Interaction between poly(ethylene oxide) and sodium dodecyl sulfate studied by neutron reflection

D. J. Cooke; C. C. Dong; J. R. Lu; R. K. Thomas; E. A. Simister; J. Penfold

doi:10.1021/jp9804291

Interaction between poly(ethylene oxide) and sodium dodecyl sulfate studied by neutron reflection

D. J. Cooke, C. C. Dong, J. R. Lu, R. K. Thomas^*, E. A. Simister, J. Penfold

^*Corresponding author for this work

Biological Physics Group

Research output: Contribution to journal › Article › peer-review

Abstract

The composition of the air/solution interface of aqueous mixtures of sodiumdodecyl sulfate (NaDS) and poly-(ethylene oxide) (PEO) has been studied as a function of NaDS concentration and at a fixed concentration of 0.1 wt % PEO using neutron specular reflection. With increasing surfactant concentration, the polymer is progressively displaced from the surface until, at the critical aggregation concentration (CAC), it can no longer be detected (area per segment greater than about 80 Å². The adsorption of surfactant increases steadily with concentration and shows no sign of a discontinuity at the CAC (4.5 mM at 35°C), which is consistent with the break in the surface tension curve being caused only by the onset of surfactant/polymer aggregation in the bulk solution. At all concentrations the adsorption of NaDS at the air/solution interface is less in the presence of polymer than that in the corresponding solutions without polymer. Nevertheless, it is shown that there is some cooperativity in the adsorption of polymer and surfactant at the interface.

Original language	English
Pages (from-to)	4912-4917
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	102
Issue number	25
DOIs	https://doi.org/10.1021/jp9804291
Publication status	Published - 18 Jun 1998

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title = "Interaction between poly(ethylene oxide) and sodium dodecyl sulfate studied by neutron reflection",

abstract = "The composition of the air/solution interface of aqueous mixtures of sodiumdodecyl sulfate (NaDS) and poly-(ethylene oxide) (PEO) has been studied as a function of NaDS concentration and at a fixed concentration of 0.1 wt % PEO using neutron specular reflection. With increasing surfactant concentration, the polymer is progressively displaced from the surface until, at the critical aggregation concentration (CAC), it can no longer be detected (area per segment greater than about 80 {\AA}2. The adsorption of surfactant increases steadily with concentration and shows no sign of a discontinuity at the CAC (4.5 mM at 35°C), which is consistent with the break in the surface tension curve being caused only by the onset of surfactant/polymer aggregation in the bulk solution. At all concentrations the adsorption of NaDS at the air/solution interface is less in the presence of polymer than that in the corresponding solutions without polymer. Nevertheless, it is shown that there is some cooperativity in the adsorption of polymer and surfactant at the interface.",

author = "Cooke, {D. J.} and Dong, {C. C.} and Lu, {J. R.} and Thomas, {R. K.} and Simister, {E. A.} and J. Penfold",

year = "1998",

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doi = "10.1021/jp9804291",

language = "English",

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journal = "Journal of Physical Chemistry B",

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T1 - Interaction between poly(ethylene oxide) and sodium dodecyl sulfate studied by neutron reflection

AU - Cooke, D. J.

AU - Dong, C. C.

AU - Lu, J. R.

AU - Thomas, R. K.

AU - Simister, E. A.

AU - Penfold, J.

PY - 1998/6/18

Y1 - 1998/6/18

N2 - The composition of the air/solution interface of aqueous mixtures of sodiumdodecyl sulfate (NaDS) and poly-(ethylene oxide) (PEO) has been studied as a function of NaDS concentration and at a fixed concentration of 0.1 wt % PEO using neutron specular reflection. With increasing surfactant concentration, the polymer is progressively displaced from the surface until, at the critical aggregation concentration (CAC), it can no longer be detected (area per segment greater than about 80 Å2. The adsorption of surfactant increases steadily with concentration and shows no sign of a discontinuity at the CAC (4.5 mM at 35°C), which is consistent with the break in the surface tension curve being caused only by the onset of surfactant/polymer aggregation in the bulk solution. At all concentrations the adsorption of NaDS at the air/solution interface is less in the presence of polymer than that in the corresponding solutions without polymer. Nevertheless, it is shown that there is some cooperativity in the adsorption of polymer and surfactant at the interface.

AB - The composition of the air/solution interface of aqueous mixtures of sodiumdodecyl sulfate (NaDS) and poly-(ethylene oxide) (PEO) has been studied as a function of NaDS concentration and at a fixed concentration of 0.1 wt % PEO using neutron specular reflection. With increasing surfactant concentration, the polymer is progressively displaced from the surface until, at the critical aggregation concentration (CAC), it can no longer be detected (area per segment greater than about 80 Å2. The adsorption of surfactant increases steadily with concentration and shows no sign of a discontinuity at the CAC (4.5 mM at 35°C), which is consistent with the break in the surface tension curve being caused only by the onset of surfactant/polymer aggregation in the bulk solution. At all concentrations the adsorption of NaDS at the air/solution interface is less in the presence of polymer than that in the corresponding solutions without polymer. Nevertheless, it is shown that there is some cooperativity in the adsorption of polymer and surfactant at the interface.

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JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

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ER -

Interaction between poly(ethylene oxide) and sodium dodecyl sulfate studied by neutron reflection

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