Article (Scientific journals)
Combined effects of Marangoni, sedimentation and coffee-ring flows on evaporative deposits of superparamagnetic colloids
Darras, Alexis; Vandewalle, Nicolas; Lumay, Geoffroy
2019In Colloids and Interface Science Communications
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Abstract :
[en] Evaporation of sessile colloidal droplets is a way to organize suspended particles. It is already known that the composition of the surrounding fkuid modi es the dried deposit. For superparamagnetic particles, recent studies showed that external magnetic fi elds can act as remote controls for those deposits. In this paper, we study the confi guration space given by the interplay of such fi elds and a modi cation of the fluid composition by considering various concentrations of phosphate buffered saline (PBS). We show that the magnetic fi eld modifi es the morphological properties of the deposit, while the composition (i.e. PBS concentration) modifi es the density profi le of the deposit. We then present an explanation of these influences considering the competition between (i) sedimentation, (ii) coffee-ring and (iii) Marangoni flows. From these considerations, we propose a master curve which should be able to model the deposit densities of any system where the above mechanisms compete with each other.
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 :
Combined effects of Marangoni, sedimentation and coffee-ring flows on evaporative deposits of superparamagnetic colloids
Publication date :
September 2019
Journal title :
Colloids and Interface Science Communications
eISSN :
2215-0382
Publisher :
Elsevier, Amsterdam, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 18 September 2019

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