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Pore formation in a stacked bilayer system induced by the addition of the peptide melittin
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical Chemistry.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-92237OAI: oai:DiVA.org:uu-92237DiVA: diva2:165239
Available from: 2004-10-08 Created: 2004-10-08 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Electrochemical Studies of Redox Properties and Diffusion in Self-Assembled Systems
Open this publication in new window or tab >>Electrochemical Studies of Redox Properties and Diffusion in Self-Assembled Systems
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis electron transfer reactions and diffusion of redox molecules in three different types of self-aggregated structures are investigated. Electrochemistry was used to investigate the redox potential and diffusion coefficients for redox active molecules with different polarity. The first aggregate system studied was the micellar phase. The role of electrostatic interactions in the stability of an amphiphilic viologen was investigated for differently charged micelles. It was concluded that the electrostatic environment changed the redox potential of the viologen. In differently charged micelles the redox potential was more negative compared to when the viologen was situated in micelles with the same charge.

The second structure investigated is a very fascinating phase, the bicontinuous cubic phase, with its continuous channels of water and an apolar bilayer. Its domains with different polarity made it possible to solvate both hydrophilic and hydrophobic molecules. An amphiphilic molecule will have its head-group at the interface between the apolar and polar part, and can move lateral within the bilayer. All molecules investigated made contact with and reacted at the surface of the electrode. The diffusion of water bound species diffusing in the water channels was 3-4 times slower than in water. Hydrophobic and amphiphilic molecules were much more hindered, probably because the cubic phase was not defect free.

The third kind of structure studied was a lamellar system. This phase is built up from planar bilayers that are stacked with a repeating distance and with water in between. A hydrophilic molecule was severely hindered to move in the direction perpendicular to the bilayer plane. Upon addition of the peptide melittin the current increased, due to pore formation in the bilayer.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 69 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1024
Physical chemistry, electrochemistry, self-assembly, bicontinuos cubic phase, redox potential, diffusion, Fysikalisk kemi
National Category
Physical Chemistry
urn:nbn:se:uu:diva-4613 (URN)91-554-6059-3 (ISBN)
Public defence
2004-10-29, B22, BMC, Husargatan 3, Uppsala, 10:15
Available from: 2004-10-08 Created: 2004-10-08Bibliographically approved

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