X-Ray Diffraction and NMR Studies on Mixtures of Non-Ionic Surfactant (C_{12}EO_{2}) and Phospholipids (POPC)

• Authors: S.S. Funari , C. di Vitta , G. Rapp
• Languages of publication: EN

Abstracts

EN

We studied the temperature and concentration dependence of the POPC/C_{12}EO_{2}/water ternary system and identified and characterized the different phases occurring. The thermal behaviour is slightly dependent on the surfactant to lipid molar ratio R_{s/l}. At low surfactant content the behaviour is similar to the binary lipid/water system. Similarly at low lipid contents the system behaves similarly to the surfactant/water mixture. However, at molar ratios R_{s/l} between 2 and 3 a new hexagonal phase forms which is peculiar to the mixture. ^{2}H NMR measurements indicated the existence of a lamellar phase containing also curved surfaces additional to the flat ones. The surface area per surfactant molecule was calculated to 0.23 nm^{2} which is in good agreement with the cross-section of a paraffinic chain.

Keywords

EN

87.10.+e

• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 91
• Issue: 5
• Pages: 953-960

Dates

published

1997-05

Contributors

author

S.S. Funari

• Universität Leipzig, Fachbereich Physik, Linnéstraße 5, 04103 Leipzig, Germany

author

C. di Vitta

• Institute of Chemistry, University of Sao Paulo, CP 26077, 05599-970 Sao Paulo SP, Brazil

author

G. Rapp

• European Molecular Biology Laboratory - EMBL, Outstation at DESY, Notkestraße 85, 22603 Hamburg, Germany