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Ultrathin layers of polyelectrolytes on mica: Preparation, characterization, and electrokinetic surface potential

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons48806

Sterthaus,  R.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48973

Wegner,  Gerhard
MPI for Polymer Research, Max Planck Society;

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Citation

Sterthaus, R., & Wegner, G. (2002). Ultrathin layers of polyelectrolytes on mica: Preparation, characterization, and electrokinetic surface potential. Langmuir, 18(14), 5414-5421.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-659D-F
Abstract
We report on the preparation of ultrathin polyelectrolyte network films on solid substrates, particularly on mica. This supramolecular construct serves as a useful model of ionogenic surfaces in materials science or biological contexts. The polyelectrolyte network films were prepared from photo-cross- linkable copolymers which in turn were synthesized from 3- (dimethyl-maleinimidopropyl) methacrylate (DMIMA) and tertbutyl methacrylate (tBMA) via radical copolymerization. DMIMA gives rise to photo-cross-linkable sites in the copolymer. Ultrathin multilayered films are prepared with P[tBMA-co-DMIMA] by the Langmuir-Blodgett (LB) technique with mica as the substrate. The mica surface was hydrophobized by a monolayer of cetyltrimethylammonium. bromide self-assembled from aqueous solution, Two subsequent reactions were performed with the LB films: cross-linking by irradiation with UV light to fix the morphology of the film; subsequent acidolysis by gaseous HCl to convert the construct into a polyelectrolyte film. Its thickness was determined by small-angle X-ray reflectometry, and the surface structure by AFM. The electrokinetic potential (zeta potential) at the polyelectrolyte/aqueous solution interface was determined by measuring the electroosmotic mobility of the solution near the surface. Following the formalism of the Einstein-Smoluchowski equation, a zeta potential of -50 mV was determined at zero concentration of added electrolyte and neutral pH.