High-resolution NMR characterization of a gel-like surfactant mesophase
Document Type
Article
Date of Original Version
9-2-2008
Abstract
The addition of phosphatidylcholine to AOT water-in-oil microemulsions leads to the formation of a rigid gel as the water content is increased above a specific threshold. This system is a gel-like crystalline phase where the microstructure evolves from reverse hexagonal to lamellar with increasing water content and/or temperature. Couette sheared 1H and 31P NMR experiments carried out at varying temperature and water content show distinct signatures with microstructure evolution. Because the system has been fully characterized through small-angle neutron scattering, it is possible to relate the NMR signatures to the microstructure. The NMR technique therefore complements scattering techniques but is additionally useful because the technique also picks up isotropic signatures from concurrently occurring noncrystalline phases. The use of NMR to identify such lyotropic gel-like crystalline phases allows easy correlation between templated materials synthesis in these phases and phase microstructure. NMR can therefore be used as a probe to understand microstructure in specific surfactant systems and to characterize the retention of microstructure during materials synthesis. © 2008 American Chemical Society.
Publication Title, e.g., Journal
Langmuir
Volume
24
Issue
17
Citation/Publisher Attribution
Liu, Limin, Grace Tan, Gary McPherson, Vijay T. John, Karol Maskos, and Arijit Bose. "High-resolution NMR characterization of a gel-like surfactant mesophase." Langmuir 24, 17 (2008): 9286-9294. doi: 10.1021/la801130w.