2001
DOI: 10.1021/la010601j
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Effect of Oily Additives on Foamability and Foam Stability. 2. Entry Barriers

Abstract: In the preceding paper of this series we studied the effect of several oils of different chemical structure on the foaming properties of sodium dodecylbenzenesulfonate solutions. A straightforward correlation was found between the foam stability and the so-called “entry barrier”, which prevents the emergence of pre-emulsified oil drops on the solution surface. In the present article we perform a systematic experimental study of the entry barriers for several oils by means of the recently developed film trappin… Show more

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Cited by 61 publications
(81 citation statements)
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“…The entry barrier is defined as the critical pressure that leads to rupture of the asymmetric oil-water-air film and entry of the drop at the water-air interface [54]. Antifoams with low entry barriers completely collapse the foam in seconds, whereas antifoams with high entry barriers require hours to destroy the foam.…”
Section: Antifoams and Foamabilitymentioning
confidence: 99%
See 1 more Smart Citation
“…The entry barrier is defined as the critical pressure that leads to rupture of the asymmetric oil-water-air film and entry of the drop at the water-air interface [54]. Antifoams with low entry barriers completely collapse the foam in seconds, whereas antifoams with high entry barriers require hours to destroy the foam.…”
Section: Antifoams and Foamabilitymentioning
confidence: 99%
“…Antifoams with low entry barriers completely collapse the foam in seconds, whereas antifoams with high entry barriers require hours to destroy the foam. The entry barrier has been found to increase with the surfactant concentration [54]. Once entering the foam film, antifoams destabilize the liquid film either by spreading the solution/gas interface or by bridging the two interfaces of the film, depending on the sign of the spreading coefficient, r S which is defined as follows [55]: …”
Section: Antifoams and Foamabilitymentioning
confidence: 99%
“…The "slow antifoam" is the one which first leaves the foam films and destroys the foam after entering the walls of the Plateau Borders. This entry barrier has been defined as a function of the critical capillary pressure or the disjoining pressure [71,76,[78][79] where the threshold value of the entry barrier is somewhere between 15 and 20 Pa, which separates the fast antifoam region from the slow one.…”
Section: Antifoaming and Defoaming In The Petroleum Industrymentioning
confidence: 99%
“…The effect of surfactant concentration on the entry barrier has been studied previously [122]. Figure 4 shows that the entry barrier increases as the surfactant concentration increases.…”
Section:  Surfactant Concentrationmentioning
confidence: 88%
“…However, the determination of their values is very difficult [107]. Alternatively, the capillary pressure of the air-water interface at the moment of oil drop entry, , has been proposed as a quantitative characteristic of the entry barrier because it is related to antifoam efficiency [118][119][120][121][122][123][124][125][126]. The film trapping technique (FTT) has also been developed to precisely measure the value of [127,128].…”
mentioning
confidence: 99%