Unraveling the effects of gas species and surface wettability on the morphology of interfacial nanobubbles

Hu, Kadi; Luo, Liang; Sun, Xiaoming; Li, Hui

doi:10.1039/d2na00009a

Cited by 7 publications

(4 citation statements)

References 74 publications

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“…Molecular dynamics simulations have revealed that the gas inside nanobubbles exhibits ultrahigh density with a double-layer surface charge that counteracts the surface tension, which ultimately aids in the stabilization of nanobubbles [62]. Additionally, the high gas density and internal pressure of interfacial nanobubbles, along with their strong interfacial gas enrichment behavior, have been confirmed, further supporting the idea that nanobubbles can maintain high internal pressure [63]. Moreover, environments that confine gases to the nanoscale, such as solvents, can increase the solubility of gases such as H 2 , CH 4 , and C 2 H 6 [64].…”

Section: Effect Of Internal Pressure On Solubilitymentioning

confidence: 69%

Use of Nanobubbles to Improve Mass Transfer in Bioprocesses

Silva,

Arias-Torres,

Carlesi

et al. 2024

Processes

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Nanobubble technology has emerged as a transformative approach in bioprocessing, significantly enhancing mass-transfer efficiency for effective microbial activity. Characterized by their nanometric size and high internal pressure, nanobubbles possess distinct properties such as prolonged stability and minimal rise velocities, allowing them to remain suspended in liquid media for extended periods. These features are particularly beneficial in bioprocesses involving aerobic strains, where they help overcome common obstacles, such as increased culture viscosity and diffusion limitations, that traditionally impede efficient mass transfer. For instance, in an experimental setup, nanobubble aeration achieved 10% higher soluble chemical oxygen demand (sCOD) removal compared to traditional aeration methods. Additionally, nanobubble-aerated systems demonstrated a 55.03% increase in caproic acid concentration when supplemented with air nanobubble water, reaching up to 15.10 g/L. These results underscore the potential of nanobubble technology for optimizing bioprocess efficiency and sustainability. This review delineates the important role of the mass-transfer coefficient (kL) in evaluating these interactions and underscores the significance of nanobubbles in improving bioprocess efficiency. The integration of nanobubble technology in bioprocessing not only improves gas exchange and substrate utilization but also bolsters microbial growth and metabolic performance. The potential of nanobubble technology to improve the mass-transfer efficiency in biotechnological applications is supported by emerging research. However, to fully leverage these benefits, it is essential to conduct further empirical studies to specifically assess their impacts on bioprocess efficacy and scalability. Such research will provide the necessary data to validate the practical applications of nanobubbles and identify any limitations that need to be addressed in industrial settings.

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Section: Effect Of Internal Pressure On Solubilitymentioning

confidence: 69%

Use of Nanobubbles to Improve Mass Transfer in Bioprocesses

Silva,

Arias-Torres,

Carlesi

et al. 2024

Processes

View full text Add to dashboard Cite

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“…The Lennard-Jones (LJ) potential with a cutoff value of 12 Å was applied for the van der Waals interaction. Lorentz–Berthelot mixing rules were applied if the species were different, and LJ potential parameters were obtained from refs and − .…”

Section: Methodsmentioning

confidence: 99%

Nanoscale Patterning of Surface Nanobubbles by Focused Ion Beam

Siddique,

Xie,

Horlacher

et al. 2024

Langmuir

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Surface nanobubbles forming on hydrophobic surfaces in water present an exciting opportunity as potential agents of top-down and bottom-up nanopatterning. The formation and characteristics of surface nanobubbles are strongly influenced by the physical and chemical properties of the substrate. In this study, focused ion beam (FIB) milling is used for the first time to spatially control the nucleation of surface nanobubbles with 75 nm precision. The spontaneous formation of nanobubbles on alternating lines of a self-assembled monolayer (octadecyltrichlorosilane) patterned by FIB is detected by atomic force microscopy. The effect of chemical vs topographical surface heterogeneity on the formation of nanobubbles is investigated by comparing samples with OTS coating applied pre-vs post-FIB patterning. The results confirm that nanoscale FIB-based patterning can effectively control surface nanobubble position by means of chemical heterogeneity. The effect of FIB milling on nanobubble morphology and properties, including contact angle and gas oversaturation, is also reported. Molecular dynamics simulations provide further insight into the effects of FIB amorphization on surface nanobubble formation. Combined experimental and simulation investigations offer insights to guide future nanobubble-based patterning using FIB milling.

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“…Kinetic studies performed on HOPG electrodes in aqueous media reveal strong correlation of electrochemical rate constants with HOPG aging, which was found to slow down the reaction kinetic. − The contamination (“aging”) by airborne contaminants is known to decrease also the electrocatalytic activity of catalysts like Pt and Pd . Though gaseous composition of nanobubbles may influence their shape by pinning and contact angle as reported, e.g., Hu et al, pure atmospheric gases themselves are not responsible for the contamination effect. While numerous studies − report on gaseous nanodomains residing on a water-immersed HOPG surface, papers correlating their incidence with surface aging are scarce …”

Section: Introductionmentioning

confidence: 94%

Effect of Graphite Aging on Its Wetting Properties and Surface Blocking by Gaseous Nanodomains

Tarábková,

Janda

2023

Langmuir

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Early works considered basal planes of highly ordered pyrolytic graphite (HOPG) as hydrophobic, relatively inert materials with low electrocatalytic activity due to nonpolar sp 2 carbon. On the contrary, a freshly prepared HOPG surface exhibits intrinsically mildly hydrophilic properties, with a low contact angle of water, which increases after exposure to an ambient atmosphere. This process, called aging, ascribed to adsorption of airborne hydrocarbons, is reportedly accompanied by strong decay of electron transfer kinetics, the mechanism of which is not yet fully understood. Examining both freshly prepared and aged basal plane HOPG immersed in water by PeakForce quantitative nanomechanical imaging, we have found that aged HOPG is occupied by ambient gaseous nanodomains, the existence of which is explained by incomplete wetting. They cover up to 60% of the immersed surface and their incidence is in direct relation with graphite aging time. In contrast with aged graphite, gaseous nanodomains were absent on the freshly stripped HOPG surface. It can be concluded that ambient gaseous nanodomains can prevent aged basal plane HOPG from contact with aqueous media and may thus affect processes at the solid−liquid interface.

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Unraveling the effects of gas species and surface wettability on the morphology of interfacial nanobubbles

Abstract: Molecular dynamics simulations are performed to unravel the morphology dependence of interfacial nanobubbles on surface wettability and gas species.

Cited by 7 publications

References 74 publications

Use of Nanobubbles to Improve Mass Transfer in Bioprocesses

Use of Nanobubbles to Improve Mass Transfer in Bioprocesses

Nanoscale Patterning of Surface Nanobubbles by Focused Ion Beam

Effect of Graphite Aging on Its Wetting Properties and Surface Blocking by Gaseous Nanodomains

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