How Slippery are SLIPS? Measuring Effective Slip on Lubricated Surfaces with Colloidal Probe Atmoc Force Microscopy

Scarratt, Liam R. J.; Zhu, Liwen

doi:10.1021/acs.langmuir.8b03767

Cited by 42 publications

(54 citation statements)

References 60 publications

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“…(i) This effect is expected to be nanoscale, as suggested by molecular dynamics simulations [28][29][30] and experiments 14,15 , and not quantifiable with our experimental setup.…”

Section: Resultsmentioning

confidence: 79%

“…1e. Although the OTS and grafted-PDMS surfaces are hydrophobic with low contact angle hysteresis, they are not capable of reducing drag beyond the nanoscale 14 .…”

Section: Resultsmentioning

confidence: 99%

“…The larger the slip length b, the larger the reduction in frictional drag. Superhydrophobic 4,5 and lubricant-infused surfaces (LIS) [6][7][8] have been shown to reduce drag substantially [9][10][11][12][13][14][15] , which makes them attractive to reduce the energy required to drive flow. Drag reduction by these surfaces is explained with the reduced contact area between the solid and the fluid 9 , which results in an "apparent slip" of the flowing liquid of viscosity μ w over the air (in the case of superhydrophobic surfaces) or over a lubricant of lower viscosity μ o in LIS, compared to the case of a solid surface.…”

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confidence: 99%

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Nanobubbles explain the large slip observed on lubricant-infused surfaces

2022

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Lubricant-infused surfaces hold promise to reduce the huge frictional drag that slows down the flow of fluids at microscales. We show that infused Teflon wrinkled surfaces induce an effective slip length 50 times larger than expected based on the presence of the lubricant alone. This effect is particularly striking as it occurs even when the infused lubricant’s viscosity is several times higher than that of the flowing liquid. Crucially, the slip length increases with increasing air content in the water but is much higher than expected even in degassed and plain Milli-Q water. Imaging directly the immersed interface using a mapping technique based on atomic force microscopy meniscus force measurements reveals that the mechanism responsible for this huge slip is the nucleation of surface nanobubbles. Using a numerical model and the height and distribution of these surface nanobubbles, we can quantitatively explain the large fluid slip observed in these surfaces.

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“…(i) This effect is expected to be nanoscale, as suggested by molecular dynamics simulations [28][29][30] and experiments 14,15 , and not quantifiable with our experimental setup.…”

Section: Resultsmentioning

confidence: 79%

“…1e. Although the OTS and grafted-PDMS surfaces are hydrophobic with low contact angle hysteresis, they are not capable of reducing drag beyond the nanoscale 14 .…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Nanobubbles explain the large slip observed on lubricant-infused surfaces

2022

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“…In this study, we investigated the droplet dynamics at the macro-scale. Literature reports of the water-lubricant interfaces suggest there is an effective slip length (micro-or nano-scale) of the lubricant layer for the surface slipperiness 19,55,57 . It has been reported that S-PDMS can have a thicker effective slip length as compared with similar LIS surfaces, thereby reflecting its greater slipperiness 19 .…”

Section: Droplet Dynamics On Slippery Surfacementioning

confidence: 99%

Antiwetting and Antifouling Performances of Different Lubricant-Infused Slippery Surfaces

et al. 2020

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The concept of slippery lubricant-infused surfaces has shown promising potential in antifouling for controlling detrimental biofilm growth. In this study, non-toxic silicone oil was either impregnated into porous surface nanostructures, referred as liquid infused surface (LIS), or diffused into a polydimethylsiloxane (PDMS) matrix, referred to as a swollen PDMS (S-PDMS), making two kinds of slippery surfaces. The slippery lubricant layers have extremely low contact angle hysteresis and both slippery surfaces showed superior anti-wetting performances with droplets bouncing off or rolling transiently after impacting the surfaces. We further demonstrated that water droplets can remove dust from the slippery surfaces thus showing a "cleaning effect". Moreover, "coffee-ring" effects were inhibited on these slippery surfaces after droplet evaporation, and deposits could be easily removed. The clinically biofilm-forming species P. aeruginosa (as a model system) was used to further evaluate the antifouling potential of the slippery surfaces. The dried biofilm stains could still be easily removed from the slippery surfaces. Additionally, both slippery surfaces prevented around 90% of bacterial biofilm growth after 6 days, compared to the unmodified control PDMS surfaces. This investigation also extended across another clinical pathogen, S. epidermidis, and showed similar results. The anti-wetting and anti-fouling analysis in this study will facilitate the development of more efficient slippery platforms for controlling biofouling.

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“…compromises the repellency of liquid‐infused surfaces. [ 9,30–32 ] To maintain the liquid overlayer on infused surfaces, two different strategies are prevalent in the literature—“liquid retention” and “liquid restoration”. Using a retention‐based strategy, the liquid overlayer is stabilized through a combination of chemical interactions and capillary forces with a roughened, chemically‐compatible substrate; liquid‐infused surfaces using this strategy are referred to as slippery liquid‐infused porous surfaces (SLIPS) and can be directly manufactured on metallic, ceramic, and polymer surfaces.…”

Section: Introductionmentioning

confidence: 99%

Self‐Stratifying Porous Silicones with Enhanced Liquid Infusion and Protective Skin Layer for Biofouling Prevention

Vena

Kolle

Stafslien

et al. 2020

Adv Materials Inter

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Liquid‐infused silicones are a promising solution for common surface adhesion problems, such as ice accumulation and biofilm formation, yet they generally lack the tunability, mechanical durability and/or longevity essential for industrial applications. Self‐stratifying porous silicones (SPS) infused with compatible silicone oil are developed as a passive strategy to address these shortcomings. Through emulsion templating, porosity is formed in the bulk polymer, providing increased free volume for oil infusion, while a non‐porous skin layer is formed at the surface. The bulk porosity and pore size distribution of SPS are independently controlled by varying water and surfactant concentration respectively, leading to a higher volume of oil infusion and improved oil retention relative to an unmodified silicone. Despite a higher oil loading and bulk porosity, the skin layer provides liquid‐infused SPS with a comparable surface elasticity to liquid‐infused silicones. The potential of liquid‐infused SPS as a nontoxic fouling release coating for marine applications is demonstrated using laboratory assays against a variety of soft and hard fouling organisms.

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How Slippery are SLIPS? Measuring Effective Slip on Lubricated Surfaces with Colloidal Probe Atmoc Force Microscopy

Cited by 42 publications

References 60 publications

Nanobubbles explain the large slip observed on lubricant-infused surfaces

Nanobubbles explain the large slip observed on lubricant-infused surfaces

Antiwetting and Antifouling Performances of Different Lubricant-Infused Slippery Surfaces

Self‐Stratifying Porous Silicones with Enhanced Liquid Infusion and Protective Skin Layer for Biofouling Prevention

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