Properties of Mixed Alcohol−Zwitterionic Surfactant Films in Quaternary Water-in-Oil Microemulsions

Contrast variation small-angle neutron scattering (SANS) has been employed to study the droplet structure and adsorbed layer composition of water-in-n-octane microemulsions, stabilized by alcohol−zwitterionic surfactant (1,2-n-octanoyl-sn-glycero-3-phosphocholine or PC8) mixtures. The role of coadso...

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Published in:Langmuir 2003-09, Vol.19 (18), p.7219-7225
Main Authors: Bumajdad, Ali, Eastoe, Julian
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Language:English
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description Contrast variation small-angle neutron scattering (SANS) has been employed to study the droplet structure and adsorbed layer composition of water-in-n-octane microemulsions, stabilized by alcohol−zwitterionic surfactant (1,2-n-octanoyl-sn-glycero-3-phosphocholine or PC8) mixtures. The role of coadsorbed alcohol was investigated by systematically varying the chain length N alc (5, n-pentanol; 6, n-hexanol; 8, n-octanol) under conditions where the interface would be “saturated” with added alcohol. The SANS intensities are consistent with spherical nanodroplets and a progressive decrease in mixing of alcohol into the film with increasing alcohol chain length N alc. These scattering data have also been analyzed to provide estimates for film bending energies in terms of the sum of moduli 2K + K bar, which is found to be an increasing function of N alc. These results quantify the interfacial partitioning of alcohols and highlight the effects of chain length on interfacial compositions and stability.
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title Properties of Mixed Alcohol−Zwitterionic Surfactant Films in Quaternary Water-in-Oil Microemulsions
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