Article (Scientific journals)
Transitional bulk-solutal Marangoni instability in sessile drops
Darras, Alexis; Vandewalle, Nicolas; Lumay, Geoffroy
2018In Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 98 (6)
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Keywords :
Fluid dynamics; evaporation; Marangoni effects
Abstract :
[en] Evaporation of sessile droplets is a method to organize suspended particles on solid substrates. Many studies have demonstrated that Marangoni flows caused by surface adsorbed molecules or temperature gradients can strongly a ect the dried deposit. In the present paper, we show how transitional Marangoni instabilitiy can be triggered by bulk-diluted tensio-active ions. Thanks to PIV analysis, we identify four different flow stages. The transition between them can be understood by considering the competition between the Marangoni flow and the mass conservation flow, usually responsible for the coffee-ring pattern. We also demonstrate that the initial ionic concentration can select a coffee-ring pattern or a more homogeneous dried deposit.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Darras, Alexis ;  Université de Liège - ULiège > Département de physique > Physique expér. de la matière molle et des syst. complexes
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Lumay, Geoffroy ;  Université de Liège - ULiège > Département de physique > Physique expér. de la matière molle et des syst. complexes
Language :
English
Title :
Transitional bulk-solutal Marangoni instability in sessile drops
Publication date :
December 2018
Journal title :
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
ISSN :
1539-3755
eISSN :
1550-2376
Publisher :
American Physical Society, United States - Maryland
Volume :
98
Issue :
6
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
ULiège - University of Liège [BE]
Funding text :
University of Liège (Starting Grant C-13/88)
Available on ORBi :
since 17 December 2018

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