Monolayer Films of Poly(dimethylsiloxane) on Aqueous Surfactant Solutions

Bergeron, Vance; Langévin, D.

doi:10.1021/ma950325d

Cited by 27 publications

(24 citation statements)

References 26 publications

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“…Considering this constraint, Bergeron and coworkers incorporated the thin-film forces into the classical entering and spreading expressions via the knowledge of the disjoining pressure isotherms and established a good correlation between the asymmetric film stability and the foam stability in the presence of oil. [21,22,23].…”

Section: Physico-chemistry Conditions To Ensure the Stability Of Olf mentioning

confidence: 99%

Stable oil-laden foams: Formation and evolution

Mensire

Lorenceau

2017

Advances in Colloid and Interface Science

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The interaction between oil and foam has been the subject of various studies. Indeed, oil can be an efficient defoaming agent, which can be highly valuable in various industrial applications where undesired foaming may occur, as seen in jet-dyeing processes or waste water treatment plant. However, oil and foam can also constructively interact as observed in detergency, fire-fighting, food and petroleum industries, where oil can be in the foam structure or put into contact with the foam without observing a catastrophic break-up of the foam. Under specific physico-chemistry conditions, the oil phase can even be trapped inside the aqueous network of the foam, thus providing interesting complex materials made of three different fluid phases that we name oil-laden foam (OLF). In this review, we focus on such systems, with a special emphasis on dry OLF, i.e. with a total liquid volume fraction, ε smaller than 5%. We first try to clarify the physical and chemical conditions for these systems to appear, we review the different techniques of the literature to obtain them. Then we discuss their structure and identify two different OLF morphologies, named foamed emulsion, in which small oil globules are comprised within the network of the aqueous foam and biliquid foams, where the oil also comprised in the aqueous foam network is continuous at the scale of several bubbles. Last, we review the state of the art of their evolution in particular concerning topological changes, coalescence, coarsening and drainage.

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Section: Physico-chemistry Conditions To Ensure the Stability Of Olf mentioning

confidence: 99%

Stable oil-laden foams: Formation and evolution

Mensire

Lorenceau

2017

Advances in Colloid and Interface Science

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“…Let us recall however that Ay cannot be clearly related to a polymer surface pres sure tt, since the polymer may affect the underlying surfactant layer. The exponent y is still smaller for the CnTAB's: re = 9, y = 1.7; re = 10, y = 1.55; n = 12, y = 1.2; re = 14 and 16, y = 0.8 [11].…”

Section: Polydimethylsiloxane-surfactant Mixed Monolayersmentioning

confidence: 88%

“…Data for the three systems water, AOT and C10E5 solutions are Change in surface tension as a function of polymer concen tration on different substrates: pure water (squares with crosses); C|2TAB (filled squares), C10E5 (empty squares), C16TAB (crosses) and AOT solutions (triangles). After [11], given in Figure 2. If one assumes that the ellipticity of the substrate, (p)s is unchanged by the presence of the polymer, and that the polymer form an isotropic layer above the solution with the bulk polymer density and index of refraction, one gets:…”

Section: Polydimethylsiloxane-surfactant Mixed Monolayersmentioning

confidence: 99%

Polymer-Surfactant Mono and Bilayers

Langévin

1997

Rev. Inst. Fr. Pét.

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Malgré de nombreux travaux sur les associations entre polymères et tensioactifs en solution, les associations localisées sur des sur faces ont été beaucoup moins étudiées. Dans cette présentation différents exemples seront présentés: des polymères non solubles dans l'eau étalés à la surface de solutions aqueuses de tensioac tifs, des polymères hydrosolubles adsorbés avec des molécules de tensioactifs à la surface de la solution. La première situation sera illustrée par du PDMS (polydiméthylsiloxane) étalé sur des monocouches de tensioactifs de différentes longueurs de chaînes. La pénétration des chaînes de polymères dans la couche de tensioactifs a été étudiée à l'aide de différentes techniques (tension superficielle, ellipsométrie, réflecti vité de neutrons). Des exemples de la deuxième situation seront donnés à l'aide de deux polyélectrolytes (polystyrène sulfonate PSS and poly acrylamide sulfonate PAMPS) et différents tensioactifs (ioniques et non-ioniques). Les mesures de tension superficielles de solutions diluées de tensioactif non ionique (C10E6) montrent qu'il existe une forte interaction avec le PSS et pas d'interaction avec le PAMPS. Cet effet est probablement dû au caractère hydrophobe plus impor tant du squelette de la chaîne de PSS. Des expériences de dif fraction des rayons X et de microscopie électronique sur des phases lamellaires en présence de PSS montrent que les chaînes de polymères sont imbriquées à l'intérieur de la bicouche de ten sioactifs. Les interactions entre PSS et PAMPS avec des tensioac tifs cationiques (DTAB) de charges opposées ont aussi été étudiées par tension superficielle, ellipsométrie et appareil de force de film mince. Un complexe de surface étendu polymère/tensioactif se forme et un phénomène de stratification est observé dans les films minces formés à partir des solutions.(1) Avenue Albert Schweitzer, 33600 Pessac -France POLYMER-SURFACTANT MONO AND BILAYERSAlthough there are many studies of association of polymers and surfactants in solution, much less is known about their association at surfaces. In this paper, several examples will be presented: water insoluble polymers spread at the surface of surfactant aque ous solutions, water soluble polymers adsorbed with the surfactant at the surface of the solution.Examples of the first case will be given with PDMS (polydimethylsiloxane) spread onto monolayers of surfactants of differ ent chain lengths. The penetration of the polymer into the surfac tant layer has been studied with different techniques (surface tension, ellipsometry, neutron reflectivity). Examples of the second case will be given with two different poly electrolytes (polystyrene sulfonate PSS and polyacrylamide sul fonate PAMPS) and various surfactants (ionic and nonionic). REVUE DE L'INSTITUT FRANÇAIS DU PÉTROLE VOL. 52, N° 2, MARS-AVRIL 1997 109 POLYMER-SURFACTANT MONO AND BILAYERSSurface tension measurements of the dilute solutions with a non ionic surfactant (C10E5) show that there is a strong interaction with PSS and no interaction with PAMPS. This is pr...

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“…Despite its simplicity, all pure spreading liquids investigated to date appear to follow Eq. [1], even when the substrate liquid contains surfactants that are insoluble in the drop (13,14). Conversely, the topic of aqueous surfactant solutions spreading on immiscible organic substrates has been pursued only minimally.…”

Section: Introductionmentioning

confidence: 99%

“…[13] and [14] remain, but in the limit of diffusion control Eq. [B1] reveals that to leading order the boundary condition of Eq.…”

mentioning

confidence: 99%