Suppression of coffee ring: (Particle) size matters

Coffee ring patterns in drying sessile droplets are undesirable in various practical applications. Here, we experimentally demonstrate that on hydrophobic substrates, the coffee ring can be suppressed just by increasing the particle diameter. Particles with larger size flocculate within the evaporat...

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Veröffentlicht in:	Applied physics letters 2018-05, Vol.112 (21)
Hauptverfasser:	Bansal, Lalit, Seth, Pranjal, Murugappan, Bhubesh, Basu, Saptarshi
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Sprache:	eng
Schlagworte:	Applied physics Coffee Drying Flocculation Gravimetry Internal flow Substrates
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container_title	Applied physics letters
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creator	Bansal, Lalit Seth, Pranjal Murugappan, Bhubesh Basu, Saptarshi
description	Coffee ring patterns in drying sessile droplets are undesirable in various practical applications. Here, we experimentally demonstrate that on hydrophobic substrates, the coffee ring can be suppressed just by increasing the particle diameter. Particles with larger size flocculate within the evaporation timescale, leading to a significant gravimetric settling (for Pe > 1) triggering a uniform deposit. Interestingly, the transition to a uniform deposit is found to be independent of the internal flow field and substrate properties. Flocculation of particles also alters the particle packing at the nanoscale resulting in order to disorder transitions. In this letter, we exhibit a physical exposition on how particle size affects morphodynamics of the droplet drying at macro-nano length scales.
doi_str_mv	10.1063/1.5034119
format	Article
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subjects	Applied physics Coffee Drying Flocculation Gravimetry Internal flow Substrates
title	Suppression of coffee ring: (Particle) size matters
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