Self-regulation of foam volume and bubble size during foaming via shear mixing

Politova, N.; Valkova, Zhulieta; Golemanov, Konstantin; Denkov, Nikolai

doi:10.1016/j.colsurfa.2017.12.006

Cited by 34 publications

(19 citation statements)

References 33 publications

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“…Note that we use a foaming method with very intensive mechanical agitation (Bartsch shaking test) and that many of the studied solutions are of relatively low surfactant concentration (below and around the CMC) -as a result, the bubble coalescence plays a crucial role for the volume of the foams studied. From this viewpoint, the current paper extends and complements our previous study [36] in which only the range of high surfactant concentration was investigated and the bubble coalescence was completely suppressed. The article is organized as follows: Section 2 describes the materials and methods used.…”

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confidence: 68%

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Foamability of aqueous solutions: Role of surfactant type and concentration

Petkova

Tcholakova

Chenkova

et al. 2020

Advances in Colloid and Interface Science

147

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In this paper we study the main surface characteristics which control the foamability of solutions of various surfactants. Systematic series of experiments with anionic, cationic and nonionic surfactants with different head groups and chain lengths are performed in a wide concentration range, from 0.001 mM to 100 mM. The electrolyte (NaCl) concentration is also varied from 0 up to 100 mM. For all surfactants studied, three regions in the dependence of the foamability, V A , on the logarithm of surfactant concentration, lgC S , are observed. In Region 1, V A is very low and depends weakly on C S . In Region 2, V A increases steeply with C S . In Region 3, V A reaches a plateau. To analyse these results, the dynamic and equilibrium surface tensions of the foamed solutions are measured. A key new element in our interpretation of the foaming data is that we use the surface tension measurements to determine the dependence of the main surface properties (surfactant adsorption, surface coverage and surface elasticity) on the surface age of the bubbles. In this way we interpret the results from the foaming tests by considering the properties of the dynamic adsorption layers, formed during foaming. The performed analysis reveals a large qualitative difference between the nonionic and ionic surfactants with respect to their foaming profiles. The data for the nonionic and ionic surfactants merge around two master curves when plotted as a function of the surface coverage, the surface mobility factor, or the Gibbs elasticity of the dynamic adsorption layers. This difference between the ionic and nonionic surfactants is explained with the important contribution of the electrostatic repulsion between the foam film surfaces for the ionic surfactants which stabilizes the dynamic foam films even at moderate surface coverage and at relatively high ionic strength (up to 100 mM). In contrast, the films formed from solutions of nonionic surfactants are stabilized via steric repulsion which becomes sufficiently high to prevent bubble coalescence only at rather high surface coverage (> 90 %) which corresponds to related high Gibbs elasticity (> 150 mN/m) and low surface mobility of the dynamic adsorption layers. Mechanistic explanations of all observed trends are provided and some important similarities and differences with the process of emulsification are outlined.

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confidence: 68%

“…Furthermore, in a later study [36] we showed that the higher viscoelasticity of the foam containing smaller bubbles may reduce the volume of the formed foam, thus suppressing the solution foamability. Thus we see that the effect of surface elasticity needs further clarification.…”

mentioning

confidence: 78%

Foamability of aqueous solutions: Role of surfactant type and concentration

Petkova

Tcholakova

Chenkova

et al. 2020

Advances in Colloid and Interface Science

147

View full text Add to dashboard Cite

show abstract

“…When the foaming agent is added to the liquid solution, the surface tension is reduced, which facilitates gas dispersion in the liquid phase. From a practical point of view, when choosing a product to use, good indicators are the ease of foamability, the high foam half-life of the foam, and the percentage of mass unloaded in different media at different temperatures with the exception of deionized water [25].…”

Section: Study Subject and Research Methodsmentioning

confidence: 99%

Study on the effect of cetyltrimethylammonium bromide on gas-liquid flow characteristics at low gas flow rates and gas pressure

et al. 2021

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Cenomanian gas deposits account for about 80% of natural gas production in Russia. Today, mature Cenomanian gas fields are depleted by more than 75% on average, the reservoir pressure in the productive formation zone has decreased by almost 90% compared to the initial pressure and in some places reaches 1.0-1.5 MPa. Reduction of pressure in the pay zone leads to active intrusion of water from the aquifer. The liquid is loading the well, and gas production decreases. The technology of gas well operation with foaming agent is widespread in the world, which is characterized by a high level of efficiency, including economic. The use of technology leads to a solution to the liquid loading and requires a preliminary selection of the optimal concentration of surfactants. The optimal concentration should ensure the creation of a relatively stable foam and provide a minimum pressure gradient in the production tubing. The article presents the results of studies of CTAB foaming agent influence on the process of liquid removal and pressure gradient in production tubing. Sequential studies to determine CMC, foamability, foam stability, and pressure gradient under foam flow were conducted on small-scale and large-scale facilities. These results can be reliable when using CTAB foaming agent, foaming agents based on it, or other cationic foaming agents in Cenomanian gas wells under the condition of reservoir water inflow. Besides, the effect of pressure on the optimal concentration of the foaming agent was also studied in this work.

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“…The aggregation of talc powder in the liquid film between bubbles formed a hard shell to protect bubbles, as shown in Figure 7. The hindrance between these hard shells obstructed the coalescence of bubbles (Barik and Roy, 2009;Politova et al, 2018). During the whole observation process, the shape of these bubbles remained unchanged and they were not easy to break.…”

Section: Talc Composite Foam Structurementioning

confidence: 99%

Study on Flame Retardancy and Mechanism of Talc Composite Foams

Guo

Qian³

2021

Front. Mater.

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Under high temperature, aqueous film forming foam extinguishing agent has poor flame retardancy and low fire efficiency. In order to solve this problem, talc was introduced into foam to form composite foam. The fire resistance and fire extinguishing properties of the composite foam were studied. The results showed that talc composite foam had good flame retardant resistance. when the concentration of talc reached 40 g/100 ml, the 50% liquid separation time of the composite foam was 21.1 min. The fuel burning in the anti burning tank did not ignite the gasoline in the oil pan, and burned out at 51.5 min. It was related to the structure of composite foam and the properties of talc. Due to the introduction of talc, the viscosity of the composite foam increased. The network structure of composite foam was important to the improved stability of foam. Talc powder formed a dense layer covering the oil surface, which effectively isolated the oil from the air.

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Self-regulation of foam volume and bubble size during foaming via shear mixing

Cited by 34 publications

References 33 publications

Foamability of aqueous solutions: Role of surfactant type and concentration

Foamability of aqueous solutions: Role of surfactant type and concentration

Study on the effect of cetyltrimethylammonium bromide on gas-liquid flow characteristics at low gas flow rates and gas pressure

Study on Flame Retardancy and Mechanism of Talc Composite Foams

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