X-ray diffraction study of the intermediate phases formed by sodium dodecylsulphate in aqueous mixtures ofN-methylformamide
- 1 July 1994
- journal article
- research article
- Published by Taylor & Francis in Liquid Crystals
- Vol. 17 (1) , 109-126
- https://doi.org/10.1080/02678299408036552
Abstract
We report the sequence of intermediate phases formed by sodium dodecylsulphate (SDS) in water on addition of N-methylformamide (NMF). Although only a single phase, Lα, is formed in the SDS/NMF system, the three sequences Hα ⇔ Mα ⇔ Rα, Hα ⇔ Mα ⇔ Qα and Hα ⇔ Qα (Ia3d) were observed with increase in concentration of NMF in the SDS/water/NMF mixtures. The sequences Hα ⇔Qα and Hα ⇔ Lα were identified in the water/NMF mixture, although they were not observed in the initial SDS/water system or in the SDS/NMF system. These results indicate that solvent mixtures could be profitably employed to investigate the conditions of formation of intermediate phases and to study the transitions of the Hα → Mα → Rα to the Hα → Mα → Qα sequences.Keywords
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