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The Adsorption of Mixed Surfactants at the Hydrophilic Silica Surface from Aqueous Solution: Studied by Specular Neutron Reflection

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Abstract

Specular neutron reflection has been used to determine the structure and composition of the mixed ionic–non-ionic surfactants adsorbed at the hydrophilic silica solid/water interface. Measurements on two different mixed surfactant systems are reported: the cationic/nonionic mixture of hexadecyltrimethyl ammonium bromide, C16TAB, and hexaethylene glycol monododecyl ether, C12E6, and the anionic/nonionic mixture of sodium dodecyl sulfate, and C12E6. For the C16TAB–C12E6 mixture, pH is shown to have a dramatic effect on the relative affinity for adsorption of the two surfactants at the interface.

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Authors and Affiliations

  1. ISIS Facility, CLRC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 OQX, United Kingdom

    J. Penfold & E. J. Staples

  2. Unilever Research, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral, United Kingdom

    I. Tucker & L. J. Thompson

  3. Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford, United Kingdom

    R. K. Thomas

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  1. J. Penfold
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  2. E. J. Staples
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  3. I. Tucker
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  4. L. J. Thompson
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Penfold, J., Staples, E.J., Tucker, I. et al. The Adsorption of Mixed Surfactants at the Hydrophilic Silica Surface from Aqueous Solution: Studied by Specular Neutron Reflection. International Journal of Thermophysics 20, 19–34 (1999). https://doi.org/10.1023/A:1021413810630

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