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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lammertink, Rob
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2024Streamer formation dynamics with mixed bacterial species: effects of cultivation conditions, hydrodynamics, and speciescitations
- 2024Mismatch and mix
- 2022Comparative assessment of hydrocarbon separation performance of bulky poly(urethane-urea)s toward rubbery membranescitations
- 2020Elucidating the effect of chain extenders substituted by aliphatic side chains on morphology and gas separation of polyurethanescitations
- 2019Association of hard segments in gas separation through polyurethane membranes with aromatic bulky chain extenderscitations
- 2017Fabrication of nanoporous graphene/polymer composite membranescitations
- 2015Controlled formation of anatase and rutile TiO2 thin films by reactive magnetron sputteringcitations
- 2015Intrinsic Photocatalytic Assessment of Reactively Sputtered TiO2 Filmscitations
- 2011Hollow fiber ultrafiltration membranes with microstructured inner skincitations
- 2011Carbon nanofibers in catalytic membrane microreactorscitations
- 2010Microstructured hollow fibers for ultrafiltrationcitations
- 2010Shrinkage effects during polmer phase separation on microfabricated moldscitations
- 2010Surface texturing inside ceramic macro/micro channelscitations
- 2010Polymeric microsieves via phase separation microfabricationcitations
- 2009Microcontact Printing of Dendrimers, Proteins, and Nanoparticles by Porous Stampscitations
- 2009Micropatterned polymer films by vapor-induced phase separation using permeable moldscitations
- 2007Morphology and Microtopology of Cation-Exchange Polymers and the Origin of the Overlimiting Currentcitations
- 2006Polymeric microsieves produced by phase separation micromoldingcitations
- 2006Superhydrophobic Surfaces Having Two-Fold Adjustable Roughness Prepared in a Single Stepcitations
- 2005New replication technique for the fabrication of thin polymeric microfluidic devices with tunable porositycitations
- 2005Electrochemistry of Surface-Grafted Stimulus-Responsive Monolayers of Poly(ferrocenyldimethylsilane) on Goldcitations
Places of action
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article
Electrochemistry of Surface-Grafted Stimulus-Responsive Monolayers of Poly(ferrocenyldimethylsilane) on Gold
Abstract
Poly(ferrocenyldimethylsilane)s with various degrees of polymerization and featuring a thiol end group were chemically end-grafted onto gold substrates by self-assembly, forming redox-active monolayers. The monolayers were characterized by contact angle measurements, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Layer thickness values were determined by surface plasmon resonance spectroscopy and ellipsometry. The electrochemical properties of these films in aqueous NaClO4 were studied using cyclic voltammetry (CV), differential pulse voltammetry, chronoamperometry, and chronocoulometry. Cyclic voltammograms showed two reversible redox peaks, indicating a stepwise oxidation of the electroactive sites. The first oxidation step showed reversible behavior at low scan rates and quasi-reversible behavior at higher scan rates. Peak currents (ip) plotted against the square root of scan rates (v1/2) for the first oxidation peak and for the corresponding reduction peak exhibited a linear dependence, indicating that the oxidation process in the first step is controlled by the diffusion of counterions into the polymer film. For the second oxidation peak and the corresponding reduction peak, ip varied linearly with v. This redox behavior is characteristic of surface-immobilized electroactive layers. The higher reversibility of the second oxidation and reduction waves in the CV experiments was explained from the solvation of the surface-grafted poly(ferrocenylsilane) (PFS) chains, which depends on the degree of oxidation. Oxidized PFS films are swollen in the aqueous electrolyte solutions, leading to a higher segmental mobility of the polymer chains and a much increased counterion mobility within the film. Kinetic parameters for the redox processes were obtained from chronocoulometry experiments.