X-ray photoelectron spectroscopy and electrochemical studies of mild steel FeE500 passivation in concrete simulated water

In the present study, the inhibition performance of two synthesized hydrazone derivatives (HDZs), namely, (E)-N′-(2,4-dimethoxybenzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (HYD-1) and N′-cyclohexylidene-2-(6-methoxynaphthalen-2-yl) propanehydrazide (HYD-2) on mild steel (MS) in 1.0 M HCl was investigated using weight loss measurements, electrochemical techniques, and scanning electron microscope (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX). The experimental data suggested that the hydrazone derivatives exhibited a high inhibition performance, which increases with increasing their concentrations. HYD-1 and HYD-2 presented maximum inhibition efficiencies of 96% and 84%, respectively, at an optimal concentration of 5 × 10–3 M. The principal observations that resulted from electrochemical studies are that HYDs affected both anodic and cathodic reactions (mixed inhibitors). Their adsorption, which is a combination of chemisorption and physisorption, obeyed the Langmuir isotherm model. Furthermore, the temperature effect was carried out at various temperatures ranging from 303 to 333 K to verify the corrosion inhibition performance of HYD-1 at higher temperatures. Moreover, SEM-EDX analysis confirmed that HYDs can ensure remarkable prevention against corrosion through the adsorption onto the metal surface.

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XPS and Electrochemical Studies on Tungsten-Oxidizer Interaction in Chemical Mechanical Polishing

MRS Proceedings ◽

10.1557/proc-566-89 ◽

1999 ◽

Vol 566 ◽

Cited By ~ 2

Author(s):

Dnyanesh Tamboli ◽

Sudipta Seal ◽

Vimal Desai

Keyword(s):

Photoelectron Spectroscopy ◽

Chemical Mechanical Polishing ◽

Material Removal ◽

Electrochemical Measurements ◽

Electrochemical Studies ◽

Removal Mechanism ◽

Tungsten Oxides ◽

X Ray ◽

Static Solutions

Electrochemical interaction between the oxidizer and the metal is believed to play a key role in material removal in tungsten CMP. In this study, we use X-ray Photoelectron Spectroscopy (XPS) in conjunction with electrochemical measurements in both in-situ polishing conditions as well as in static solutions, to identify the passivation and dissolution modes of tungsten. Dissolution of tungsten oxides was found to be the primary non-mechanical tungsten removal mechanism in CMP.

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Investigations on the Electrochemical Atomic Layer Growth of Bi2Se3 and the Surface Limited Deposition of Bismuth at the Silver Electrode

Materials ◽

10.3390/ma11081426 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1426 ◽

Cited By ~ 1

Author(s):

Walter Giurlani ◽

Andrea Giaccherini ◽

Nicola Calisi ◽

Giovanni Zangari ◽

Emanuele Salvietti ◽

...

Keyword(s):

Atomic Layer Deposition ◽

Ultrathin Films ◽

Photoelectron Spectroscopy ◽

Atomic Layer ◽

Layer Growth ◽

Electrochemical Studies ◽

Optimal Conditions ◽

X Ray ◽

Layer Deposition ◽

Controlled Deposition

The Electrochemical Atomic Layer Deposition (E-ALD) technique is used for the deposition of ultrathin films of bismuth (Bi) compounds. Exploiting the E-ALD, it was possible to obtain highly controlled nanostructured depositions as needed, for the application of these materials for novel electronics (topological insulators), thermoelectrics and opto-electronics applications. Electrochemical studies have been conducted to determine the Underpotential Deposition (UPD) of Bi on selenium (Se) to obtain the Bi2Se3 compound on the Ag (111) electrode. Verifying the composition with X-ray Photoelectron Spectroscopy (XPS) showed that, after the first monolayer, the deposition of Se stopped. Thicker deposits were synthesized exploiting a time-controlled deposition of massive Se. We then investigated the optimal conditions to deposit a single monolayer of metallic Bi directly on the Ag.

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Synthesis and Reactivity of (N2P2)Ni Complexes Stabilized by a Novel Diphosphonite Pyridinophane Ligand

10.26434/chemrxiv.13514434.v1 ◽

2021 ◽

Author(s):

Kei Fuchigami ◽

Michael B. Watson ◽

Giang N. Tran ◽

Nigam P. Rath ◽

Liviu M. Mirica

Keyword(s):

Photoelectron Spectroscopy ◽

Aryl Halide ◽

Bond Formation ◽

Cross Coupling ◽

Electrochemical Studies ◽

Redox Potentials ◽

Efficient Catalyst ◽

X Ray ◽

Ni Species

A series of (N2P2)NiII complexes (N2P2 = P,P’-ditertbutyl-2,11-diphosphonito[3.3](2,6)pyridinophane) stabilized by a modified tetradentate pyridinophane ligand containing two phosphonite groups were synthesized and characterized. Cyclic voltammetry (CV) studies revealed the accessibility of the NiI oxidation state at moderate redox potentials for these NiII complexes. In situ EPR, low-temperature UV-vis, and electrochemical studies were employed to detect the formation of NiI species during the reduction of NiII precursors. Furthermore, the [(N2P2)NiI(CNtBu)](SbF6) complex was isolated upon reduction of the NiII precursor with 1 equiv of CoCp2, and was characterized by EPR and X-ray photoelectron spectroscopy (XPS). Finally, the (N2P2)NiIIBr2 complex acts as an efficient catalyst for the Kumada cross-coupling of an aryl halide with an aryl or alkyl Grignard, suggesting that the N2P2 ligand can support the various Ni species involved in the catalytic C-C bond formation reactivity.

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Electrochemical Studies of Corrosion of Sinfuel: Simulated Used UO2 Fuel

MRS Proceedings ◽

10.1557/proc-294-35 ◽

1992 ◽

Vol 294 ◽

Author(s):

S. Sunder ◽

D.W. Shoesmith ◽

N.H. Miller

Keyword(s):

Photoelectron Spectroscopy ◽

Electrochemical Techniques ◽

Open Circuit ◽

Electrochemical Studies ◽

Dissolved Oxygen Concentration ◽

Solution Ph ◽

X Ray ◽

Uranium Oxidation ◽

Uranium Fuel ◽

Short Times

ABSTRACTThe corrosion of SIMFUEL, simulated high-burnup CANDU (CANadian Deuterium Uranium) fuel, was investigated in 0.1 mol·dm−3 NaClO4 solution (pH ∼ 9.5) as a function of dissolved oxygen concentration using electrochemical techniques and X-ray photoelectron spectroscopy (XPS). Electrodes were constructed of SIMFUEL pellets with compositions close to those of a natural UO2 fuel that has undergone burnup of 3 at% and 6 at%. The XPS analysis of freshly polished SIMFUEL pellets showed that the extent of uranium oxidation in SIMFUEL was equivalent to that in stoichiometric UO2. The SIMFUEL electrodes showed higher conductivity and electrochemical reactivity than the pure UO2 electrodes. A comparison of the open circuit corrosion potentials of the SIMFUEL electrodes with that of a pure UO2 electrode in oxygenated solutions showed a much faster increase in the potential for the SIMFUEL electrodes at short times. This suggests that the initial stages of UO2 oxidation, i.e., UO2 → UO2+x → UO2.33, are facilitated by fission product impurities in the UO2 matrix. However, the “steady-state” oxidation of uranium in SIMFUEL by the dissolved O2 was similar to that observed in pure UO2 under similar conditions.

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Surface analysis using X-ray photoelectron spectroscopy of iodine deposits on 17% Cr/12% Ni and mild steel surfaces oxidised in gas mixtures

Journal of Nuclear Materials ◽

10.1016/0022-3115(89)90463-7 ◽

1989 ◽

Vol 161 (1) ◽

pp. 72-88 ◽

Cited By ~ 7

Author(s):

J.W Tyler

Keyword(s):

Mild Steel ◽

Surface Analysis ◽

Photoelectron Spectroscopy ◽

Gas Mixtures ◽

X Ray ◽

Steel Surfaces

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Electrostatic immobilization of polyoxometallates on silicon: X-ray Photoelectron Spectroscopy and electrochemical studies

Thin Solid Films ◽

10.1016/j.tsf.2011.01.341 ◽

2011 ◽

Vol 519 (11) ◽

pp. 3732-3738 ◽

Cited By ~ 11

Author(s):

Benoit Fleury ◽

Martial Billon ◽

Florence Duclairoir ◽

Lionel Dubois ◽

Aurélien Fanton ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Electrochemical Studies ◽

X Ray

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Synthesis and Reactivity of (N2P2)Ni Complexes Stabilized by a Novel Diphosphonite Pyridinophane Ligand

10.26434/chemrxiv.13514434 ◽

2021 ◽

Author(s):

Kei Fuchigami ◽

Michael B. Watson ◽

Giang N. Tran ◽

Nigam P. Rath ◽

Liviu M. Mirica

Keyword(s):

Photoelectron Spectroscopy ◽

Aryl Halide ◽

Bond Formation ◽

Cross Coupling ◽

Electrochemical Studies ◽

Redox Potentials ◽

Efficient Catalyst ◽

X Ray ◽

Ni Species

A series of (N2P2)NiII complexes (N2P2 = P,P’-ditertbutyl-2,11-diphosphonito[3.3](2,6)pyridinophane) stabilized by a modified tetradentate pyridinophane ligand containing two phosphonite groups were synthesized and characterized. Cyclic voltammetry (CV) studies revealed the accessibility of the NiI oxidation state at moderate redox potentials for these NiII complexes. In situ EPR, low-temperature UV-vis, and electrochemical studies were employed to detect the formation of NiI species during the reduction of NiII precursors. Furthermore, the [(N2P2)NiI(CNtBu)](SbF6) complex was isolated upon reduction of the NiII precursor with 1 equiv of CoCp2, and was characterized by EPR and X-ray photoelectron spectroscopy (XPS). Finally, the (N2P2)NiIIBr2 complex acts as an efficient catalyst for the Kumada cross-coupling of an aryl halide with an aryl or alkyl Grignard, suggesting that the N2P2 ligand can support the various Ni species involved in the catalytic C-C bond formation reactivity.

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