Influence of the polymer charge density on lipid-polyelectrolyte complexes at the air/water-interface

Meijere, Kerstin de and Brezesinski, Gerald and Pfohl, Thomas and Möhwald, Helmuth. (1999) Influence of the polymer charge density on lipid-polyelectrolyte complexes at the air/water-interface. Journal of Physical Chemistry B, 103 (42). pp. 8888-8893.

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Coupling of a polyelectrolyte to a charged lipid monolayer changes the interplay between the lateral forces within the monolayer and the entropic forces in the polymer. This results in structure changes in the monolayer region. Charge dilution within the polymer can help to evaluate the role of electrostatic attraction. The structure of a negatively charged phosphatidic acid monolayer complexed with copolymers consisting of the positively charged diallyldimethylammoniumchloride and the neutral acrylamide in different ratios was studied by grazing incidence X-ray diffraction. Ellipsometry measurements were used to determine the thickness of the adsorption layers. Lipid−polyelectrolyte complexes exhibit rectangular lattices at low pressures. The tilt angles of the molecular chains relative to the surface normal decrease with decreasing charge of the polyelectrolyte. In a complex with 21% polymer charge, a transition to a hexagonal phase is observed at 35 mN/m. The oblique lattice of the DPPA monolayer on water is suppressed in all systems. The adsorption layer, consisting of ∼ 85% water, gets thicker with decreasing polymer charge. This is a result of the formation of loops and tails.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > Biophysikalische Chemie (Pfohl)
UniBasel Contributors:Pfohl, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 Apr 2017 09:45
Deposited On:21 Dec 2016 09:52

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