation process ceases due to shielding of the water by the non-volatile 1,2-hexanediol. Visualizations of the flow field by particle image velocimetry and numerical simulations reveal that the timescale of water evaporation at the droplet rim is faster than that of the Marangoni flow, which originates from the surface tension difference between water and 1,2-hexanediol, eventually leading to segregation.
Original languageEnglish
Article number224501
JournalPhysical review letters
Volume120
Issue number22
DOIs
Publication statusPublished - 1 Jun 2018

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evaporation
water
evaporation rate
particle image velocimetry
rims
printing
sprayers
shielding
flow distribution
interfacial tension
surfactants
cooling
liquids
simulation

Cite this

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title = "Evaporation-Triggered Segregation of Sessile Binary Droplets",
abstract = "Droplet evaporation of multicomponent droplets is essential for various physiochemical applications, e.g. in inkjet printing, spray cooling and microfabrication. In this work, we observe and study phase segregation of an evaporating sessile binary droplet, consisting of a mixture of water and a surfactant-like liquid (1,2-hexanediol). The phase segregation (i.e., demixing) leads to a reduced water evaporation rate of the droplet and eventually the evaporation process ceases due to shielding of the water by the non-volatile 1,2-hexanediol. Visualizations of the flow field by particle image velocimetry and numerical simulations reveal that the timescale of water evaporation at the droplet rim is faster than that of the Marangoni flow, which originates from the surface tension difference between water and 1,2-hexanediol, eventually leading to segregation.",
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Evaporation-Triggered Segregation of Sessile Binary Droplets. / Li, Yaxing; Lv, Pengyu; Diddens, Christian; Tan, Huanshu; Wijshoff, Herman; Versluis, Michel; Lohse, Detlef (Corresponding Author).

In: Physical review letters, Vol. 120, No. 22, 224501, 01.06.2018.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Evaporation-Triggered Segregation of Sessile Binary Droplets

AU - Li, Yaxing

AU - Lv, Pengyu

AU - Diddens, Christian

AU - Tan, Huanshu

AU - Wijshoff, Herman

AU - Versluis, Michel

AU - Lohse, Detlef

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AB - Droplet evaporation of multicomponent droplets is essential for various physiochemical applications, e.g. in inkjet printing, spray cooling and microfabrication. In this work, we observe and study phase segregation of an evaporating sessile binary droplet, consisting of a mixture of water and a surfactant-like liquid (1,2-hexanediol). The phase segregation (i.e., demixing) leads to a reduced water evaporation rate of the droplet and eventually the evaporation process ceases due to shielding of the water by the non-volatile 1,2-hexanediol. Visualizations of the flow field by particle image velocimetry and numerical simulations reveal that the timescale of water evaporation at the droplet rim is faster than that of the Marangoni flow, which originates from the surface tension difference between water and 1,2-hexanediol, eventually leading to segregation.

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