The Mechanism of Action of Antifoams

Abdolahi, Farzad; Moosavian, Ashkan; Vatani, Ali

doi:10.3923/jas.2005.1122.1129

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…With bridging stretching ( Fig 1B ), the oil particle bridges the foam film surface ( Fig 1B (a) and (b) ). This leads to the formation of an oil bridge which stretches over time, becoming an unstable film that ruptures at the thinnest region so that the entire foam structure is destroyed ( Fig 1B (c) and (d) )[ 3 , 28 ]. Mixed agents enter the foam and destroy it in this manner ( Fig 1B )[ 25 ].…”

Section: De-foaming Mechanismsmentioning

confidence: 99%

Beyond De-Foaming: The Effects of Antifoams on Bioprocess Productivity

Routledge

2012

Computational and Structural Biotechnology Journal

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Antifoams are often added to bioprocesses with little knowledge of their impact on the cells or product. However, it is known that certain antifoams can affect the growth rates of both prokaryotic and eukaryotic organisms in addition to changing surface properties such as lipid content, resulting in changes to permeability. This in turn can be beneficial to a recombinant protein production system for soluble proteins, as has been demonstrated by increased secretion of α-amylase and GFP, or achievement of greater yields of protein due to increased biomass. However, in some cases, certain concentrations of antifoams appear to have a detrimental effect upon cells and protein production, and the effects vary depending upon the protein being expressed. These findings emphasise the importance of optimising and understanding antifoam addition to bioprocesses.

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Section: De-foaming Mechanismsmentioning

confidence: 99%

Beyond De-Foaming: The Effects of Antifoams on Bioprocess Productivity

Routledge

2012

Computational and Structural Biotechnology Journal

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“…The reduction was more profound in the presence of 3 cP oil as the foam lost more than half of its original strength as indicated by a more than 50% reduction in pressure drop. This is due to the synergistic mechanism between oil bridging and oil spreading which destabilizes foam rapidly (Abdolahi et al 2005;Yekeen et al 2017a). Figure 10 further shows the effect of 3 cP oil on foam pore plugging pressure.…”

Section: Effect Of Oil Viscosity On Sds/silica Foam Performancementioning

confidence: 91%

Experimental investigation of enhancement of carbon dioxide foam stability, pore plugging, and oil recovery in the presence of silica nanoparticles

et al. 2018

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The influence of surface-modified silica (SiO 2) nanoparticles on the stability and pore plugging properties of foams in porous media was investigated in this study. The pore plugging ability of foams was estimated from the pressure drop induced during foam propagation in porous media. The results clearly showed that the modified SiO 2 nanoparticlestabilized foam exhibited high stability, and the differential pressure increased in porous media by as much as three times. The addition of SiO 2 nanoparticles to the foaming dispersions further mitigated the adverse effect of oil toward the foam pore plugging ability. Consequently, the oil recovery increased in the presence of nanoparticles by approximately 15% during the enhanced oil recovery experiment. The study suggested that the addition of surface-modified silica nanoparticles to the surfactant solution could considerably improve the conventional foam stability and pore plugging performance in porous media.

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“…With this, the addition of antifoams is the most preferred option to control the formation of foam due to its simplicity and persistency. On the basis of Figure , the oil which contains solid particles will (1) collect at the plateau border where the liquid is drained, (2) enter the film lamella (or pseudoemulsion film) where the antifoam forms a solid + oil lens, (3) bridge the lamella and become trapped in the thinning border, (4) dewet the foam film as the lamella becomes thinner, and (5) rupture and break the foam film as it completes the dewetting phase …”

Section: Fundamentals Of Foamingmentioning

confidence: 99%

“…On the basis of Figure 8, the oil which contains solid particles will (1) collect at the plateau border where the liquid is drained, (2) enter the film lamella (or pseudoemulsion film) where the antifoam forms a solid + oil lens, (3) bridge the lamella and become trapped in the thinning border, (4) dewet the foam film as the lamella becomes thinner, and ( 5) rupture and break the foam film as it completes the dewetting phase. 42 Furthermore, fast antifoam (usually mixed antifoams) ruptures the foam film during the initial stage of film thinning, hence enabling them to rupture foams in less than a minute by the bridging mechanism. On the other hand, slow antifoams (usually oils) require a few minutes to destroy the foams as the oil droplets are not able to penetrate the foam film.…”

Section: Enteringmentioning

confidence: 99%

Selection Criteria for Antifoams Used in the Acid Gas Sweetening Process

Lau

Partoon

et al. 2021

Ind. Eng. Chem. Res.

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Antifoam plays an essential role in maintaining the continuous removal of acid gases by the absorption process. However, a holistic review of the fundamentals and desirable selection criteria for different types of antifoams for the gas sweetening process is scarcely available. Therefore, this review analyses the selection criteria of each type of antifoam for acid gas sweetening, particularly silicone, polyether glycol, alcohol, and blended-based antifoams. These selection criteria are crucial in defining the properties and antifoaming performance in terms of solubility, dispersibility, surface tension, viscosity, defoaming rate, thermal stability, stability of defoaming performance, potential hazard, and chemical inertness. Hence, this review provides valuable insight into the existing and potential antifoams that could be employed in the acid gas sweetening process along with their distinctive antifoaming ability, benefits, and drawbacks. From this review, blended antifoam is able to fulfill most of the selection criteria and will be further explored in a subsequent study.

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The Mechanism of Action of Antifoams

Cited by 17 publications

References 20 publications

Beyond De-Foaming: The Effects of Antifoams on Bioprocess Productivity

Beyond De-Foaming: The Effects of Antifoams on Bioprocess Productivity

Experimental investigation of enhancement of carbon dioxide foam stability, pore plugging, and oil recovery in the presence of silica nanoparticles

Selection Criteria for Antifoams Used in the Acid Gas Sweetening Process

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