Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface
Specular neutron reflection, together with isotopic substitution has been used to determine the structure of the mixed surfactant monolayer of hexadecyltrimethylammonium bromide (C16TAB) and monododecyl hexaethylene glycol (C12E6) adsorbed at the air/water interface. The measurements have been made...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
1996
|
| _version_ | 1826281881195249664 |
|---|---|
| author | Penfold, J Staples, E Cummins, P Tucker, I Thomas, R Simister, E Lu, JR |
| author_facet | Penfold, J Staples, E Cummins, P Tucker, I Thomas, R Simister, E Lu, JR |
| author_sort | Penfold, J |
| collection | OXFORD |
| description | Specular neutron reflection, together with isotopic substitution has been used to determine the structure of the mixed surfactant monolayer of hexadecyltrimethylammonium bromide (C16TAB) and monododecyl hexaethylene glycol (C12E6) adsorbed at the air/water interface. The measurements have been made at a range of surfactant compositions and concentrations [both below and above the critical micellar concentration, (c.m.c.)] and at different temperatures, all in the presence of 0.1 mol 1-1 sodium bromide. The structure of the cationic surfactant in the mixed layer is similar to that of a pure C16TAB layer at an equivalent area per molecule. Whereas, although the alkyl chain extension of C12E6 is similar in both pure and mixed monolayers, the molecule is more immersed in the solvent in the mixed monolayer. The midpoint of the alkyl chain distribution for the non-ionic surfactant is further from the solvent interface than that of the cationic surfactant. However, the midpoints of the distributions for the entire molecules coincide. Over the concentration range studied the structure is independent of composition and depends only on the amount adsorbed. Some differences in the structure with increasing temperature, associated with temperature driven dehydration of the surfactants, are observed. |
| first_indexed | 2024-03-07T00:35:28Z |
| format | Journal article |
| id | oxford-uuid:813e86e2-23a1-48de-8579-dc351614f8cb |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:35:28Z |
| publishDate | 1996 |
| record_format | dspace |
| spelling | oxford-uuid:813e86e2-23a1-48de-8579-dc351614f8cb2022-03-26T21:29:06ZStructure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interfaceJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:813e86e2-23a1-48de-8579-dc351614f8cbEnglishSymplectic Elements at Oxford1996Penfold, JStaples, ECummins, PTucker, IThomas, RSimister, ELu, JRSpecular neutron reflection, together with isotopic substitution has been used to determine the structure of the mixed surfactant monolayer of hexadecyltrimethylammonium bromide (C16TAB) and monododecyl hexaethylene glycol (C12E6) adsorbed at the air/water interface. The measurements have been made at a range of surfactant compositions and concentrations [both below and above the critical micellar concentration, (c.m.c.)] and at different temperatures, all in the presence of 0.1 mol 1-1 sodium bromide. The structure of the cationic surfactant in the mixed layer is similar to that of a pure C16TAB layer at an equivalent area per molecule. Whereas, although the alkyl chain extension of C12E6 is similar in both pure and mixed monolayers, the molecule is more immersed in the solvent in the mixed monolayer. The midpoint of the alkyl chain distribution for the non-ionic surfactant is further from the solvent interface than that of the cationic surfactant. However, the midpoints of the distributions for the entire molecules coincide. Over the concentration range studied the structure is independent of composition and depends only on the amount adsorbed. Some differences in the structure with increasing temperature, associated with temperature driven dehydration of the surfactants, are observed. |
| spellingShingle | Penfold, J Staples, E Cummins, P Tucker, I Thomas, R Simister, E Lu, JR Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title | Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title_full | Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title_fullStr | Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title_full_unstemmed | Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title_short | Structure of the mixed cationic-non-ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air/water interface |
| title_sort | structure of the mixed cationic non ionic surfactant monolayer of hexadecyltrimethylammonium bromide and monododecyl hexaethylene glycol at the air water interface |
| work_keys_str_mv | AT penfoldj structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT staplese structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT cumminsp structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT tuckeri structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT thomasr structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT simistere structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface AT lujr structureofthemixedcationicnonionicsurfactantmonolayerofhexadecyltrimethylammoniumbromideandmonododecylhexaethyleneglycolattheairwaterinterface |