STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS
We have determined the structure of a monolayer of dodecyltrimethylammonium bromide (C12TAB) adsorbed at the air/water interface at three surface concentrations corresponding to areas per molecule of 44, 48, and 60 A2, using neutron reflection. We have used isotopic labeling to distinguish the hydro...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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1995
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| _version_ | 1826282711306731520 |
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| author | Lyttle, D Lu, J Su, T Thomas, R Penfold, J |
| author_facet | Lyttle, D Lu, J Su, T Thomas, R Penfold, J |
| author_sort | Lyttle, D |
| collection | OXFORD |
| description | We have determined the structure of a monolayer of dodecyltrimethylammonium bromide (C12TAB) adsorbed at the air/water interface at three surface concentrations corresponding to areas per molecule of 44, 48, and 60 A2, using neutron reflection. We have used isotopic labeling to distinguish the hydrocarbon chain; head group, and solvent distributions. We have also labeled the two halves of the hydrocarbon chain to obtain information about the mean conformation of the chain. At the highest surface concentration we find that the inner half of the chain (next to the head group) is oriented closer to the surface normal than surfactant layer is substantially rougher than that predicted from the simple capillary wave model of a pure liquid. Comparison of the thickness of the layer and the separation of the chain and head distributions indicates that the mean orientation of the outer half of the chain is further from the surface normal than is the inner half of the chain, and this difference increases with chain length. At the higher area per molecule the C10TAB forms the thickest layer and this is associated with the chains being closer to the surface normal than for the other CnTABs. |
| first_indexed | 2024-03-07T00:47:58Z |
| format | Journal article |
| id | oxford-uuid:855a747b-71d1-4d1f-b149-986070406f40 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:47:58Z |
| publishDate | 1995 |
| record_format | dspace |
| spelling | oxford-uuid:855a747b-71d1-4d1f-b149-986070406f402022-03-26T21:56:56ZSTRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHSJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:855a747b-71d1-4d1f-b149-986070406f40EnglishSymplectic Elements at Oxford1995Lyttle, DLu, JSu, TThomas, RPenfold, JWe have determined the structure of a monolayer of dodecyltrimethylammonium bromide (C12TAB) adsorbed at the air/water interface at three surface concentrations corresponding to areas per molecule of 44, 48, and 60 A2, using neutron reflection. We have used isotopic labeling to distinguish the hydrocarbon chain; head group, and solvent distributions. We have also labeled the two halves of the hydrocarbon chain to obtain information about the mean conformation of the chain. At the highest surface concentration we find that the inner half of the chain (next to the head group) is oriented closer to the surface normal than surfactant layer is substantially rougher than that predicted from the simple capillary wave model of a pure liquid. Comparison of the thickness of the layer and the separation of the chain and head distributions indicates that the mean orientation of the outer half of the chain is further from the surface normal than is the inner half of the chain, and this difference increases with chain length. At the higher area per molecule the C10TAB forms the thickest layer and this is associated with the chains being closer to the surface normal than for the other CnTABs. |
| spellingShingle | Lyttle, D Lu, J Su, T Thomas, R Penfold, J STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title | STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title_full | STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title_fullStr | STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title_full_unstemmed | STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title_short | STRUCTURE OF A DODECYLTRIMETHYLAMMONIUM BROMIDE LAYER AT THE AIR-WATER-INTERFACE DETERMINED BY NEUTRON REFLECTION - COMPARISON OF THE MONOLAYER STRUCTURE OF CATIONIC SURFACTANTS WITH DIFFERENT CHAIN LENGTHS |
| title_sort | structure of a dodecyltrimethylammonium bromide layer at the air water interface determined by neutron reflection comparison of the monolayer structure of cationic surfactants with different chain lengths |
| work_keys_str_mv | AT lyttled structureofadodecyltrimethylammoniumbromidelayerattheairwaterinterfacedeterminedbyneutronreflectioncomparisonofthemonolayerstructureofcationicsurfactantswithdifferentchainlengths AT luj structureofadodecyltrimethylammoniumbromidelayerattheairwaterinterfacedeterminedbyneutronreflectioncomparisonofthemonolayerstructureofcationicsurfactantswithdifferentchainlengths AT sut structureofadodecyltrimethylammoniumbromidelayerattheairwaterinterfacedeterminedbyneutronreflectioncomparisonofthemonolayerstructureofcationicsurfactantswithdifferentchainlengths AT thomasr structureofadodecyltrimethylammoniumbromidelayerattheairwaterinterfacedeterminedbyneutronreflectioncomparisonofthemonolayerstructureofcationicsurfactantswithdifferentchainlengths AT penfoldj structureofadodecyltrimethylammoniumbromidelayerattheairwaterinterfacedeterminedbyneutronreflectioncomparisonofthemonolayerstructureofcationicsurfactantswithdifferentchainlengths |