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Scattering from Dilute and Lamellar Phase Solutions of Aerosol-OT Simultaneous Probe of Surface Structures and Bulk

  • Maja S. Hellsing
  • Adrian R. Rennie
  • Lionel Porcar
  • Carl-Johan Englund
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 138)

Abstract

The benefits of simultaneous studies of adsorbed layers and bulk structures are shown for solutions of the surfactant Aerosol-OT. Above the critical micelle concentration, Aerosol-OT forms an aligned lamellar phase at the sapphire/solution interface which is in equilibrium with a bulk phase that consists of coexisting micellar solution and dispersed lamellar phase. Measurements of the aligned surface layers and the bulk scattering from a 2 % wt solution by grazing incidence and small-angle neutron scattering show that the bulk consist of lamellar structures with the same d-spacing as seen at the surface but without the surface induced alignment. The surface lamellar structure corresponds to a 10 % volume fraction for a 2 % wt bulk which implies that there must be coexistence of regions of different concentration. Scattering patterns measured in grazing incidence geometry clearly show the relative contributions from small-angle scattering and specular reflectivity.

Keywords

sodium bis 2-ethylhexyl sulfosuccinate lamellar phase scattering 

Notes

Acknowledgements

We are grateful to the Institut Laue Langevin for allocation of beam time for these measurements.

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Maja S. Hellsing
    • 1
  • Adrian R. Rennie
    • 1
  • Lionel Porcar
    • 2
  • Carl-Johan Englund
    • 1
  1. 1.Department of Physics and Astronomy, Ångström LaboratoryUppsala UniversityUppsalaSweden
  2. 2.Institut Laue LangevinGrenobleFrance

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