In situ pH responsive fluorescent probing of localized iron corrosion

Liu, Xinjie; Spikes, H. A.; Wong, Janet S.S.

doi:10.1016/j.corsci.2014.06.016

Cited by 23 publications

(18 citation statements)

References 41 publications

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“…With an understanding of these issues, the applicability of pE–pH logic gates in an applied setting is a real possibility. For example, the detection of Fe 3+ under acidic conditions by fluorescence could become a routine method for the early detection of corrosion of ferrous alloys such as steel …”

Section: Figurementioning

confidence: 99%

“…[13] With an understanding of these issues, [10] the applicability of pE-pH logic gates in an applied setting is ar eal possibility.F or example, the detection of Fe 3 + under acidic conditions by fluorescencec ould become ar outine method for the early detection of corrosion of ferrous alloys such as steel. [14] Wu and colleagues have demonstrated an oteworthy logic gate responsive to pH andr edox chemistry. [15] The prototype consisted of ad imethylaniline moiety (protonr eceptor) attached to aP t II complexedt erpyridyl (by av irtual spacer) linked to af errocenyl acetylide (electron donor).…”

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Redox‐Enabled, pH‐Disabled Pyrazoline–Ferrocene INHIBIT Logic Gates

et al. 2017

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Pyrazoline-ferrocene conjugatesw ith an "electron-donorspacer-fluorophore-receptor" format are demonstrated as redox-fluorescent two-input INHIBIT logic gates.Molecular logic-basedc omputation is now firmly established as am aturing research discipline with researchers contemplating pragmatic uses for this curiosity-based science. [1][2][3][4][5] Medicalrelated innovations such as photodynamic photosensitizers, [6] drug delivery systems [7] and multi-analyte diagnostics [8] are but af ew envisioned applications. One of our visions is the realization of logic gates responsive to the physiochemical parameters of pH and potential( pE), which are fundamental to understanding metal ion solubility in geology and metallurgy as well as in medicine. [9] The development of reliable fluorescentc hemosensors and logic gates for open-shell d-metal ions, particularly Fe 3 + ,r equires overcoming several challenges including issues of solubility.[10] The vast majority of studies in this field continuet ob e reported in organic solvents, where Fe 3 + can form aqua-coordinated speciest hat act as unsuspecting weak acids.[11] Consequently,c omplexation or redox chemistry is often inferred, when matter-of-fact the fluorescent response is due to acidbase chemistry.[12] Furthermore, it is commonly taken for granted that in water Fe 3 + hydrolyses to insoluble Fe(OH) 3 above pH 4. [13] With an understanding of these issues, [10] the applicability of pE-pH logic gates in an applied setting is ar eal possibility.F or example, the detection of Fe 3 + under acidic conditions by fluorescencec ould become ar outine method for the early detection of corrosion of ferrous alloys such as steel. [14] Wu and colleagues have demonstrated an oteworthy logic gate responsive to pH andr edox chemistry.[15] The prototype consisted of ad imethylaniline moiety (protonr eceptor) attached to aP t II complexedt erpyridyl (by av irtual spacer) linked to af errocenyl acetylide (electron donor). From ad esign point of view,t his molecule exemplifies am olecular device with an "electron-donor-fluorophore-spacer-receptor" format. The logic gate exhibited an INHIBIT function with H + and Fe 3 + as the inputs and absorbance at 405 nm as the output. The mechanism of operation involved photoinduced electron transfer (PET) from the dimethylaniline unit and am etal-toligand charget ransfer from the ferrocenyl acetylide. Understandably,b eing ap roof-of-concept, the study wasp erformed in acetonitrile.Herein we now presente xamples of pyrazoline-ferrocene conjugates 1-3 with an ovel "electron-donor-spacer-fluorophore-receptor" format for the first time (Figure 1). In contrast to the example by Wu, we illustrate pE-pH INHIBIT logic gates with an ew structuralc onfiguration (the spaceri sl ocated between the electron donor and fluorophore rather than between the fluorophore and receptor) with fluorescencer ather than absorbance as the output and in 1:1( v/v)m ethanol/water rather than in acetonitrile.At the 5-position of the pyrazoline ring, 1-3 have aferrocene (electro...

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Section: Figurementioning

confidence: 99%

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confidence: 99%

Redox‐Enabled, pH‐Disabled Pyrazoline–Ferrocene INHIBIT Logic Gates

et al. 2017

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“…It is widely accepted that oxygen reduction and/or hydrogen reduction reactions occur at the cathode during the pitting corrosion of SS [7][8][9]. The equilibrium electrode potentials of the two reactions are calculated according to the Nernst equation (Equations (11)(12)(13) = −0.0591pH (13) where E e is the equilibrium electrode potential, E θ is the standard electrode potential, R is the constant of molar gas, T is the thermodynamic temperature (298 K), n is the number of electrons participating in the reaction, F is the Faraday constant, aA and aB are the concentration of oxidized and reduced substances, and a and b are the stoichiometric coefficient of substances A and B, respectively. and are the equilibrium electrode potential of oxygen reduction and hydrogen reduction, respectively.…”

Section: Analysis Of Thermodynamic Conditionsmentioning

confidence: 99%

“…E e O and E e H are the equilibrium electrode potential of oxygen reduction and hydrogen reduction, respectively. According to the pH value of the solution shown in Figure 6 and Equations (12) and (13), the equilibrium electrode potential of oxygen and hydrogen reduction is shown in Table 3. Figure 5 and Table 3 show the corrosion potential of 304 SS in solutions with different proportions of Fe 2+ /Fe 3+ .…”

Section: Analysis Of Thermodynamic Conditionsmentioning

confidence: 99%

“…It is known that some corrosion products diffuse to the outside of pits during the growth of corrosion pits [10,11]. The hydrolysis of cations changes the corrosive environment of the passive film outside the pits [12]. Fe 2+ is the main corrosion product in the pitting process of 304 SS, but it is easily oxidized to Fe 3+ [13,14] in electrolytes containing oxidants such as Equation (1).…”

Section: Introductionmentioning

confidence: 99%

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Determination of Iron Valence States Around Pits and the Influence of Fe3+ on the Pitting Corrosion of 304 Stainless Steel

Zhang

Wang

et al. 2020

Materials

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Potassium ferricyanide and potassium ferrocyanide were used to observe and monitor the pitting corrosion of 304 stainless steel (SS) at anodic polarization in situ. The results show that there are Fe3+ ions around the corrosion pit when pitting occurs on 304 SS in NaCl aqueous solution. The effect of Fe3+ surrounded pits on the pitting corrosion was also studied by testing the electrochemical behavior of 304 SS in different Fe3+/Fe2+ solutions. The presence of Fe3+ leads to the positive shift of corrosion potential and the increase of corrosion rate of 304 SS. There are two possible reasons for this phenomenon. On the one hand, Fe3+ hydrolysis results in the decrease of pH value of solution. At the same iron ion concentration, the higher the Fe3+ ion concentration, the lower the solution pH value. On the other hand, Fe3+ may reduce on the electrode surface. The decrease of solution pH and the reduction of Fe3+ resulted in the acceleration of the corrosion rate.

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Electrochemistry and Optical Microscopy

Kanoufi

2021

Encyclopedia of Electrochemistry

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Electrochemistry exploits local current heterogeneities at various scales ranging from the micrometer to the nanometer. The last decade has witnessed unprecedented progress in the development of a wide range of electroanalytical techniques allowing to reveal and quantify such heterogeneity through multiscale and multifonctionnal operando probing of electrochemical processes. However most of these advanced electrochemical imaging techniques, employing scanning probes, suffer from either low imaging throughput or limited imaging size. In parallel, optical microscopies, which can image a wide field of view in a single snapshot, have made considerable progress in terms of sensitivity, resolution and implementation of detection modes. Optical microscopies are then mature enough to propose, with basic bench equipment, to probe in a non destructive way a wide range of optical (and therefore structural) properties of a material in situ, in real time: under operating conditions. They offer promising alternative strategies for quantitative high-resolution imaging of electrochemistry. The first sections recall the optical properties of materials and how they can be probed optically. They discuss fluorescence, Raman, surface plasmon resonance, scattering or refractive index. Then the different optical microscopes used to image electrochemical processes are examined along with some strategies to extract quantitative electrochemical information from optical images. Finally the last section reviews some examples of in situ imaging, at micro-to nanometer resolution, and quantification of electrochemical processes ranging from solution diffusion to the conversion of molecular interfaces or solids.]

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In situ pH responsive fluorescent probing of localized iron corrosion

Cited by 23 publications

References 41 publications

Redox‐Enabled, pH‐Disabled Pyrazoline–Ferrocene INHIBIT Logic Gates

Redox‐Enabled, pH‐Disabled Pyrazoline–Ferrocene INHIBIT Logic Gates

Determination of Iron Valence States Around Pits and the Influence of Fe3+ on the Pitting Corrosion of 304 Stainless Steel

Electrochemistry and Optical Microscopy

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