NMR self-diffusion measurements in inverse micellar cubic phases
| Autor: | P. Sotta, John M. Seddon, Y. Dutheillet, Y. Hendrikx, E. A. Bartle |
|---|---|
| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Liquid Crystals. 16:893-903 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678299408027860 |
| Popis: | We have measured self-diffusion coefficients of amphiphile and water molecules in novel inverse micellar lyotropic cubic phases using the pulsed field gradient NMR technique. We investigated two different ternary lyotropic systems: oleic acid/sodium oleate/water, and dioleoylglycerol/dioleoylphosphatidylcholine/water. Both of these systems have previously been shown by one of us to form a cubic phase of space group Fd3m, whose structure is a complex packing of two types of disconnected quasi-spherical inverse micelles embedded in a 3D hydrocarbon matrix. The amphiphile translational diffusion coefficients determined for the first time by 1H NMR in both systems are surprisingly large. Thus the self diffusion coefficients of amphiphiles may not provide a reliable way of distinguising inverse micellar from inverse bicontinuous phases. The water self-diffusion coefficient has been determined to have a value of 2·4 × 10−12 m2 s−1, a value which is more than two orders of magnitude lower than that typi... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|