Drying of sessile droplets of laponite-based aqueous nanofluids

[Display omitted] •The coffee-ring effect vanishes if concentration of laponite exceeds 5%.•Three-stage process is observed at low laponite concentrations.•The droplet mass and height are decreasing almost linearly. Formation of the ring-like pattern by nano-particles of the desiccated droplet of a...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2014-11, Vol.462, p.52-63
Main Authors: Lebovka, N.I., Gigiberiya, V.A., Lytvyn, O.S., Tarasevich, Yu.Yu, Vodolazskaya, I.V., Bondarenko, O.P.
Format: Article
Language:English
Subjects:
Coffee-ring effect
Colloids
Deposits
Desiccants
Desiccation
Droplets
Drying
Evaporation
Formations
Laponite
Mass conservation
Mathematical models
Modeling
Nanofluid
Nanofluids
Nanostructure
Sessile droplet
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Summary:[Display omitted] •The coffee-ring effect vanishes if concentration of laponite exceeds 5%.•Three-stage process is observed at low laponite concentrations.•The droplet mass and height are decreasing almost linearly. Formation of the ring-like pattern by nano-particles of the desiccated droplet of a laponite-based aqueous nanofluid (the well known ‘coffee-ring effect’) is studied. The temperature was controlled and fixed (T=300K). The laponite concentration was controlled and varied in order to investigate its effect on the pattern formation. It was observed that the coffee-ring effect vanishes if concentration of laponite exceeds 5%. A simple model for analysis of colloidal sessile droplet desiccation is proposed. The model describes correctly dynamics of the drying droplet profile and the final shape of the dried film (deposit). The model is based on the mass conservation law and reasonable assumption that deposit (gel phase) prevents the flows.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2014.08.014