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Issue 39, 2011
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Nonionic diethanolamide amphiphiles with isoprenoid-type hydrocarbon chains: thermotropic and lyotropic liquid crystalline phase behaviour

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Abstract

The thermotropic and lyotropic liquid crystalline phase behaviour of a series of diethanolamide amphiphiles with isoprenoid-type hydrocarbon chains (geranoyl, H-farnesoyl, and phytanoyl) has been investigated. When neat, both H-farnesoyl and phytanoyl diethanolamide form a smectic liquid crystalline structure at sub-zero temperatures. In addition, all three diethanolamides exhibit a glass transition temperature at around −73 °C. Geranoyl diethanolamide forms a lamellar crystalline phase with a lattice parameter of 17.4 Å following long term storage accompanied by the loss of the glass transition. In the presence of water, H-farnesoyl and phytanoyl diethanolamide form lyotropic liquid crystalline phases, whilst geranoyl diethanolamide forms an L2 phase. H-farnesoyl diethanolamide forms a fluid lamellar phase (Lα) at room temperature and up to ∼ 40 °C. Phytanoyl diethanolamide displays a rich mesomorphism forming the inverse diamond (QIID) and gyroid (QIIG) bicontinuous cubic phases in addition to an Lα phase.

Graphical abstract: Nonionic diethanolamide amphiphiles with isoprenoid-type hydrocarbon chains: thermotropic and lyotropic liquid crystalline phase behaviour

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The article was received on 08 Jun 2011, accepted on 08 Aug 2011 and first published on 09 Sep 2011


Article type: Paper
DOI: 10.1039/C1CP21845J
Citation: Phys. Chem. Chem. Phys., 2011,13, 17511-17520
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    Nonionic diethanolamide amphiphiles with isoprenoid-type hydrocarbon chains: thermotropic and lyotropic liquid crystalline phase behaviour

    S. M. Sagnella, C. E. Conn, I. Krodkiewska and C. J. Drummond, Phys. Chem. Chem. Phys., 2011, 13, 17511
    DOI: 10.1039/C1CP21845J

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