Competitive adsorption of sodium dodecyl sulfate and polyethylene oxide at the air/water interface

Péron, N.; Mészáros, Róbert; Varga, Imre; Gilányi, Tíbor

doi:10.1016/j.jcis.2007.04.031

Cited by 29 publications

(37 citation statements)

References 35 publications

(97 reference statements)

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“…40,41 Many studies have focused on the competitive adsorption of various uncharged polymers and SDS at airwater interfaces. In both experiments 42 and molecular simulations, 43 SDS is shown to signicantly alter the conformation of interfacially adsorbed polymer chains. However, depending on the particular polymer and surfactant, these affects can either lead to a decrease 34 or increase 44 in the surface excess of polymer.…”

Section: Introductionmentioning

confidence: 94%

“…As the SDS concentration increases (but remains below the cac), free surfactant monomers in the continuous phase can associate with the loops and trains of PEG chains adsorbed at the oil-water interface, resulting in stretching of the polymer conformation into the continuous phase at low ionic strength. 42 It is possible that such structures can bridge between droplet surfaces, producing a temporary network. However, the diameter of gyration ($2 nm) 11 of the low-molecular weight PEGDA, which sets the length scale for bridging, 68 is signicantly smaller than the mean interdroplet separation at the volume fractions studied here (8-10 nm).…”

Section: Concentration Dependence Of Viscoelasticitymentioning

confidence: 99%

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Polymer–surfactant complexation as a generic route to responsive viscoelastic nanoemulsions

et al. 2013

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We present a new scheme for imparting thermoreversible viscoelasticity to oil-in-water nanoemulsions based on polymer-surfactant self-assembly in solution. Specifically, bridging of polymer-induced micelles in the aqueous phase give rise to a transient network of interdroplet bridges without compromising colloidal stability. Characterization of the structure, dynamics, and rheological properties over a broad range of material chemistries and compositions suggests rules for controlling the resulting viscoelasticity. Remarkably, the linear viscoelasticity of these systems exhibits time-temperature superposition, which is purely driven by dynamics without noticeable structure changes. This allows quantification of an activation energy for network formation, which is correlated with the viscoelastic properties across a number of parameters, including polymer and surfactant concentration as well as droplet size. However, a complex dependence of the activation energy on fluid composition distinguishes these novel viscoelastic nanoemulsions from other types of transient gels, and we reconcile their behaviour with established mechanisms of polymer-surfactant complexation.

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Section: Introductionmentioning

confidence: 94%

Section: Concentration Dependence Of Viscoelasticitymentioning

confidence: 99%

Polymer–surfactant complexation as a generic route to responsive viscoelastic nanoemulsions

et al. 2013

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“…Therefore, the polygonal ends formed at high AuCl À 4 concentration regions and finally evolved into the large polygonal heads of gold nanosnakes. With the increase of SDS concentration, SDS-bound micelles become more and more compact and even densely disperse on PVP backbones [18,20]. The discrepancy of AuCl À 4 concentrations at the vicinity of SDS-bound micelles and PVP blank chains will be more pronounced.…”

Section: Effect Of Sds Concentration On the Morphology Of Gold Nanostmentioning

confidence: 99%

“…When no SDS was added, HAuCl 4 was reduced by PVP to form planar nuclei due to the weak reducing power of PVP [15] and these planar nuclei would grow into tortuous nanobelts under the influence of the PVP chains. In PVP-SDS binary solution, once SDS concentration exceeded the critical aggregation concentration (cac), micellar-like SDS aggregations formed on PVP backbones to assemble PVP-SDS aggregations (for our PVP-SDS system, cac was 1.7 mM) [16][17][18]. In PVP-SDS aggregation solution, the concentration of AuCl À 4 ions at the vicinity of SDS-bound micelles and PVP blank chains will be different because of the electrostatic repulsion between SDS-bound micelles and AuCl À 4 ions.…”

Section: Effect Of Sds Concentration On the Morphology Of Gold Nanostmentioning

confidence: 99%

Controlled synthesis of gold nanosnakes assisted by poly(vinyl pyrrolidone)–sodium dodecyl sulphate aggregations

Ren

et al. 2013

Journal of Experimental Nanoscience

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Anisotropic single-crystalline gold nanosnakes were synthesised in poly(vinyl pyrrolidone) (PVP)-sodium dodecyl sulphate (SDS) aggregation aqueous solution by reducing HAuCl 4 with PVP without any additional reducing agent. The crystal structures, growth process and the influence of SDS concentrations on the growth of gold nanosnakes have been investigated by X-ray diffraction and transmittance electron microscopy. In this approach, the peculiar structure of PVP-SDS aggregations is indispensable for the asymmetrical formation of gold nanosnakes. Without PVP-SDS aggregations, only long tortuous gold nanobelts were synthesised. When SDS concentration was increased from 3 to 10 mM, gold nanosnakes, nanokites and nanoplates were fabricated. To the best of our knowledge, this is the first report on the SDS-induced shape transformation from snake-like to plate-like at fixed low HAuCl 4 concentration in PVP-SDS aggregation aqueous solutions. Moreover, the gold nanosnakes exhibit excellent electrocatalytic property towards the oxidation of methanol indicating their potential applications in fuel cells, catalysis, biosensing and nanodevices.

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“…[13][14][15][16][17][18] For example, the interaction of poly(ethylene glycol) (PEG or PEO) with ionic surfactants such as sodium dodecyl sulfate (SDS), cesium perfluorooctanoate (CsPFO), and lithium perfluoronctanoate (LiPFO) has been investigated. 14, [19][20][21] And the results indicate that the addition of PEG induces the surfactants to aggregate, and that the structure of the surface/PEG complexes depends on the concentration and molecular weight of PEG and on the hydrophobic segments of surfactants.…”

Section: Introductionmentioning

confidence: 99%

Binding Characteristics between Poly(ethylene glycol) and Hydrophilic Modified Ibuprofen in Aqueous Solution

Wei

Guo

2010

J. Phys. Chem. B

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The solubility of ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID), is enhanced by synthesizing ibuprofen ester with a water-soluble polymer, poly(ethylene glycol) (PEG), and the product obtained functions as a nonionic surfactant (IBF-PEG800, IP800). The morphology and aggregation behavior of IP800 micelles and IP800/PEG complexes in aqueous solution are investigated by (1)H NMR technology, dynamic light scattering (DLS), isothermal titration calorimetry (ITC), and fluorescence resonance energy transfer (FRET). The microstructure of IP800 micelles is strongly related to the concentration of IP800. IP800 monomers can form looser micelles at relatively low concentrations and much tighter micelles at high concentrations. And the binding model of PEG with looser IP800 micelles dramatically depends on the molecular weight and concentration of PEG: PEG with lower molecular weight (MW < or = 2000 Da) inserts to the interface of the hydrophilic corona and hydrophobic core of IP800 micelles; PEG with higher molecular weight (MW > 2000 Da) binds to the surface of IP800 micelles, and one long PEG chain (6000 < MW < or = 20000 Da) wraps several IP800 micelles. Besides, the ratio of short chain PEG400 to IP800 micelles of the IP800/PEG complex is about 15:1 at a fixed concentration of IP800 (0.05 mM), and for the long chain PEG20000 it is 1:3-1:4.

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Competitive adsorption of sodium dodecyl sulfate and polyethylene oxide at the air/water interface

Cited by 29 publications

References 35 publications

Polymer–surfactant complexation as a generic route to responsive viscoelastic nanoemulsions

Polymer–surfactant complexation as a generic route to responsive viscoelastic nanoemulsions

Controlled synthesis of gold nanosnakes assisted by poly(vinyl pyrrolidone)–sodium dodecyl sulphate aggregations

Binding Characteristics between Poly(ethylene glycol) and Hydrophilic Modified Ibuprofen in Aqueous Solution

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