Paradoxical coffee-stain effect driven by the Marangoni flow observed on oil-infused surfaces

Gilad Chaniel; Mark Frenkel; Victor Multanen; Edward Bormashenko

doi:10.1016/j.colsurfa.2017.03.009

Paradoxical coffee-stain effect driven by the Marangoni flow observed on oil-infused surfaces

Gilad Chaniel, Mark Frenkel, Victor Multanen, Edward Bormashenko

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Formation of coffee stain deposits under evaporation of droplets containing aqueous solution of salts placed on silicone-oil impregnated porous substrates was observed. The formation of ring-like deposits was registered for various molar concentrations of salts for the droplets of 5–300 μl in volume. The effect occurred when the contact line was de-pinned, and the evaporation from the edge of a droplet was stopped by the silicone oil. The formation of the coffee stain deposit is related to the soluto-capillary Marangoni flow; the influence of the thermo-capillary flow taking place in parallel is negligible.

Original language	English
Pages (from-to)	355-360
Number of pages	6
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	522
DOIs	https://doi.org/10.1016/j.colsurfa.2017.03.009
State	Published - 5 Jun 2017

Keywords

Coffee-stain deposit
Contact line
Evaporation
Marangoni flow
Oil-impregnated substrate

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10.1016/j.colsurfa.2017.03.009

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title = "Paradoxical coffee-stain effect driven by the Marangoni flow observed on oil-infused surfaces",

abstract = "Formation of coffee stain deposits under evaporation of droplets containing aqueous solution of salts placed on silicone-oil impregnated porous substrates was observed. The formation of ring-like deposits was registered for various molar concentrations of salts for the droplets of 5–300 μl in volume. The effect occurred when the contact line was de-pinned, and the evaporation from the edge of a droplet was stopped by the silicone oil. The formation of the coffee stain deposit is related to the soluto-capillary Marangoni flow; the influence of the thermo-capillary flow taking place in parallel is negligible.",

keywords = "Coffee-stain deposit, Contact line, Evaporation, Marangoni flow, Oil-impregnated substrate",

author = "Gilad Chaniel and Mark Frenkel and Victor Multanen and Edward Bormashenko",

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T1 - Paradoxical coffee-stain effect driven by the Marangoni flow observed on oil-infused surfaces

AU - Chaniel, Gilad

AU - Frenkel, Mark

AU - Multanen, Victor

AU - Bormashenko, Edward

PY - 2017/6/5

Y1 - 2017/6/5

N2 - Formation of coffee stain deposits under evaporation of droplets containing aqueous solution of salts placed on silicone-oil impregnated porous substrates was observed. The formation of ring-like deposits was registered for various molar concentrations of salts for the droplets of 5–300 μl in volume. The effect occurred when the contact line was de-pinned, and the evaporation from the edge of a droplet was stopped by the silicone oil. The formation of the coffee stain deposit is related to the soluto-capillary Marangoni flow; the influence of the thermo-capillary flow taking place in parallel is negligible.

AB - Formation of coffee stain deposits under evaporation of droplets containing aqueous solution of salts placed on silicone-oil impregnated porous substrates was observed. The formation of ring-like deposits was registered for various molar concentrations of salts for the droplets of 5–300 μl in volume. The effect occurred when the contact line was de-pinned, and the evaporation from the edge of a droplet was stopped by the silicone oil. The formation of the coffee stain deposit is related to the soluto-capillary Marangoni flow; the influence of the thermo-capillary flow taking place in parallel is negligible.

KW - Coffee-stain deposit

KW - Contact line

KW - Evaporation

KW - Marangoni flow

KW - Oil-impregnated substrate

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SN - 0927-7757

VL - 522

SP - 355

EP - 360

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

ER -

Paradoxical coffee-stain effect driven by the Marangoni flow observed on oil-infused surfaces

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Keywords

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