Issue 39, 2011

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

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

Supplementary files

Article information

Article type
Paper
Submitted
08 Jun 2011
Accepted
08 Aug 2011
First published
09 Sep 2011

Phys. Chem. Chem. Phys., 2011,13, 17511-17520

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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