Amphitropic liquid crystals: Two lamellar phases in a surfactant containing thermotropic and lyotropic mesogenic groups

S. Fuller, J. Hopwood, A. Rahman, N. Shinde, G. J. Tiddy, G. S. Attard, O. Howell, S. Sproston

Research output: Contribution to journalArticle

22 Citations (Scopus)


We have studied the lyotropic liquid-crystalline behaviour of cationic surfactants containing a potentially thermotropic moiety, a terminal cyanobiphenyloxy group. Both mono-alkyl and mid-chain substituted dialkyl surfactants have been examined using optical microscopy and NMR spectroscopy. Incorporation of the cyanobiphenyloxy group destabilizes the hexagonal and bicontinuous cubic phases, with only an extensive lamellar region being observed. For the dialkyl surfactant there is a range of compositions where two lamellar phases co-exist, one water-rich and the second surfactant-rich.

Original languageEnglish
Pages (from-to)521-529
Number of pages9
JournalLiquid Crystals
Issue number3
Publication statusPublished - 1 May 1992
Externally publishedYes


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