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HERO ID
4674225
Reference Type
Journal Article
Title
Evaporation-Triggered Segregation of Sessile Binary Droplets
Author(s)
Li, Y; Lv, P; Diddens, C; Tan, H; Wijshoff, H; Versluis, M; Lohse, D
Year
2018
Is Peer Reviewed?
1
Journal
Physical Review Letters
ISSN:
0031-9007
EISSN:
1079-7114
Volume
120
Issue
22
Page Numbers
224501
Language
English
PMID
29906161
DOI
10.1103/PhysRevLett.120.224501
Web of Science Id
WOS:000434020200017
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 the phase segregation of an evaporating sessile binary droplet, consisting of a miscible mixture of water and a surfactantlike 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 nonvolatile 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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1,2-Hexanediol
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