Primary cathodic steps of electrogenerated chemiluminescence of lanthanide(III) chelates at oxide-covered aluminum electrodes in aqueous solution

Kulmala, Sakari; Kulmala, A.; Ala-Kleme, Timo; Pihlaja, J.

doi:10.1016/s0003-2670(98)00154-8

Cited by 60 publications

(53 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specific examples of other types of metals, which under cathodic polarization will also involve reduction of oxygen to reactive intermediates, include aluminum, 46 copper, 47,48 and stainless steel. 49 Table 8 shows the extent of cathodic delamination of a reference coating without free radical scavengers and an identical coating modified with 3 wt% of free radical scavenger (DBTHQ) for various types of metallic substrates under cathodic polarization.…”

Section: Other Types Of Substratesmentioning

confidence: 99%

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen

Weinell²,

Dam‐Johansen

et al. 2010

J Coat Technol Res

View full text Add to dashboard Cite

Cathodic delamination is one of the major modes of failure for anticorrosive coatings subjected to a physical damage and immersed in seawater. The cause of cathodic delamination has been reported to be the result of a chemical attack at the coating-steel interface by free radicals and peroxides formed as intermediates in the cathodic reaction during the corrosion process. In this study, antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination of epoxy coatings on cold rolled steel. The addition of <5 wt% free radical scavengers to epoxy coatings improved the resistance toward cathodic delamination by up to 50% during seawater immersion, while peroxide decomposers had a limited effect. Testing using substrates prepared from stainless steel, copper, aluminum, galvanized steel, and brass also showed a reduction in the rate of cathodic delamination when the coating was modified with a free radical scavenger. The protective mechanism of free radical scavengers investigated for the primers are similar to that of antioxidants used for protection against photochemical degradation by UV-radiation of top coatings. Both substrate corrosion and degradation of a coating exposed to UV-radiation lead to the formation of free radicals as reactive intermediates.

show abstract

Section: Other Types Of Substratesmentioning

confidence: 99%

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen

Weinell²,

Dam‐Johansen

et al. 2010

J Coat Technol Res

View full text Add to dashboard Cite

show abstract

“…We have earlier shown that some metal chelates such as RuðbpyÞ 2þ 3 [16] and aromatic Tb(III) chelates [17,18], and some organic luminophores as well [19,20] can be excited by cathodic pulse polarization of conductor/insulator/electrolyte (C/I/E) tunnel junction electrodes, e.g., at oxidecoated aluminum, silicon and magnesium electrodes [19,[21][22][23]. These thin insulating film-coated electrodes are known to act as pulsed cold-cathodes and tunnel-emit hot electrons ðe À hot Þ into aqueous solutions in an analogous manner to that occurring in solid-state devices [19,21,22,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, strongly oxidizing species such as sulfate and hydroxyl radicals can be cathodically generated from purposely added coreactants or from dissolved oxygen [19][20][21][22][23]27]. In addition, F + -centers existing in oxide film of C/I/E electrodes may act as oxidants [17,21]. Hence, highly reducing and oxidizing conditions are simultaneously achieved in the vicinity of the electrode surface.…”

Section: Introductionmentioning

confidence: 99%

Hot electron-induced electrochemiluminescence of fluorescein in aqueous solution

Suomi¹,

Ylinen²,

Håkansson³

et al. 2006

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…However, this cannot be the source of the ECL enhancement in the presence of lucigenin, because the changes in the IEL intensity would not be observable in the present experiment (the y-axis of Fig. 3 we have studied [24,32,46] is producing considerable ECL also under F-N tunneling regime.…”

Section: Effect Of Oxide Film Thickness On Eclmentioning

confidence: 66%

“…Sometimes, the time-resolved measurement might be useful, although the luminescence lifetime in the present case is far from those of Tb(III) chelates [46,56,57] .…”

Section: Analytical Applicability Of Eclmentioning

confidence: 97%

Cathodic electrochemiluminescence of lucigenin at disposable oxide-coated aluminum electrodes

Jiang

Håkansson

Suomi

et al. 2006

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Electrogenerated chemiluminescence (ECL) of lucigenin is induced at oxide-coated aluminum electrode in aqueous solution by cathodic pulse polarization. This ECL can be enhanced by the presence of coreactants such as peroxodisulfalte. The present method is based on the injection of hot electrons into the aqueous electrolyte solution, which probably results in the generation of hydrated electrons as reducing mediators.The successive one-electron redox reactions result in the excited states of lucigenin or its fragmentation products. The method can detect lucigenin over several orders of magnitude of concentration with detection limit below nanomolar concentration level.In addition, the relatively long lifetime of the ECL of lucigenin makes time-resolved detection possible. This study suggests that the derivatives of lucigenin can be utilized as electrochemiluminescent labels in aqueous solution in bioaffinity assays at thin insulating film-coated cathodes. The cathodic ECL reaction mechanisms are discussed.

show abstract

Primary cathodic steps of electrogenerated chemiluminescence of lanthanide(III) chelates at oxide-covered aluminum electrodes in aqueous solution

Cited by 60 publications

References 26 publications

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Hot electron-induced electrochemiluminescence of fluorescein in aqueous solution

Cathodic electrochemiluminescence of lucigenin at disposable oxide-coated aluminum electrodes

Contact Info

Product

Resources

About