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Surfactants in Solution pp 1303–1314Cite as

Analysis of Sans Data from Dense Microemulsions

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Abstract

Measurements of AOT/D2O/n-decane microemulsions containing comparable volumes of water, oil, and surfactant have been obtained with the small-angle scattering (SANS) technique. Each intensity spectrum exhibits a clear diffraction maximum. As the surfactant volume fraction Ψs increases, the peak position moves to higher values of Q, while the peak height diminishes. Attempts were made to interpret the intensity spectra using the following models: simple bicontinuous phase, lamellar structure, a dispersion of hard spheres, and spherical droplets interacting through a square--well attraction. These models proved to be unsatisfactory for understanding the SANS data. However, by assuming a phase consisting of spherical droplets with a very well-defined nearest-neighbor ordering, it is possible to successfully describe the shift in peak position Qmax. In particular, for microemulsions with equal volumes of water and oil, such a model predicts that

$$ {{\rm{Q}}_{\max }} = {{2.25} \over }{{{\phi _{\rm{s}}}} \over {{{(1 - {{\rm{\varphi }}_{\rm{s}}})}^{2/3}}}} $$

where Δ is the length of the surfactant molecule.

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Authors and Affiliations

  1. Exxon Research and Engineering Company, Annandale, New Jersey, 08801, USA

    M. Kotlarchyk, J. S. Huang & M. W. Kim

  2. Nuclear Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA

    S. H. Chen

Authors
  1. M. Kotlarchyk
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  2. J. S. Huang
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  3. M. W. Kim
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  4. S. H. Chen
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Editor information

Editors and Affiliations

  1. IBM Corporate Technical Institutes, 500 Columbus Ave., Thornwood, NY, 10594, USA

    Kashmiri Lal Mittal M.Sc.(First Class First), Ph.D. (Fellow of the American Institute of Chemists and Indian Chemial Society) (Fellow of the American Institute of Chemists and Indian Chemial Society)

  2. Centre de Recherches Paul Pascal, Domaine Universitaire, F-33405, Talence Cedex, France

    P. Bothorel (Professor of Chemistry at the University of Bordeaux, Assistant Director, Scientific Director of the GRECO “Microemulsions” (French cooperative action on microemulsions), consultant to the French Oil Company) (Professor of Chemistry at the University of Bordeaux, Assistant Director, Scientific Director of the GRECO “Microemulsions” (French cooperative action on microemulsions), consultant to the French Oil Company)

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© 1986 Plenum Press, New York

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Kotlarchyk, M., Huang, J.S., Kim, M.W., Chen, S.H. (1986). Analysis of Sans Data from Dense Microemulsions. In: Mittal, K.L., Bothorel, P. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1833-0_14

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  • DOI: https://doi.org/10.1007/978-1-4613-1833-0_14

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-9024-7

  • Online ISBN: 978-1-4613-1833-0

  • eBook Packages: Springer Book Archive

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