Coalescence of surface bubbles: The crucial role of motion-induced dynamic adsorption layer

Zawała, Jan; Miguet, Jonas; Rastogi, Preetika; Atasi, Omer; Borkowski, Mariusz; Scheid, Benoît; Fuller, Gerald G.

doi:10.1016/j.cis.2023.102916

Cited by 8 publications

(3 citation statements)

References 78 publications

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“…Therein, with the bubble size increasing, the difference in V T gradually becomes larger, indicating that the air–water interface falls between mobile and immobile cases. This phenomenon can be attributed to the surfactant molecules migrating along the bubble surface under the action of fluid flow induced by bubble motion. , Certain areas of the upper bubble surface are free of surfactant adsorption. Following this, the uneven distribution of reagent along the air–water interface could result in Marangoni stress and prevent the adsorbed reagents from continuing rearrangement.…”

Section: Resultsmentioning

confidence: 99%

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble–Solid Surface Attachment and Implications for the Flotation of Fine Particles

Li,

Wang,

Manica

et al. 2024

Langmuir

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The flotation recovery of fine particles faces serious challenges due to the lack of kinetic energy required for supporting their radial displacement and attachment with bubbles. Generally, the hydrodynamic resistance and repulsive disjoining pressure successively inhibit the liquid outflow intervening between the bubble and solid surfaces. To quantitatively characterize the influence of the main repulsion on film thinning time, experiments have been designed in three different aqueous systems. Bubble surface mobility closely associated with hydrodynamic resistance was determined by the rising bubble technique, and the DLVO theory was employed to confirm the evolution of electrostatic repulsion. The film drainage process was then measured based on the high-speed microscopic interferometry. Furthermore, the influence of the main repulsion on bubble−solid surface interactions was examined by flotation recovery. Results show that the earlier buildup of hydrodynamic force ran through the whole film thinning process, and under immobile conditions, the central region gradually became dominant in film thinning due to the very limited fluid flow at the thinnest rim position. Therefore, to achieve the identical film thickness (∼100 nm), the large hydrodynamic resistance could prolong the film thinning time by about 1 order of magnitude, compared with that induced by electrostatic repulsion, which accounts for the increased flotation recovery by 10% using mobile bubbles. This study not only enhances the understanding of how typical repulsive forces work in film drainage dynamics but also opens up an avenue for enhancing flotation and avoiding wasting resources by modulating bubble surface mobility and thus micro/nanoscale fluid flow.

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Section: Resultsmentioning

confidence: 99%

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble–Solid Surface Attachment and Implications for the Flotation of Fine Particles

Li,

Wang,

Manica

et al. 2024

Langmuir

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“…At the same time, it is also found that ISF has problems of poor stability and weak accumulation capacity. Some researchers have tried to improve the stability of ISF by adding materials such as volcanic ash and fibers to cement. , However, this method has very limited stability improvement and cannot fundamentally solve the Ostwald ripening, , coalescence processes, − and gravity-driven drainage − of ISF. It has been shown that the physical and chemical properties of PF determine the size, distribution, and interconnection characteristics of bubbles in ISF .…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation of Inorganic Solidified Foam with High Stability and Its Prevention and Treatment of Coal Spontaneous Combustion

Zhao,

Sun,

et al. 2023

Energy Fuels

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In order to prevent coal spontaneous combustion, a highly stable inorganic solidified foam (XISF) suitable for the coal mine top-coal caving region, airtight partition wall, and ″two ends″ of working face was put forward. An ultrastable prefabricated foam (PF) was synthesized by modifying the gas−liquid interface with xanthan gum (XG). The influence of XG content on foam stability was studied by different techniques. In addition, XISF was synthesized by the prefabricated foam method using cement, fly ash, and other noncombustible inorganic materials as the matrix. The stability of PF indicated that the hydrogen bond structure induced by XG could effectively inhibit the Ostwald ripening, coalescence processes, and gravity-driven drainage of the foam. The stability of XISF indicated that when the content of XG was 0−0.3 wt %, the stability of the synthesized XISF increases with the increase of the content of XG. However, when the content of XG was 0.5 wt % (PF system), various active functional groups such as hydroxyl and carboxyl groups in XG chelated with Ca 2+ on the surface of cement particles, forming a ″shell−core″ structure that inhibits hydration. This structure destroys the stability provided by XG. The plugging air leakage test, accumulation diffusion test, and fire extinguishing test show that the improvement of stability was beneficial to improve the fire-preventing and extinguishing characteristic of XISF.

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“…Recent efforts have been made to study the dynamics of thin liquid films (TLFs) formed between free-rising air bubbles and rigid solid surfaces . Direct monitoring of the thickness profiles during the bouncing and impact of free-rising air bubbles and flat hydrophilic plates has been made possible recently. − The film thickness of the TLF was directly observed using the interferometry technique . Parkinson and Ralston monitored the drainage of TLFs when a tiny air bubble was rising against a flat surface, and the experimental data was compared with the modeling results using a force balance coupled with colloidal forces or DLVO forces .…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Investigation into Dynamics of Thin Liquid Films during Bouncing and Attachment of Rising Air Bubbles on Hydrophilic and Hydrophobic Surfaces

Hamidzadeh,

Huang,

et al. 2023

Langmuir

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Coalescence of surface bubbles: The crucial role of motion-induced dynamic adsorption layer

Cited by 8 publications

References 78 publications

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble–Solid Surface Attachment and Implications for the Flotation of Fine Particles

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble–Solid Surface Attachment and Implications for the Flotation of Fine Particles

Study on the Preparation of Inorganic Solidified Foam with High Stability and Its Prevention and Treatment of Coal Spontaneous Combustion

Nanoscale Investigation into Dynamics of Thin Liquid Films during Bouncing and Attachment of Rising Air Bubbles on Hydrophilic and Hydrophobic Surfaces

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