Electrostatic effects in films stabilised by non-ionic surfactants

Márquez‐Beltrán, César; Langévin, D.

doi:10.1016/j.jcis.2006.10.015

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…4, the ionic strength of 10 À2 C 8 E 4 in the presence of 5 Â 10 À5 M NaCl should have reached about 1 Â 10 À4 M if all the ionic impurities are simply assumed to be monovalent ions. Similar observation was made by Márquez-Beltrán and Langevin [23], who found an increase in the conductivity of octyl-b-glucoside solutions with increasing surfactant concentration in the range of 1-9 Â 10 À3 M. that the f-potential remains nearly constant over the range of MIBC concentration studied. Similar trend was observed by Yoon and Yordan [61], who measured f-potential of air bubbles in aqueous solutions of polypropylene glycol and polyoxyethylene methyl ether.…”

Section: Effect Of Surfactant Type and Concentrationsupporting

confidence: 87%

“…Non-ionic surfactant foam films can be stabilized by electrostatic double-layer repulsion [18][19][20]23]. The double-layer force is determined largely by ionic strength (I) and surface potential (w).…”

Section: Effect Of Surfactant Type and Concentrationmentioning

confidence: 99%

“…The driving force for the drainage of foam films is the difference between the capillary (suction) pressure at the meniscus of the Plateau border and the surface forces between the two air/ water interfaces. The capillary pressure can be readily measured or calculated [14], while surface forces in foam films are complex and have been under extensive studies [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous thickness variation of the foam films stabilized by weak non-ionic surfactants

Wang

Karakashev

et al. 2009

Journal of Colloid and Interface Science

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Section: Effect Of Surfactant Type and Concentrationsupporting

confidence: 87%

Section: Effect Of Surfactant Type and Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anomalous thickness variation of the foam films stabilized by weak non-ionic surfactants

Wang

Karakashev

et al. 2009

Journal of Colloid and Interface Science

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“…Different thicknesses coexisting in the film, due to nucleation of dark holes, appear with different gray levels and can be measured by positioning the objective and estimating the reflected light. The applied pressure is gradually increased and the film thickness measured in each step so that the disjoining pressure versus thickness isotherm, Π( h ) is drawn. ,, The maximum pressure applied Δ P is limited by film rupture. Protein films were left to equilibrate for 30 min before measuring the foam film thickness.…”

Section: Experimental Methodsmentioning

confidence: 99%

On the Difference between Foams Stabilized by Surfactants and Whole Casein or β-Casein. Comparison of Foams, Foam Films, and Liquid Surfaces Studies

Maldonado-Valderrama

Langévin

2008

J. Phys. Chem. B

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This research work aims to investigate the behavior of a mixed system composed of a commercial protein (whole casein) and a low molecular weight surfactant (Tween 20) in order to understand its foam stability on the basis of fundamental surface quantities such as surface and disjoining pressure. These experiments prove to be extremely useful in the understanding of the processes determining foam stability. The complex behavior of whole casein/Tween 20 mixtures is directly deduced from the surface pressure isotherms. Concretely, the isotherm of the mixed system is displaced to smaller surfactant concentrations as compared to the pure surfactant system. This feature is quantified by a critical aggregation concentration and suggests formation of protein/surfactant complexes within the surface layer. The disjoining pressure isotherms of the pure and mixed systems provide key information regarding the structure and composition of the mixed whole casein/Tween 20 surface layers. Furthermore, they provide a direct correlation with the foam stability in terms of the thickness of the final foam film; the thinner the film, the less stable the foam. The experimental results are further discussed in terms of literature studies of similar systems, and a final rather accurate description of the system arises. This work investigates the importance of the nature of the protein in the stability of the foams of protein/surfactant mixtures and highlights the fundamental role of the surface properties in the understanding of such a major phenomenon in colloid science and technology.

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“…Trace addition of electrolyte (0.02 wt% KNO 3 ) improved the dispersion of colloid, while the continuous addition of electrolyte reduced its dispersion even to the agglomeration. According to DLVO,whether the colloid is stable or not depends on the balance between electrostatic attraction and electrostatic repulsion between particles [24,25]. The electrolyte concentration n 0 has a great in uence on the repulsion potential energy(U R ) according to formula 3.…”

Section: The Effect Of Electrolytes On the Dispersion Of The Slurrymentioning

confidence: 99%

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

Zeng

Zhao

Liu

et al. 2021

Preprint

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The colloidal silica is usually used as the abrasive for the copper CMP polishing slurry in integrated circuit multilayer copper wiring. The aggregation of colloidal silica in the slurries tend to aggregate spontaneously, resulting in the continuous changes of the polishing effect, such as scratch defects, removal rate, etc. This situation can lead to the potential instability of the polishing slurry, which should be avoided in industrial production. In this paper, the aggregation and dispersion properties of polishing slurries were systematically studied, and an improved scheme was proposed to improve the dispersion of slurries to prevent agglomeration. These affecting factors including slurries’ pH, electrolyte additive (KNO3) and polyelectrolyte (PAA-Na) were assessed with LPC, Zeta potential and particle size. A better pH range for slurries was determined from the point of view of isoelectric point and dissolution of colloidal silica. And the dissolution of colloidal silica was verified by UV-vis experiment. Anionic surfactant (SDS), Cationic surfactant (DTAC) and Nonionic surfactant (AEO-15) was analyzed for their dispersion in slurries from the point of view of static electricity force and steric hindrance space force, and the synergistic mechanism of mixed SDS and AEO-15 on slurries dispersion was put forward. In addition, the effect of the improvement of slurry dispersion on reducing scratching defects on the surface of polished copper blanket was also tested in this paper.

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Electrostatic effects in films stabilised by non-ionic surfactants

Cited by 13 publications

References 19 publications

Anomalous thickness variation of the foam films stabilized by weak non-ionic surfactants

Anomalous thickness variation of the foam films stabilized by weak non-ionic surfactants

On the Difference between Foams Stabilized by Surfactants and Whole Casein or β-Casein. Comparison of Foams, Foam Films, and Liquid Surfaces Studies

Methods and Mechanistic Analysis of Improving the Dispersion of Nano Silica Colloidal Particles in Chemical Mechanical Polishing Slurries

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