A novel physical mechanism of liquid flow slippage on a solid surface

Kurotani, Yuji; Tanaka, Hajime

doi:10.1126/sciadv.aaz0504

Cited by 29 publications

(14 citation statements)

References 73 publications

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“…4). Further, it has been reported that flow increases the rate of growth of nanobubbles on superhydrophobic surfaces 53,54 . On LIS, higher flow rates increase the portions of exposed areas of the Teflon substrate to the water and, therefore, we expect that higher flow also increases nucleation site density.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

Nanobubbles explain the large slip observed on lubricant-infused surfaces

2022

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“…The Young’s contact angle is typically used as measure of wettability and represents the balance of the three interfacial tensions at the three-phase contact line:

This contact angle can strongly affect the formation and behavior of droplets. For example, the density fluctuation of liquids increases in the vicinity of a solid substrate, which allows droplets to nucleate more easily on wetting substrates compared with nonwetting substrates ( Kalikmanov, 2013 ; Kurotani and Tanaka, 2020 ). Wettability is therefore a key determinant of droplet formation and behavior on a substrate.…”

Section: Three States Of Droplet-surface Interactions: Complete Wetti...mentioning

confidence: 99%

Intracellular wetting mediates contacts between liquid compartments and membrane-bound organelles

Kusumaatmaja

May

Knorr

2021

Journal of Cell Biology

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Protein-rich droplets, such as stress granules, P-bodies, and the nucleolus, perform diverse and specialized cellular functions. Recent evidence has shown the droplets, which are also known as biomolecular condensates or membrane-less compartments, form by phase separation. Many droplets also contact membrane-bound organelles, thereby functioning in development, intracellular degradation, and organization. These underappreciated interactions have major implications for our fundamental understanding of cells. Starting with a brief introduction to wetting phenomena, we summarize recent progress in the emerging field of droplet–membrane contact. We describe the physical mechanism of droplet–membrane interactions, discuss how these interactions remodel droplets and membranes, and introduce "membrane scaffolding" by liquids as a novel reshaping mechanism, thereby demonstrating that droplet–membrane interactions are elastic wetting phenomena. “Membrane-less” and “membrane-bound” condensates likely represent distinct wetting states that together link phase separation with mechanosensitivity and explain key structures observed during embryogenesis, during autophagy, and at synapses. We therefore contend that droplet wetting on membranes provides a robust and intricate means of intracellular organization.

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“…46,47 Because of the oversaturation region around gas bubbles, the mass transfer of gas molecule across the liquid-gas interface behaved as the limiting step in gas bubble's shrinkage and growth. 48 In order to clarify the origin of the prolonged lifetime, the surface bubble lifetime (tb) was deduced according to an equilibrium between the oversaturation pressure and Laplace pressure (Eq. 1, and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Single Particle Hopping as an Indicator for Evaluating Electrocatalysts

et al. 2022

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Design and screening electrocatalysts for gas evolution reactions suffer from scanty understanding of multi-phase processes at the electrode-electrolyte interface. Due to the complexity of multi-phase interface, it is still a great challenge to capture gas evolution dynamics under operando condition to precisely portray the intrinsic catalytic performance of interface. Here, we establish a single particle imaging method to real time monitor a potentialdependent vertical motion or hopping of electrocatalysts induced by electrogenerated gas nanobubbles. The hopping feature of single particle is closely correlated with intrinsic activities of electrocatalysts, thus is developed to be an indicator to evaluate gas evolution performance of various electrocatalysts. This optical indicator diminishes interferences from heterogeneous morphologies, non-Faradaic processes and parasitic side reactions that are unavoidable in conventional electrochemical measurements, therefore enables precise evaluation and highthroughput screening of catalysts for gas evolution systems.

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A novel physical mechanism of liquid flow slippage on a solid surface

Cited by 29 publications

References 73 publications

Nanobubbles explain the large slip observed on lubricant-infused surfaces

Nanobubbles explain the large slip observed on lubricant-infused surfaces

Intracellular wetting mediates contacts between liquid compartments and membrane-bound organelles

Single Particle Hopping as an Indicator for Evaluating Electrocatalysts

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