Volume 75, Number 2, July 2006
|Page(s)||267 - 273|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||16 June 2006|
Non-equilibrium formation of the cubic phase in a monoolein/water system
Institute of Biophysics and X-Ray Structure Research, Austrian Academy of Sciences Schmiedlstraße 6, 8042 Graz, Austria
2 Dipartimento di Scienze Applicate ai Sistemi Complessi, Università Politecnica delle Marche - Via Ranieri 65, 60131 Ancona, Italy
3 Department of Physical Chemistry, Uppsala University PO Box 579, 75123 Uppsala, Sweden
Corresponding author: firstname.lastname@example.org
Accepted: 29 May 2006
Time-resolved small-angle X-ray diffraction experiments have been carried out to investigate the transformation from the cubic gyroid to the cubic diamond phase. The transition was induced by rapid addition of water to a monoolein/water system changing the initial water concentration of 26% w/w to excess of water conditions. The transformation proceeds in two steps: at the beginning, the two cubic mesophases have a strongly differing lipid/water composition and are accompanied by an intermediate phase. This phase vanishes as the ratio of cell parameters exceeds 1.50. Thereafter, the transition continues by a direct nearly isoareal transformation of the cubic minimal surfaces. Lateral area per lipid molecule, molecular shape and principle curvatures are about the same in this regime.
PACS: 61.30.St – Lyotropic phases / 87.15.He – Dynamics and conformational changes / 61.10.Eq – X-ray scattering (including small-angle scattering)
© EDP Sciences, 2006
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