| Numéro |
J. Phys. Colloques
Volume 50, Numéro C7, Octobre 1989
X-ray and Neutron Scattering from Surfaces and Thin FilmsProceedings of the International Conference on Surface and Thin Film studies using Glancing-Incidence X-ray and Neutron Scattering |
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|---|---|---|
| Page(s) | C7-75 - C7-81 | |
| DOI | https://doi.org/10.1051/jphyscol:1989707 | |
X-ray and Neutron Scattering from Surfaces and Thin Films
Proceedings of the International Conference on Surface and Thin Film studies using Glancing-Incidence X-ray and Neutron Scattering
J. Phys. Colloques 50 (1989) C7-75-C7-81
DOI: 10.1051/jphyscol:1989707
1 Physical Chemistry Laboratory, South Parks Road, GB-Oxford OX1 3QZ, Great-Britain
2 Rutherford Appleton Laboratory, Chilton, Didcot, GB-Oxon., Great-Britain
Proceedings of the International Conference on Surface and Thin Film studies using Glancing-Incidence X-ray and Neutron Scattering
J. Phys. Colloques 50 (1989) C7-75-C7-81
DOI: 10.1051/jphyscol:1989707
THE STRUCTURE OF SURFACES OF SURFACTANT SOLUTIONS ABOVE THE CRITICAL MICELLE CONCENTRATION
E.M. LEE1, E.A. SIMISTER1, R.K. THOMAS1 et J. PENFOLD21 Physical Chemistry Laboratory, South Parks Road, GB-Oxford OX1 3QZ, Great-Britain
2 Rutherford Appleton Laboratory, Chilton, Didcot, GB-Oxon., Great-Britain
Abstract
Specular reflection of neutrons from surfactant solutions above their critical micelle concentrations indicates that layer structures are formed in the vicinity of the surface. The mean spacing of the structures varies with chainlength in a way that suggests the presence of surfactant bilayers. The number of layers is estimated to be between about 5 and 15. Near the surface the structure seems to be similar to either a nematic phase or a lamellar phase. The presence of a layered structure would require there to be a large surface excess of surfactant.