Increased evaporation kinetics of sessile droplets by using nanoparticles

Nguyen, Tuan A. H. and Nguyen, Anh V. (2012) Increased evaporation kinetics of sessile droplets by using nanoparticles. Langmuir, 28 49: 16725-16728. doi:10.1021/la303293w

Author Nguyen, Tuan A. H.
Nguyen, Anh V.
Title Increased evaporation kinetics of sessile droplets by using nanoparticles
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2012-12
Sub-type Article (original research)
DOI 10.1021/la303293w
Volume 28
Issue 49
Start page 16725
End page 16728
Total pages 4
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Abstract The effect of nanoparticles on the evaporation of a sessile droplet into air is still controversial. Unlike insoluble surfactants which reduce the droplet evaporation rate, here we show that the presence of nanoparticles and the increase of their concentration lead to an increase in the overall rate of diffusive evaporation and, consequently, a decrease of the droplet lifetime. The nanoparticles accumulating at the droplet edge due to the well-known coffee-ring effect pin the three-phase contact line for an extended time and maintain a large air–water interface area, leading to the increased evaporation rate. We provide a full analytical prediction for the lifetime of a sessile droplet evaporating by the combined pinned-receding mode. A master equation and a master diagram for the droplet lifetime of the combined mode are obtained and experimentally validated, and explain the effect of nanoparticles on increasing the global evaporation rate and decreasing the droplet lifetime.
Keyword Liquid-drops
Still air
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 24 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 24 times in Scopus Article | Citations
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