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

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

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 Creators:
Sterthaus, R.1, Author           
Wegner, Gerhard1, Author           
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 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.

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Language(s): eng - English
 Dates: 2002-07-09
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28691
ISI: 000176627000016
Other: P-02-69
 Degree: -

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Title: Langmuir
  Alternative Title : Langmuir
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 18 (14) Sequence Number: - Start / End Page: 5414 - 5421 Identifier: ISSN: 0743-7463