[en] Evaporation of sessile droplets is a way to organize suspended particles and create surface coating.
Many studies have demonstrated that suspensions with various composition can give rise to
qualitatively different dried patterns, often by focusing on the radial density pro le of deposited
particles. We demonstrate that a single suspension of superparamagnetic colloids can give rise to
several dried patterns thanks to an external magnetic eld applied during the evaporation process.
We show the various patterns obtained with zero, constant, rotating and oscillating magnetic elds,
and evidence the continuous control given by the intensity of a constant magnetic eld. We also
show this magnetic control has a substantial e ect on the morphological details of the deposits.
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
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See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevE.98.062608 for rotating and oscillating magnetic field data and illustrative videos of the droplets' evaporation.
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