Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration
Neutron reflection has been used to study the air/solution interface of bis(2-ethylhexyl) sulfosuccinate-water at concentrations in the range 1-5% v/v, well above the critical micelle concentration of 0-11%. No features other than the adsorption of a monolayer are observed at a concentration of 1%,...
| Main Authors: | , , , |
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| Format: | Conference item |
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1996
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| _version_ | 1797099442453610496 |
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| author | Li, Z Lu, JR Thomas, R Penfold, J |
| author_facet | Li, Z Lu, JR Thomas, R Penfold, J |
| author_sort | Li, Z |
| collection | OXFORD |
| description | Neutron reflection has been used to study the air/solution interface of bis(2-ethylhexyl) sulfosuccinate-water at concentrations in the range 1-5% v/v, well above the critical micelle concentration of 0-11%. No features other than the adsorption of a monolayer are observed at a concentration of 1%, but at 2% and above peaks are observed in the specular reflectivity that correspond to a multilayer structure with a repeat distance of 175-180 Å. This is most probably caused by preferential adsorption of the lamellar phase, which in this concentration range coexists with solution and has a spacing of 180 Å. At the same time as the appearance of peaks in the specular reflectivity a strong peak also appears in the off-specular direction and we attribute this to conformal roughness of the multilayer structure. Such a large roughness is not caused by the actual air/water surface, but is probably a consequence of large amplitude undulations (Helfrich waves) in the bilayers constituting the lamellar structure at the interface. |
| first_indexed | 2024-03-07T05:23:47Z |
| format | Conference item |
| id | oxford-uuid:dfd88086-0eed-4311-b64b-3cc7cfa9a3dc |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:23:47Z |
| publishDate | 1996 |
| record_format | dspace |
| spelling | oxford-uuid:dfd88086-0eed-4311-b64b-3cc7cfa9a3dc2022-03-27T09:42:17ZNeutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentrationConference itemhttp://purl.org/coar/resource_type/c_5794uuid:dfd88086-0eed-4311-b64b-3cc7cfa9a3dcSymplectic Elements at Oxford1996Li, ZLu, JRThomas, RPenfold, JNeutron reflection has been used to study the air/solution interface of bis(2-ethylhexyl) sulfosuccinate-water at concentrations in the range 1-5% v/v, well above the critical micelle concentration of 0-11%. No features other than the adsorption of a monolayer are observed at a concentration of 1%, but at 2% and above peaks are observed in the specular reflectivity that correspond to a multilayer structure with a repeat distance of 175-180 Å. This is most probably caused by preferential adsorption of the lamellar phase, which in this concentration range coexists with solution and has a spacing of 180 Å. At the same time as the appearance of peaks in the specular reflectivity a strong peak also appears in the off-specular direction and we attribute this to conformal roughness of the multilayer structure. Such a large roughness is not caused by the actual air/water surface, but is probably a consequence of large amplitude undulations (Helfrich waves) in the bilayers constituting the lamellar structure at the interface. |
| spellingShingle | Li, Z Lu, JR Thomas, R Penfold, J Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title | Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title_full | Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title_fullStr | Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title_full_unstemmed | Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title_short | Neutron specular and off-specular reflection from the surface of aerosol-OT solutions above the critical micelle concentration |
| title_sort | neutron specular and off specular reflection from the surface of aerosol ot solutions above the critical micelle concentration |
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