Electrolytes that Show a Transition to Bubble Coalescence Inhibition at High Concentrations

Christenson, Hugo K.; Bowen, R. E.; Carlton, J. A.; Denne, and J. R. M.; Lü, Yongjun

doi:10.1021/jp075440s

Cited by 78 publications

(72 citation statements)

References 23 publications

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“…The topic of electrogenerated bubbles has been investigated by many researchers, for example [88][89][90][91][92][93][94]. The behavior of bubbles on gas-evolving electrodes is of great interest because it significantly affects the mass transport.…”

Section: Mgso 4 -Based Inchworm Resultsmentioning

confidence: 99%

MEMS electrolytic inchworms for movable neural probe applications

Giacchino

Tai

2011

2011 IEEE 24th International Conference on Micro Electro Mechanical Systems

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Section: Mgso 4 -Based Inchworm Resultsmentioning

confidence: 99%

MEMS electrolytic inchworms for movable neural probe applications

Giacchino

Tai

2011

2011 IEEE 24th International Conference on Micro Electro Mechanical Systems

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“…It is noted that the disjoining pressure is crucial to understanding the behavior of drainage and rupture processes of surfactant and non-surfactant thin films. In addition, the understanding of the effects of specific ions on film-or bubble-related problems [40][41][42][43] also needs a better, more concise description for the tensions within these thin liquid films. By molecular simulation, it is possible to calculate the surface tension of bulk liquids, and also possible to calculate the surface tension of thin films (i.e., of smaller thickness).…”

Section: Disjoining Pressure Isothermsmentioning

confidence: 99%

Surface Interaction of Nanoscale Water Film with SDS from Computational Simulation and Film Thermodynamics

Peng

et al. 2017

Entropy

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Foam systems have been attracting extensive attention due to their importance in a variety of applications, e.g., in the cleaning industry, and in bubble flotation. In the context of flotation chemistry, flotation performance is strongly affected by bubble coalescence, which in turn relies significantly on the surface forces upon the liquid film between bubbles. Conventionally, unusual short-range strongly repulsive surface interactions for Newton black films (NBF) between two interfaces with thickness of less than 5 nm were not able to be incorporated into the available classical Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory. The non-DLVO interaction would increase exponentially with the decrease of film thickness, as it plays a crucial role in determining liquid film stability. However, its mechanism and origin are still unclear. In the present work, we investigate the surface interaction of free-standing sodium dodecyl-sulfate (SDS) nanoscale black films in terms of disjoining pressure using the molecular simulation method. The aqueous nanoscale film, consisting of a water coating with SDS surfactants, and with disjoining pressure and film tension of SDS-NBF as a function of film thickness, were quantitatively determined by a post-processing technique derived from film thermodynamics.

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“…The foaminess of ocean waves on the beach exemplifies the significant effect of salts in reducing bubble coalescence in nature. The experiments show that bubble coalescence can be significantly inhibited beyond a critical salt concentration, (also termed the transition concentration) (Christenson et al, 2008; . It is referred to as the critical concentration here because bubbles and liquid films undergo a transition from coalescence to non-coalescence at the critical moment when the opposing forces are balanced.…”

Section: Introductionmentioning

confidence: 99%

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

Firouzi¹

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Bubble coalescence and thin liquid films (TLFs) between bubbles known as foam films, are central to many daily activities, both natural and industrial. They govern a number of important processes such as foam fractionation, oil recovery from tar sands and mineral recovery by flotation using air bubbles. TLFs are known to be stabilized by some salts and bubble coalescence in saline water can be inhibited at salt concentrations above a critical (transition) concentration. However, the mechanisms of the inhibiting effect of these salts are as yet contentious. The aim of this work is to characterise the behaviour of saline liquid films both experimentally and theoretically to better understand the mechanisms.The effect of sodium halide and alkali metal salts including NaF, NaBr, NaI, NaCl, KCl and LiCl on the stability of a foam film was investigated by applying the TLF interferometry method. To mimic realistic conditions of bubble coalescence in separation processes, the drainage and stability of TLFs were studied under non-zero bubble (air-liquid interface) approach speeds (10-300 µm/s) utilizing a nano-pump. For each of the salts studied, a critical concentration (Ccr) above which liquid films lasted for up to 50 s depending on the salt type, concentration and the interface approach speed, was determined. For concentrations below Ccr, the saline liquid films either ruptured instantly or lasted for less than 0.2 s. Ccr follows the order NaF

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Electrolytes that Show a Transition to Bubble Coalescence Inhibition at High Concentrations

Cited by 78 publications

References 23 publications

MEMS electrolytic inchworms for movable neural probe applications

MEMS electrolytic inchworms for movable neural probe applications

Surface Interaction of Nanoscale Water Film with SDS from Computational Simulation and Film Thermodynamics

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

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