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

doi:10.1080/02678299208031065

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 journal › Article › peer-review

24 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	521-529
Number of pages	9
Journal	Liquid Crystals
Volume	12
Issue number	3
DOIs	https://doi.org/10.1080/02678299208031065
Publication status	Published - 1 May 1992
Externally published	Yes

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AU - Fuller, S.

AU - Hopwood, J.

AU - Rahman, A.

AU - Shinde, N.

AU - Tiddy, G. J.

AU - Attard, G. S.

AU - Howell, O.

AU - Sproston, S.

PY - 1992/5/1

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N2 - 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.

AB - 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.

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

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