Adsorption of poly(ethylene oxide) at the air/water interface: A dynamic and static surface tension study

Gilányi, Tíbor; Varga, Imre; Gilányi, Magdolna; Mészáros, Róbert

doi:10.1016/j.jcis.2006.05.034

Cited by 49 publications

(64 citation statements)

References 37 publications

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“…On the other hand, as it was shown in Ref. [31] the activity of the PEO can be well approximated by its concentration in the investigated concentration range.…”

Section: General Framework For the Thermodynamic Analysis Of The Surfsupporting

confidence: 67%

“…According to the observed values of t eq in Ref. [31] (for instance t eq ∼ = 1000 s was observed for M PEO = 8 × 10 3 at 0.004 g/L concentration) the characteristic equilibration time in the applied PEO concentration range (> 0.1 g/L) of our work can be predicted to be less than 1 s. On these grounds, for all of our solutions of SDS and PEO we adopted the σ value, obtained by extrapolation back to 1 s from the measured kinetics, to represent the equilibrium surface tension of the pure solutions.…”

Section: The Equilibrium Surface Tension Of the Solutionsmentioning

confidence: 88%

“…1a of Ref. [31]) confirmed for the aqueous solutions of PEO that the equilibrium value of the surface tension is virtually reached within a time period called t eq that scales with the inverse square of the PEO concentration. According to the observed values of t eq in Ref.…”

Section: The Equilibrium Surface Tension Of the Solutionsmentioning

confidence: 88%

“…In this model system, a rationale can be given for the determination of the equilibrium surface tension based on previous works with SDS [29,30] and PEO [31]. We put these advantages to good use in order to determine the adsorbed amount of the surfactant and that of the polymer on the basis of the Gibbs equation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Péron

Mészáros

Varga

et al. 2007

Journal of Colloid and Interface Science

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“…On the other hand, as it was shown in Ref. [31] the activity of the PEO can be well approximated by its concentration in the investigated concentration range.…”

Section: General Framework For the Thermodynamic Analysis Of The Surfsupporting

confidence: 67%

Section: The Equilibrium Surface Tension Of the Solutionsmentioning

confidence: 88%

Section: The Equilibrium Surface Tension Of the Solutionsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Péron

Mészáros

Varga

et al. 2007

Journal of Colloid and Interface Science

Self Cite

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“…However, we note that slightly lower values, with a monolayer completed between 0.5 and 0.6 mg m −2 were obtained from neutron reflectometry measurements by Henderson et al 55 and Lu et al 56 . This difference of surface excess from experiments is outside the experimental error and has been noted to be due to the properties of PEG films that are sensitive to the molecular weight used in each study 56,63,64 . We note that the molecular weight of chains used in our simulation study is lower than used in experiments, and so we expect a slightly larger surface concentration to be possible in the simulations.…”

Section: Density Profilesmentioning

confidence: 88%

A coarse-grained model for polyethylene glycol in bulk water and at a water/air interface

Prasitnok

Wilson

2013

Phys. Chem. Chem. Phys.

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Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. A coarse-grained model for polyethylene glycol (PEG) in water has been developed using a combination of the iterative Boltzmann inversion (IBI) methodology and a suitable coarse-grained water potential. The combined coarse-grained model is shown to be effective in reproducing the properties of single chains in bulk water and multiple chains across a series of chain lengths and concentrations, and is transferable to PEG chains at a water/air interface. Good agreement is achieved with both experiment and reference atomistic simulations in an explicit solvent. Simulations of a single chain in aqueous solution yield a molecular weight (M W )-radius of gyration (R g ) relation that compares favourably with the reported scaling law from experiment. Simulations of multiple chains across a wide concentration range show no concentration dependence of R g , in agreement with previous atomistic simulations. The model we develop is shown to be transferable between polymer in bulk water and at a water/air interface. For interfacial simulations, PEG chains are found to spontaneously migrate to the surface and adsorb to form a thin surface layer, which thickens with increasing surface concentration. The point at which the surface is fully saturated with polymer, and the polymer layer thicknesses obtained from simulations, are both in good agreement with experimental findings. At high surface concentrations, when the surface is fully saturated with polymer, ethylene oxide (EO) segments are found to extend into the water subphase as loop and tail conformations, with this extension increasing with further increases in the surface concentration.The coarse-grained model is noted to provide very large increases in simulation speed, with equilibration times of < 1000× the reference atomistic models. We also consider a number of different coarse-grained models for water in this study, showing that the CSJ model adopted in this work [Chiu et al., J. Chem. Theory Comput. 2010, 6, 851] is far superior for studying water at a water/air surface, than many of the previous coarse-grained models of water.

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Investigating the micellization behavior of cetyltrimethylammonium bromide: As affected by the contents of poly(ethylene oxide) and temperature of the system

Baloch

Ahmad

Durani

et al. 2010

J of Applied Polymer Sci

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The micellization behavior of cetyltrimethylammonium bromide (CTAB) is investigated in the absence and presence of poly(ethylene oxide) employing surface tension, light scattering, and viscosity and conductance measurement. It has been concluded that the critical micellization concentration (CMC) of CTAB in the presence of polymer increases with the increase in polymer concentration. The three ranges of interaction among the polymer and CTAB with respect to concentration of CTAB are identified at surface tension plot and noted to depend upon polymer concentration. The effect of temperature over these interactions and CMC of CTAB has been investigated. It is observed that the CMC, DH, and flow activation energy of the system increases with the increase in polymer concentration whereas CMC of CTAB decreases with the temperature. R H and R g /R H values determined by light scattering also indicate such type of behavior. The CMC values have also been obtained by viscosity and conductivity measurement. The results and conclusions drawn through all the techniques were consistent. New methodology has also been introduced to interpret the data obtained by surface tension, viscosity, and conductance measurement, and get information about the point of interaction and saturation of polymer with surfactant, which was noted to be very useful and informative.

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Adsorption of poly(ethylene oxide) at the air/water interface: A dynamic and static surface tension study

Cited by 49 publications

References 37 publications

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

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

A coarse-grained model for polyethylene glycol in bulk water and at a water/air interface

Investigating the micellization behavior of cetyltrimethylammonium bromide: As affected by the contents of poly(ethylene oxide) and temperature of the system

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