Article ; Online: Influence of molecular structure on the size, shape, and nanostructure of nonionic C(n)E(m) surfactant micelles.
The journal of physical chemistry. B
2014 Volume 118, Issue 1, Page(s) 179–188
Abstract: Nonionic alkyl ethoxylates (C(n)E(m)) have been extensively studied for their adsorption ... of intermixing within the C(n)E(m) micelles in aqueous solution. Data from small angle neutron scattering (SANS ... of micelles formed from the two separate series of surfactants C(n)E6 (n = 10, 12, 14) and C12E(m) (m = 5, 6 ...
Abstract | Nonionic alkyl ethoxylates (C(n)E(m)) have been extensively studied for their adsorption, aggregation, and solubilization individually and in small groups. In this work, we report a more systematic study of the effects of alkyl chain (tail) and ethoxylate (head) length on the size, shape, and extent of intermixing within the C(n)E(m) micelles in aqueous solution. Data from small angle neutron scattering (SANS) and nuclear magnetic resonance (NMR) were combined to undertake the structural characterization of micelles formed from the two separate series of surfactants C(n)E6 (n = 10, 12, 14) and C12E(m) (m = 5, 6, 8, 10, 12). The micellar core volume (V(core)) could be well determined with reasonable accuracy and linked to the hydrophilic-lipophilic balance (HLB) of the surfactant, with a sharp size and shape transition occurring around HLB = 12.5. NOESY NMR results revealed protrusions of the terminal methylene groups into the ethoxylate shell, thus providing direct experimental evidence for the phenomenon of "roughness" or intermixing of the core-shell interface. These detailed studies are compared with previous investigations on this model surfactant system. |
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MeSH term(s) | Micelles ; Molecular Structure ; Nanostructures/chemistry ; Particle Size ; Surface Properties ; Surface-Active Agents/chemistry |
Chemical Substances | Micelles ; Surface-Active Agents |
Language | English |
Publishing date | 2014-01-09 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ISSN | 1520-5207 |
ISSN (online) | 1520-5207 |
DOI | 10.1021/jp409808c |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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