Sink dynamics of aqueous drops on lubricating fluid coated hydrophilic surfaces

Meenaxi Sharma; Pritam Kumar Roy; Reeta Pant; Krishnacharya Khare

doi:10.1016/j.colsurfa.2018.11.048

Sink dynamics of aqueous drops on lubricating fluid coated hydrophilic surfaces

Meenaxi Sharma, Pritam Kumar Roy, Reeta Pant, Krishnacharya Khare

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

15 Scopus citations

Abstract

Slippery behavior of aqueous drops on lubricating oil coated solid surfaces depends strongly on the wettability of the solid substrates. Stable slippery behavior is observed, with floating aqueous drops, if underneath solid substrates are hydrophobic. For hydrophilic surfaces, lubricating oil film underneath an aqueous drop becomes unstable and ruptures due to attractive van der Waals interaction, leading to sinking of the aqueous drop. Here, we report the sinking behavior of aqueous drops on thin lubricating oil coated hydrophobic and hydrophilic surfaces. The sinking behavior of aqueous drops is analyzed in terms of change in the apparent contact angle with time. The sink time of drops depends on both the wettability of the substrate as well as viscosity of the lubricating layer, while the final apparent contact angle depends only on wettability.

Original language	English
Pages (from-to)	377-382
Number of pages	6
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	562
DOIs	https://doi.org/10.1016/j.colsurfa.2018.11.048
State	Published - 5 Feb 2019
Externally published	Yes

Bibliographical note

Funding Information:
This research work was supported by Hindustan Unilever Limited, India and DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

Liquid-liquid interface
Lubricant
Sinking
Viscosity
Wetting

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10.1016/j.colsurfa.2018.11.048

Cite this

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abstract = "Slippery behavior of aqueous drops on lubricating oil coated solid surfaces depends strongly on the wettability of the solid substrates. Stable slippery behavior is observed, with floating aqueous drops, if underneath solid substrates are hydrophobic. For hydrophilic surfaces, lubricating oil film underneath an aqueous drop becomes unstable and ruptures due to attractive van der Waals interaction, leading to sinking of the aqueous drop. Here, we report the sinking behavior of aqueous drops on thin lubricating oil coated hydrophobic and hydrophilic surfaces. The sinking behavior of aqueous drops is analyzed in terms of change in the apparent contact angle with time. The sink time of drops depends on both the wettability of the substrate as well as viscosity of the lubricating layer, while the final apparent contact angle depends only on wettability.",

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AU - Pant, Reeta

AU - Khare, Krishnacharya

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N2 - Slippery behavior of aqueous drops on lubricating oil coated solid surfaces depends strongly on the wettability of the solid substrates. Stable slippery behavior is observed, with floating aqueous drops, if underneath solid substrates are hydrophobic. For hydrophilic surfaces, lubricating oil film underneath an aqueous drop becomes unstable and ruptures due to attractive van der Waals interaction, leading to sinking of the aqueous drop. Here, we report the sinking behavior of aqueous drops on thin lubricating oil coated hydrophobic and hydrophilic surfaces. The sinking behavior of aqueous drops is analyzed in terms of change in the apparent contact angle with time. The sink time of drops depends on both the wettability of the substrate as well as viscosity of the lubricating layer, while the final apparent contact angle depends only on wettability.

AB - Slippery behavior of aqueous drops on lubricating oil coated solid surfaces depends strongly on the wettability of the solid substrates. Stable slippery behavior is observed, with floating aqueous drops, if underneath solid substrates are hydrophobic. For hydrophilic surfaces, lubricating oil film underneath an aqueous drop becomes unstable and ruptures due to attractive van der Waals interaction, leading to sinking of the aqueous drop. Here, we report the sinking behavior of aqueous drops on thin lubricating oil coated hydrophobic and hydrophilic surfaces. The sinking behavior of aqueous drops is analyzed in terms of change in the apparent contact angle with time. The sink time of drops depends on both the wettability of the substrate as well as viscosity of the lubricating layer, while the final apparent contact angle depends only on wettability.

KW - Liquid-liquid interface

KW - Lubricant

KW - Sinking

KW - Viscosity

KW - Wetting

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Sink dynamics of aqueous drops on lubricating fluid coated hydrophilic surfaces

Abstract

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Keywords

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