Dewetting of non-polar thin lubricating films underneath polar liquid drops on slippery surfaces

Bhatt, Bidisha; Gupta, Shivam; Sharma, Manish; Khare, Krishnacharya

doi:10.1016/j.jcis.2021.08.211

Cited by 8 publications

(16 citation statements)

References 40 publications

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“…[ 30 ] The incomplete fluorination of the silicon leads to unstable lubricant layers on the TLP, which can spontaneously dewet from the substrate when a water droplet is placed on the lubricant. [ 31 ] This can manifest in droplet pinning, as demonstrated by the samples produced at 20% RH. This implies lower lubricant stability potentially leading to reduced anti‐fouling and anti‐thrombotic performance.…”

Section: Resultsmentioning

confidence: 98%

“…[ 2b,6 ] Conversely, low surface energy substrates such as those with denser fluorine surface coverage are expected to better stabilize the lubricant films. [ 31a ]…”

Section: Resultsmentioning

confidence: 99%

“…The results point to an incomplete or defective, patchy surface coverage and/or a very thin TP layer. This can lead to exposure of the underlying silica and spontaneous dewetting of the lubricant which causes droplet pinning, [ 31a ] when the CVD process is conducted in nonsealed containers.…”

Section: Resultsmentioning

confidence: 99%

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Design Optimization of Perfluorinated Liquid‐Infused Surfaces for Blood‐Contacting Applications

Hong

Mathur

Ruhoff

et al. 2022

Adv Materials Inter

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Tethered‐liquid perfluorocarbon (TLP) coatings show promise for blood‐contacting medical device applications to reduce blood adhesion and delay thrombosis. However, their fabrication and longevity under external fluid flow is not well characterized. A vapor phase silanization reaction leading to the formation of tethered‐perfluorocarbon (TP) layers containing large bumpy aggregates, 300 ± 200 nm thick, on top of an underlying 35 ± 15 nm thick uniform coating is reported. The vapor phase method compares favorably to the well‐established liquid phase deposition to reproducibly create slippery coatings on silicon and polystyrene with very low water sliding angles (2° ± 1°), without the need to control humidity conditions. The TP layer retains perfluorinated lubricants up to 20 000 s–1, using a cone‐and‐plate rheometer, with the higher viscosity lubricant perfluoroperhydrophenanthrene being more resistant to depletion than perfluorodecalin. TLP infused with either of the lubricants effectively reduces adhesion of fibrin from human whole blood relative to TP and control hydrophilic and hydrophobic surfaces. The combination of highly fluorinated TP coatings grafted from the vapor phase to create nanoscale structured surfaces infused with higher viscosity lubricant may be the most suitable combination for clinical applications of liquid‐infused surfaces to reduce thrombosis in blood‐contacting medical devices under flow.

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Section: Resultsmentioning

confidence: 98%

“…[ 2b,6 ] Conversely, low surface energy substrates such as those with denser fluorine surface coverage are expected to better stabilize the lubricant films. [ 31a ]…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Design Optimization of Perfluorinated Liquid‐Infused Surfaces for Blood‐Contacting Applications

Hong

Mathur

Ruhoff

et al. 2022

Adv Materials Inter

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“…to 400(±100) nm due to hydrodynamic squeezing after depositing aqueous drops, 37,39 which finally undergo dewetting. At a voltage smaller than 10 V, the dewetting time becomes very large and the value of λ m also diverges, so performing the dewetting dynamics experiments becomes challenging.…”

Section: Resultsmentioning

confidence: 99%

“…solid surface, lubricating fluid, and test liquid. [37][38][39] In this article, we demonstrate the electric field controlled reversible dewetting of thin lubricating films underneath aqueous drops on stable slippery surfaces over multiple cycles. film can be made unstable upon applying an external electric field across the dielectric lubricating film.…”

Section: Introductionmentioning

confidence: 99%

Reversible Dewetting of Thin Lubricating Films Underneath Aqueous Drops Using External Electric Field

Bhatt¹,

Gupta²,

Sumathi³

et al. 2022

Preprint

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The stability of thin liquid films on a surface depends on the excess free energy of the system involving various short-range and long-range interactions. In an unstable condition, thin liquid films may dewet into multiple small-sized droplets via spinodal, homogeneous, or heterogeneous nucleation process. However, if the total excess free energy of the system can be manipulated using an external stimulus, one can control the stability of thin liquid films on demand. Here, we study the reversible dewetting process of thin lubricating films underneath aqueous drops on slippery surfaces using an external electric field. Upon applying voltage, stable thin lubricating films dewet in a manner identical to the spinodal dewetting of nanometer-thick liquid films. Upon removing the applied voltage, the dewetted droplets spread, coalesce with neighboring ones, and form a uniform film again, however the time taken during rewetting is very different compared to dewetting. The characteristic features of both the dewetting and rewetting processes are present over multiple cycles. Due to the random nature of the 1

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Electric Field Driven Reversible Spinodal Dewetting of Thin Liquid Films on Slippery Surfaces

Bhatt

Gupta

Sumathi

et al. 2023

Adv Materials Inter

Self Cite

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The stability of thin liquid films on a surface depends on the excess free energy of the system involving various short‐range and long‐range interactions. When forced to wet an unfavorable surface, thin liquid films dewet into multiple small‐sized droplets via spinodal, homogeneous, or heterogeneous nucleation process. However, if the total excess free energy of the system can be manipulated using external stimuli, for example, electric field, temperature, or light, one can control the stability of thin liquid films on demand. Here the electric‐field induced reversible dewetting and rewetting of thin liquid films underneath aqueous drops on slippery surfaces is studied. Upon applying voltage, hundreds of nanometer thick stable liquid films dewet in a manner identical to the spinodal dewetting of few nanometer‐thick liquid films following the linear stability analysis. Upon removing the applied voltage, the dewetted droplets spread, coalesce with neighboring ones, and form a uniform film again, albeit taking significantly longer times. The characteristic features defined via spatial and temporal evolution of the dewetting and rewetting processes are present over multiple cycles suggesting the complete reversibility of the process.

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Dewetting of non-polar thin lubricating films underneath polar liquid drops on slippery surfaces

Cited by 8 publications

References 40 publications

Design Optimization of Perfluorinated Liquid‐Infused Surfaces for Blood‐Contacting Applications

Design Optimization of Perfluorinated Liquid‐Infused Surfaces for Blood‐Contacting Applications

Reversible Dewetting of Thin Lubricating Films Underneath Aqueous Drops Using External Electric Field

Electric Field Driven Reversible Spinodal Dewetting of Thin Liquid Films on Slippery Surfaces

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