Quantification of particle–bubble interactions using atomic force microscopy: A review

Johnson, Daniel J.; Miles, N.J.; Hilal, Nidal

doi:10.1016/j.cis.2006.11.005

Cited by 81 publications

(45 citation statements)

References 91 publications

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“…That gas bubbles form strong capillary forces with particles at the gas-liquid-solid interface is known from theory, and forces have experimentally measured by atomic force microscopy [6][7][8]. The detachment process caused by air-bubbles involves interception, thinning of the liquid film, film rupture, formation of a threephase line, and stabilization of particle-bubble aggregates [2,9,10].…”

Section: Introductionmentioning

confidence: 98%

Detachment of colloids from a solid surface by a moving air–water interface

Sharma¹,

Flury²,

Zhou³

2008

Journal of Colloid and Interface Science

105

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Section: Introductionmentioning

confidence: 98%

Detachment of colloids from a solid surface by a moving air–water interface

Sharma¹,

Flury²,

Zhou³

2008

Journal of Colloid and Interface Science

105

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“…Studies on froth flotation have been focused on developing techniques to selectively modify mineral surface chemistry to improve the hydrophobicity and the attachment of particles to air bubbles [8][9][10][11][12][13][14][15], and on investigating the effect of bubble sizes [16,17] and hydrodynamic interaction [18,19], etc. The typical opinion is that the poor ability is due to the reduced particle hydrophobicity and hence less probability of particle/air attachment [20,21].…”

Section: Introductionmentioning

confidence: 99%

Modification of ilmenite surface chemistry for enhancing surfactants adsorption and bubble attachment

Fan

Waters

Rowson

et al. 2009

Journal of Colloid and Interface Science

100

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“…Attention has been given to the physics of bubble interactions at surfaces, including the bubble approach to the surface, the formation of the intervening water film, the kinetics of film thinning, the critical film thickness, the film's stability, the interaction forces and the disjoining pressure. [1][2][3][4][5][6][7][8][9][10] All these studies indicate that the structures of these water films differ from those of water in the bulk phase.…”

Section: Introductionmentioning

confidence: 99%

Molecular features of water films created with bubbles at silica surfaces

Wang

Yin

Nalaskowski

et al. 2015

Surface Innovations

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Sum frequency vibrational spectroscopy (SFVS) spectra indicate that a very ordered water structure exists in the stablewater film at a hydrophilic silica surface during contact with a bubble and that the extent of hydrogen bonding increases with an increase in contact pressure. In contrast, the SFVS spectra of water at a hydrophobic silica surface show a lack of hydrogen bonding and are characterized by a distinct absorption at about 3700 cm −1 , similar to the spectrum of the air/water interface. These results suggest the presence of a water exclusion zone at the hydrophobic surface, as supported by X-ray reflectivity measurements reported in the literature, by AFM images, and by results from molecular dynamics simulations. Of course, the water film at the hydrophobic surface is unstable with film thinning and rupture upon bubble contact. Under these circumstances, it is shown that an attractive van der Waals force between a bubble and the hydrophobic surface can be expected when the water exclusion zone is taken into consideration. As the thickness of the water exclusion zone increases to a thickness corresponding to the size of nanobubbles, the calculated attractive van der Waals force increases. This analysis may help to explain the so-called 'short-range' and 'long-range' hydrophobic forces. IntroductionThe interaction of bubbles with solid and liquid particles in aqueous systems is a fundamental phenomenon of interest in many areas of technology. These interactions are important in the development of improved flotation technologies for the recovery of valuable minerals, for water treatment, for wastepaper recycle, and so on. Flotation is accomplished by the attachment of air bubbles at the surface of hydrophobic particles and their separation from suspension, as practiced in the processing of mineral and energy resources. Attention has been given to the physics of bubble interactions at surfaces, including the bubble approach to the surface, the formation of the intervening water film, the kinetics of film thinning, the critical film thickness, the film's stability, the interaction forces and the disjoining pressure.1-10 All these studies indicate that the structures of these water films differ from those of water in the bulk phase.It has been established for silica surfaces that water films between a negatively charged bubble and the negatively charged silica surface are on the order of 100 nm in thickness. The films are stable at clean hydrophilic silica surfaces and metastable at methylated hydrophobic silica surfaces.1 These pioneering studies have

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Quantification of particle–bubble interactions using atomic force microscopy: A review

Cited by 81 publications

References 91 publications

Detachment of colloids from a solid surface by a moving air–water interface

Detachment of colloids from a solid surface by a moving air–water interface

Modification of ilmenite surface chemistry for enhancing surfactants adsorption and bubble attachment

Molecular features of water films created with bubbles at silica surfaces

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