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Open AccessArticle

Lipid Monolayers with Adsorbed Oppositely Charged Polyelectrolytes: Influence of Reduced Charge Densities

1
Institut für Physik, Ernst-Moritz-Arndt Universität, Felix-Hausdorff-Straße 6, D-17487 Greifswald, Germany
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Fraunhofer Institute for Applied Polymer Research, Geiselberg Str. 67, D-14476 Potsdam-Golm, Germany
3
Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany
*
Author to whom correspondence should be addressed.
Polymers 2014, 6(7), 1999-2017; https://doi.org/10.3390/polym6071999
Received: 30 April 2014 / Revised: 26 June 2014 / Accepted: 27 June 2014 / Published: 10 July 2014
(This article belongs to the Special Issue Polyelectrolytes 2014)
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. View Full-Text
Keywords: lipid monolayer; polyelectrolyte adsorption; statistical copolymer; two-dimensional phases; surface charge; nematic phase; grazing incidence X-ray diffraction lipid monolayer; polyelectrolyte adsorption; statistical copolymer; two-dimensional phases; surface charge; nematic phase; grazing incidence X-ray diffraction
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Ortmann, T.; Ahrens, H.; Milewski, S.; Lawrenz, F.; Gröning, A.; Laschewsky, A.; Garnier, S.; Helm, C.A. Lipid Monolayers with Adsorbed Oppositely Charged Polyelectrolytes: Influence of Reduced Charge Densities. Polymers 2014, 6, 1999-2017.

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