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Viscoelastic Particle-Laden Interface Inhibits Coffee-Ring Formation
Muraleedharapai Mayarani, ,
Published in American Chemical Society
2018
PMID: 30383383
Volume: 34
   
Issue: 47
Pages: 14294 - 14301
Abstract
We investigate the evaporation-driven pattern formation in drying drops containing mixtures of polystyrene and soft microgel particles. The well-known coffee-rings that form when drops containing polystyrene particles are dried can be completely undone in the presence of a small quantity of soft colloids. The addition of soft colloids facilitates the adsorption of polystyrene particles to the water-vapor interface leading to a steep increase in their concentration and also imparts viscoelasticity to the interface. Time-resolved video microscopy is used to conclusively show the formation of a gel-like particle-laden interface. The mean square displacement of the polystyrene particles adsorbed to the interface confirms their immobile nature at the interface. This viscoelastic interface almost prevents the bulk flow-assisted migration of polystyrene particles toward the drop edge, leading to the suppression of coffee-ring effect and the formation of uniform particulate deposits. Copyright © 2018 American Chemical Society.
About the journal
JournalData powered by TypesetLangmuir
PublisherData powered by TypesetAmerican Chemical Society
ISSN07437463
Open AccessNo
Concepts (22)
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    Drops
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    Viscoelasticity
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    Mean square displacement
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    MICROGEL PARTICLES
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    PARTICLE-LADEN
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    Pattern formation
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    POLYSTYRENE PARTICLE
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    VIDEO MICROSCOPY
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    VISCOELASTIC INTERFACES
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    WATER-VAPOR INTERFACE
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    Polystyrenes
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    Acrylic acid resin
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    POLY-N-ISOPROPYLACRYLAMIDE
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    Polystyrene derivative
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    Chemistry
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    ELASTICITY
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    Surface property
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    Viscosity
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    WATER VAPOR
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    Acrylic resins
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    Steam
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    Surface properties