Journal Article

DESY-2014-03035

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Lipid Monolayers with Adsorbed Oppositely Charged Polyelectrolytes: Influence of Reduced Charge Densities

Ortmann, D. (Corresponding Author)Extern* ; Ahrens, H.Extern* ; Milewski, S. ; Lawrenz, F.Extern* ; Groening, A.Extern* ; Laschewsky, A. ; Garnier, S. ; Helm, C. A.Extern*

2014
MDPI Basel

This record in other databases:    

Please use a persistent id in citations: doi:10.3390/polym6071999

Abstract: Polyelectrolytes in dilute solutions (0.01 mmol/L) adsorb in a two-dimensional lamellar phase to oppositely charged lipid monolayers at the air/water interface. The interchain separation is monitored by Grazing Incidence X-ray Diffraction. On monolayer compression, the interchain separation decreases to a factor of two. To investigate the influence of the electrostatic interaction, either the line charge density of the polymer is reduced (a statistic copolymer with 90% and 50% charged monomers) or mixtures between charged and uncharged lipids are used (dipalmitoylphosphatidylcholine (DPPC)/ dioctadecyldimethylammonium bromide (DODAB)) On decrease of the surface charge density, the interchain separation increases, while on decrease of the linear charge density, the interchain separation decreases. The ratio between charged monomers and charged lipid molecules is fairly constant; it decreases up to 30% when the lipids are in the fluid phase. With decreasing surface charge or linear charge density, the correlation length of the lamellar order decreases.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. DORIS Beamline BW1 (POF2-54G13) (POF2-54G13)

Experiment(s):

1. DORIS Beamline BW1 (DORIS III)

Appears in the scientific report 2014

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Database coverage:
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