Adsorption of Oppositely Charged Polyelectrolyte/Surfactant Complexes at the Air/Water Interface: Formation of Interfacial Gels

Monteux, Cécile; Williams, C. E.; Meunier, Jacques; Anthony, Olivier; Bergeron, Vance

doi:10.1021/la0347861

Cited by 157 publications

(211 citation statements)

References 39 publications

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“…As explained in Section 2, the analyzer and polarizer were adjusted before new image was recorded. These images are very similar to the photographic images made by Monteux et al [13] of foam films containing microgels formed from polymer/surfactant aggregates. Their films show also an extremely slow drainage.…”

Section: Images Of Films At 01 M Nacl (Figs 6d-6f)supporting

confidence: 85%

Thinning of wetting films formed from aqueous solutions of non-ionic surfactant

Eliseeva¹,

Fokkink²,

Besseling³

et al. 2006

Journal of Colloid and Interface Science

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Section: Images Of Films At 01 M Nacl (Figs 6d-6f)supporting

confidence: 85%

Thinning of wetting films formed from aqueous solutions of non-ionic surfactant

Eliseeva¹,

Fokkink²,

Besseling³

et al. 2006

Journal of Colloid and Interface Science

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“…New information accessible through X-ray and neutron reflectivity measurements show that several polyelectrolytesurfactant complexes are being formed at the air/solution interface at surfactant concentrations lower than that seen in the bulk phase [39][40][41]. The polyelectrolyte configurations in the bulk and at the air/solution interface are very different and no doubt the complexes formed in the bulk phase differ from those formed at the surface.…”

Section: Air/solution Interface Propertiesmentioning

confidence: 99%

Interactions in mixed cationic surfactants and dextran sulfate aqueous solutions

Tomašić

Šmit

et al. 2005

Journal of Colloid and Interface Science

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“…Even when ions are depleted from the interface, the extent of depletion is limited to a nanometer length scale (8). Charged species can also be driven to an air-water interface by covalently attaching them to hydrophobic moieties, as in ionic surfactants, or interfacially active proteins (9,10). Thermodynamics of ion adsorption to interfaces are complex, determined by a balance of energetic and entropic contributions (7,11,12).…”

mentioning

confidence: 99%

Water-mediated ion–ion interactions are enhanced at the water vapor–liquid interface

Venkateshwaran

Vembanur

Garde

2014

Proc. Natl. Acad. Sci. U.S.A.

108

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There is overwhelming evidence that ions are present near the vapor-liquid interface of aqueous salt solutions. Charged groups can also be driven to interfaces by attaching them to hydrophobic moieties. Despite their importance in many self-assembly phenomena, how ion-ion interactions are affected by interfaces is not understood. We use molecular simulations to show that the effective forces between small ions change character dramatically near the water vapor-liquid interface. Specifically, the water-mediated attraction between oppositely charged ions is enhanced relative to that in bulk water. Further, the repulsion between like-charged ions is weaker than that expected from a continuum dielectric description and can even become attractive as the ions are drawn to the vapor side. We show that thermodynamics of ion association are governed by a delicate balance of ion hydration, interfacial tension, and restriction of capillary fluctuations at the interface, leading to nonintuitive phenomena, such as watermediated like charge attraction. "Sticky" electrostatic interactions may have important consequences on biomolecular structure, assembly, and aggregation at soft liquid interfaces. We demonstrate this by studying an interfacially active model peptide that changes its structure from α-helical to a hairpin-turn-like one in response to charging of its ends. T raditional models of an air-water interface of a salt solution present a picture in which salt ions are excluded from the interfacial region (1). However, recent simulations and experiments have shown that certain chaotropic ions, such as iodide, azide, and thiocyanate, can adsorb to the air-water interface (2-7). Even when ions are depleted from the interface, the extent of depletion is limited to a nanometer length scale (8). Charged species can also be driven to an air-water interface by covalently attaching them to hydrophobic moieties, as in ionic surfactants, or interfacially active proteins (9, 10). Thermodynamics of ion adsorption to interfaces are complex, determined by a balance of energetic and entropic contributions (7,11,12). The net energetic contribution can be favorable or unfavorable, depending on the differences between ion-water, ion-ion, and water-water interactions in bulk and at the interface. The entropic contribution is typically unfavorable due to the restriction of water molecules in the hydration shell of the ion and the corresponding pinning of capillary fluctuations at the interface (7,13,14). Solvent structure and fluctuations at the interface are also known to play an important role in ion dissociation pathways in the transport of ions across liquid-liquid interfaces (15). How these factors govern the effective ion-ion interactions near aqueous interfaces and, in turn, influence interfacial self-assembly and aggregation is, however, not understood.We present results from extensive molecular simulations of ion hydration and ion-ion interactions near a water vapor-liquid interface. Our principal results are that solvent-mediated ...

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Adsorption of Oppositely Charged Polyelectrolyte/Surfactant Complexes at the Air/Water Interface: Formation of Interfacial Gels

Cited by 157 publications

References 39 publications

Thinning of wetting films formed from aqueous solutions of non-ionic surfactant

Thinning of wetting films formed from aqueous solutions of non-ionic surfactant

Interactions in mixed cationic surfactants and dextran sulfate aqueous solutions

Water-mediated ion–ion interactions are enhanced at the water vapor–liquid interface

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