Abstract

Deuterium NMR spectroscopy was applied to study the phase behavior of three nonionic surfactants containing the same alkyl chain length (C13/C15) and increasing numbers of ethoxylate (EO) units (7, 11, and 20). These surfactants were dissolved in D2O, and the quadrupole interaction of the spin of the deuterium nucleus with the protonated surfactant structural units was investigated. The results showed singlets for the liquid normal micelles, for cubic and inverse micellar phases. In contrast, liquid crystalline structures of the hexagonal and lamellar phases showed a powder pattern with a quadrupole splitting. The hexagonal phase showed a smaller splitting than the lamellar phase. By following the quadrupole splittings as a function of surfactant concentration at constant temperature, the phases produced could be clearly identified. In addition, the results showed a gradual transition from hexagonal to lamellar phases, and in some concentration regions, a mixture of the two phases could be inferred from t...

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.