Nanobubbles explain the large slip observed on lubricant-infused surfaces

Vega‐Sánchez, Christopher; Peppou-Chapman, Sam; Zhu, Liwen

doi:10.1038/s41467-022-28016-1

Cited by 50 publications

(78 citation statements)

References 57 publications

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“…Finally, although superhydrophobic surfaces have been extensively tested under conditions of flow (Table 5), only three studies have reported slip measurements in liquid‐infused surfaces using the pressure drop method (see Table 6 and ref. [ 26 ]).…”

Section: Discussionmentioning

confidence: 99%

“…Only three pressure drop measurements of slip have been reported so far on liquid‐infused surfaces as presented in Table 6 and ref. [ 26 ]. In these studies, the viscosity ratio between the working fluid and the infused liquid is a key factor in determining the effective slip provided by these surfaces.…”

Section: Theoretical Models and Experimental Measurements Of Slipmentioning

confidence: 99%

“…Nanoscale or microscale bubbles can be tolerated and are likely to increase the interfacial slip measured, given the low viscosity of the gas. [ 26 ] This is an issue that could be avoided using a syringe pump.…”

Section: Measurements Of Pressure Drop Versus Flow Ratementioning

confidence: 99%

“…Therefore, this review focuses on the assessment of the pressure drop versus flow rate method used to measure the slip boundary condition for flow in the laminar regime. Based on our own work [ 26 ] and previous works found in the literature, best practice procedures are identified, guidelines for the proper use of the method provided and strategies to improve its accuracy recommended.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Vega‐Sánchez

Neto

2021

Adv Materials Inter

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The correct theoretical definition of boundary conditions of flow underpins all fluid dynamics studies, and is particularly important in situations in which the flow is confined on the nano‐ and micro‐scale. Microfluidic devices are an excellent platform to measure boundary flow conditions, and the pressure drop versus flow rate method is particularly useful in detecting evidence of microscale interfacial slip and drag reduction. This review focuses on the pressure drop method, identifying the main experimental parameters affecting the accuracy and reproducibility of microfluidic experiments of slip, quantifying the magnitude and source of common errors, and providing practical solutions and guidelines. A summary of literature results of interfacial slip obtained with pressure drop measurements in microfluidic devices is also provided, and the slip results are directly compared to expected slip models. This review serves as an introduction for new researchers moving into the field of interfacial slip, and as reminder for established researchers of the need to create highly controlled experimental procedures in order to obtain reproducible and reliable measurements of boundary flow conditions. A direct comparison of accurate experiments with theoretical models is bound to bring about clarity about the mechanisms of slip on smooth and structured surfaces.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Models and Experimental Measurements Of Slipmentioning

confidence: 99%

Section: Measurements Of Pressure Drop Versus Flow Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Vega‐Sánchez

Neto

2021

Adv Materials Inter

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“…Understandings of in-droplet bubble formation may lay a foundation for exploring droplet reactions with enhanced chemical kinetics and hydrogen generation. Moreover, nanobubbles encapsulated in surface droplets may lead to a new pathway to functional slippery surfaces to reduce the surface friction, 45 porous surface-bound materials by templating nanobubbles, 46 or coated bubbles used in biomedical imaging, and therapeutic delivery of oxygen or other pharmaceutical compounds. 47,48 List of symbols Theoretical average growth rate of hydrogen bubbles nearing the droplet surface…”

Section: Discussionmentioning

confidence: 99%

Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets

Li¹,

Zeng²,

Zhang³

2022

Preprint

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Chemical reactions in small droplets are extensively explored to accelerate the discovery of new materials, increase efficiency and specificity in catalytic biphasic conversion and in high throughput analytic. In this work, we investigate the local rate of gas-evolution reaction within femtoliter droplets immobilized on a solid surface. The growth rate of hydrogen microbubbles (≥ 500 nm in radius) produced from the reaction was measured online by high-resolution confocal microscopic images. The growth rate of bubbles was faster in smaller droplets, and of bubbles near the three-phase boundary in the same droplet. The results were consistent for both pure and binary reacting droplets and on substrates of different wettability. Our theoretical analysis based on diffusion, chemical reaction and bubble growth in a steady state predicted that the concentration of the reactant diffusing from the surrounding depended on the droplet size and the bubble location inside the droplet, in good agreement with experimental results. Our results reveal that the reaction rate may be spatially non-uniform in the reacting microdroplets. The findings may have implications for formulating chemical properties and uses of these droplets.

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Theoretical Investigation of Capture, Collection, and Targeted Transfer of Underwater Gas Bubbles Using Janus‐Faced Carbon Cloth

et al. 2023

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Recently, a straightforward method for the preparation of a Janus carbon cloth (Janus‐CC) is reported. The method relies on polydimethylsiloxane (PDMS) coating, followed by flame exposure of one face of the PDMS‐coated CC. The nonexposed to the flame face of the Janus‐CC is superhydrophobic, while the exposed to the flame face is superhydrophilic. Underwater, the superhydrophobic face shows superaerophilicity, while the supherhydophilic face shows superaerophobicity. A tethered gas bubble onto the superhydrophobic face has a paraboloid of revolution shape due to the cohesion force between the bubble and the gaseous film. Herein, the geometrical parameters of underwater tethered gas bubbles onto the Janus‐CC are obtained, and the tendency of Janus‐CC for capturing of bubbles is interpreted based on the derived Gibbs free‐energy change equation. It is experimentally observed that a small sited bubble moves toward the bigger one through the formed gaseous film, but this observation cannot be interpreted based on the classical Young–Laplace equation because here the smaller bubble has bigger curvature radius. Herein, a modified Young–Laplace equation is derived and applied for interpretation of the movement of a small bubble toward the bigger one. Also, the buoyancy force for a sited bubble on the gaseous film is discussed.

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Nanobubbles explain the large slip observed on lubricant-infused surfaces

Cited by 50 publications

References 57 publications

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets

Theoretical Investigation of Capture, Collection, and Targeted Transfer of Underwater Gas Bubbles Using Janus‐Faced Carbon Cloth

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