Electrochemical behaviour of poly(pyrrole) coatings on steel

Koene, L.; Hamer, Walter J.; Wit, J.H.W. de

doi:10.1007/s10800-005-9104-9

Cited by 46 publications

(31 citation statements)

References 49 publications

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“…As discussed earlier, a number of previous studies have used equivalent circuit modeling to interpret the impedance response of bioelectrodes and CPs [28][29][30]32,33]. In this study, a more in details equivalent circuit model is proposed to characterize impedance of the electrode-CPelectrolyte interface.…”

Section: Equivalent Circuit Modelingmentioning

confidence: 99%

Experimental and theoretical characterization of implantable neural microelectrodes modified with conducting polymer nanotubes

2008

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Neural prostheses transduce bioelectric signals to electronic signals at the interface between neural tissue and neural microelectrodes. A low impedance electrode-tissue interface is important for the quality of signal during recording as well as quantity of applied charge density during stimulation. However, neural microelectrode sites exhibit high impedance because of their small geometric surface area. Here we analyze nanostructured-conducting polymers that can be used to significantly decrease the impedance of microelectrode typically by about two orders of magnitude and increase the charge transfer capacity of microelectrodes by three orders of magnitude. In this study poly (pyrrole) (PPy) and poly(3, 4-ethylenedioxythiophene) (PEDOT) nanotubes were electrochemically polymerized on the surface of neural microelectrode sites (1250 μm 2 ). An equivalent circuit model comprising a coating capacitance in parallel with a pore resistance and interface impedance in series was developed and fitted to experimental results to characterize the physical and electrical properties of the interface. To confirm that the fitting parameters correlate with physical quantities of interface, theoretical equations were used to calculate the parameter values thereby validating the proposed model. Finally, an apparent diffusion coefficient was calculated for PPy film (29.2 ± 1.1 cm 2 /s), PPy nanotubes (72.4 ± 3.3 cm 2 /s), PEDOT film (7.4 ± 2.1 cm 2 /s), and PEDOT nanotubes (13.0 ± 1.8 cm 2 /s). The apparent diffusion coefficient of conducting polymer nanotubes was larger than the corresponding conducting polymer films.

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Section: Equivalent Circuit Modelingmentioning

confidence: 99%

Experimental and theoretical characterization of implantable neural microelectrodes modified with conducting polymer nanotubes

2008

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“…Fig. 4b presents the actual Fe 3 O 4 /PPy mass ratio in the film for each experiment where the mass of Fe 3 O 4 was calculated assuming that the incorporation of magnetite particles does not modify the electropolymerization rate of Py and taking the mass of pure PPy as reference [13,25]. It can be seen that when the amount of Fe 3 O 4 was increased in the electrolyte, the amount of Fe 3 O 4 incorporated also increased in the polymer matrix, even though not in a linear way as for a 0.75 Fe 3 O 4 /Py mass ratio in the solution; only a 0.25 Fe 3 O 4 /PPy mass ratio in the film was obtained.…”

Section: Morphologymentioning

confidence: 99%

Evidence of redox interactions between polypyrrole and Fe3O4 in polypyrrole–Fe3O4 composite films

Montoya

Jaramillo

Calderón

et al. 2010

Electrochimica Acta

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“…Uniaxial and biaxial deformations can cause surface damage to the polymer coating, hence decreasing its protection capacity, [5] and can generate loss of adherence between layers, [6] consequently affecting the performance of composites. Thus, this work is particularly concerned with the presence of uniaxial deformations, which are not common in the manufacturing of canning materials, but still can appear in ridges on the bottom of non-cylindrical steel plates.…”

Section: Introductionmentioning

confidence: 99%

Degradation of metal–polymer composite submitted to uniaxial deformations in 3.5% NaCl solution

Zumelzu¹,

Asomavich²,

Cabezas³

et al. 2013

Journal of Adhesion Science and Technology

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This research evaluated the degradation performance of metal-polymer laminates. The material employed was an electrolytic chromium-coated steel (ECCS) sheet, protected by polyethylene teraphthalate (PET). This composite was submitted to uniaxial deformations simulating those occurring in the formation of containers. Later, it was electrochemically tested in 3.5% NaCl w/v solution and characterised by scanning electron microscope (SEM). Finally, an evaluation of the degradation activity was made to determine the potential performance of the composite in canning applications. The results indicated that the deformation-degradation correlations of the layers depended on the plastic deformation, strain energy, surface quality of the PET polymer free from defects (with respect to a control sample), lack of continuity of the chromium oxide layer at the interface level due to the generation of microcracks, grain deformation in the metallic layers -both of ECCS and chromium layer -due to the generation of Lüder's bands, loss of adherence detected by electrochemical tests and surface morphological changes of the protective polymer by uniaxial deformations.

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Electrochemical behaviour of poly(pyrrole) coatings on steel

Cited by 46 publications

References 49 publications

Experimental and theoretical characterization of implantable neural microelectrodes modified with conducting polymer nanotubes

Experimental and theoretical characterization of implantable neural microelectrodes modified with conducting polymer nanotubes

Evidence of redox interactions between polypyrrole and Fe3O4 in polypyrrole–Fe3O4 composite films

Degradation of metal–polymer composite submitted to uniaxial deformations in 3.5% NaCl solution

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