Porous Layer Characterization of Anodized and Black-Anodized Aluminium by Electrochemical Studies

Three types of black anodic coatings, namely, black dyeing (BD), inorganic colouring (IC), and electrolytic colouring (EC) were prepared by conventional type II sulphuric acid anodizing on Al6061 alloys. Electrochemical behaviour of these coatings was studied by exposure to 3.5% wt sodium chloride solution for prolonged immersion periods up to 360 hours. The porous layer characteristics of all sealed, fresh and autosealed coatings were investigated by means of electrochemical impedance spectroscopy (EIS). An equivalent circuit that reproduces the a.c. impedance results of porous aluminium oxide films is proposed. The breakpoint frequency and damage function analysis were carried out to analyse the coating's electrochemical behaviour. Corrosion morphology was studied by scanning electron microscopy. It was observed that BD and IC behaved in a very similar manner to sulphuric acid anodising (SAA). However EC was behaving in an entirely different manner. Among all colouring methods BD was showing very less values. All these findings were further confirmed by linear polarisation studies. No major evidence of localised corrosion or pitting of the black anodic coatings was observed in SEM micrographs.

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Mechanical and Electrochemical Characterization of Super-Solidus Sintered Austenitic Stainless Steel (316L)

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0083 ◽

2016 ◽

Vol 35 (7) ◽

pp. 643-651 ◽

Cited By ~ 1

Author(s):

A. Muthuchamy ◽

A. Raja Annamalai ◽

Rishabh Ranka

Keyword(s):

Stainless Steel ◽

316L Stainless Steel ◽

Electrochemical Impedance ◽

Electrochemical Behaviour ◽

Compaction Pressure ◽

Solidus Temperature ◽

Stainless Steel 316L ◽

Aisi 316L Stainless Steel ◽

Strength And Ductility

AbstractThe present study compares the mechanical and electrochemical behaviour of austenitic (AISI 316L) stainless steel compacted at various pressures (200, 400 and 600 MPa) and conventionally sintered at super-solidus temperature of 1,400°C. The electrochemical behaviour was investigated in 0.1 N H2SO4 solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The shrinkage decreased and densification has been increased with increasing pressure. The mechanical and electrochemical behaviour with pressure has been correlated with densification response and microstructure (pore type, volume and morphology). Highest densification (~92% theoretical) achieved at 600 MPa (compaction pressure) and 1,400°C (sintering temperature) resulted in excellent combination of tensile strength and ductility (456 ± 40 MPa, 25 ± 1.1%), while showing excellent corrosion resistance (0.1 mmpy or 4.7 mpy).

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Electrochemical Characteristics of Azo Dyes Doped Poly(3,4-Ethylenedioxythiophene)

Biointerface Research in Applied Chemistry ◽

10.33263/briac106.69126925 ◽

2020 ◽

Vol 10 (6) ◽

pp. 6912-6925

Keyword(s):

Azo Dyes ◽

Electrochemical Impedance ◽

Electrochemical Behaviour ◽

Glass Electrode ◽

Electrochemical Characteristics ◽

Pedot Film ◽

Ito Glass ◽

Electrochemically Deposited ◽

Dyes Adsorption

In the present study, the electrosynthesis and the electrochemical characterization of azo dyes doped poly(3,4-ethylenedioxythiophene (PEDOT) were described. PEDOT film was electrochemically deposited onto indium doped tin oxide (ITO) coated/glass electrode, following azo dyes adsorption. The electropolymerized-PEDOT films on ITO glass were doped with various azo dyes; 4-Phenylazo-2-phenyliminomethyl-phenol (PAPM), 4-Phenylazo-2-(p-tolyimino-methyl)-phenol (PATM) and 4-[(2-Hydroxy-5-phenylazo-benzylidene)-amino]-benzenesulfonic acid (HPAB). The structures of azo dyes-doped PEDOT were characterized via cycle voltammograms and electrochemical impedance spectroscopy (EIS). Diverse doping counterions have a significant influence on the electrochemical behaviour of electropolymerized-PEDOT film. The electropolymerized-PEDOT doped by HPAB (PEDOT-HPAB) film possesses higher electrochemical activity than other azo dye-doped PEDOT composites. The main characteristics of PEDOT-azo dyes films contain uniformity, durability, and adherent on ITO electrodes, which are better when it is compared to PEDOT film.

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Electrochemical behaviour of oxocarbons on single crystal platinum electrodes Part V. Tetrahydroxy-p-benzoquinone in 0.5 M sulphuric acid medium

Journal of Electroanalytical Chemistry ◽

10.1016/s0022-0728(97)00084-3 ◽

1997 ◽

Vol 440 (1-2) ◽

pp. 57-64 ◽

Cited By ~ 2

Author(s):

R Carbó

Keyword(s):

Single Crystal ◽

Acid Medium ◽

Sulphuric Acid ◽

Electrochemical Behaviour ◽

Platinum Electrodes ◽

Sulphuric Acid Medium

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Characterization of diacylglycerol acyltransferase 2 from Idesia polycarpa and function analysis

Chemistry and Physics of Lipids ◽

10.1016/j.chemphyslip.2020.105023 ◽

2021 ◽

Vol 234 ◽

pp. 105023

Author(s):

Ruishen Fan ◽

Gui Cai ◽

Xuanyuan Zhou ◽

Yuxin Qiao ◽

Jiabao Wang ◽

...

Keyword(s):

Function Analysis ◽

Diacylglycerol Acyltransferase ◽

And Function

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Electrochemical Investigation of Curcumin–DNA Interaction by Using Hydroxyapatite Nanoparticles–Ionic Liquids Based Composite Electrodes

Materials ◽

10.3390/ma14154344 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4344

Author(s):

Merve Uca ◽

Ece Eksin ◽

Yasemin Erac ◽

Arzum Erdem

Keyword(s):

Electrochemical Impedance ◽

Differential Pulse ◽

Dna Interaction ◽

Composite Electrodes ◽

Hydroxyapatite Nanoparticles ◽

Graphite Electrodes ◽

X Ray ◽

Pulse Voltammetry ◽

Polymerase Chain

Hydroxyapatite nanoparticles (HaP) and ionic liquid (IL) modified pencil graphite electrodes (PGEs) are newly developed in this assay. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and cyclic voltammetry (CV) were applied to examine the microscopic and electrochemical characterization of HaP and IL-modified biosensors. The interaction of curcumin with nucleic acids and polymerase chain reaction (PCR) samples was investigated by measuring the changes at the oxidation signals of both curcumin and guanine by differential pulse voltammetry (DPV) technique. The optimization of curcumin concentration, DNA concentration, and the interaction time was performed. The interaction of curcumin with PCR samples was also investigated by gel electrophoresis.

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The Characterization of Nanocrystalline Dye-Sensitized Solar Cells with Flexible Metal Substrates by Electrochemical Impedance Spectroscopy

Journal of The Electrochemical Society ◽

10.1149/1.2374943 ◽

2007 ◽

Vol 154 (1) ◽

pp. B68 ◽

Cited By ~ 40

Author(s):

Yongseok Jun ◽

Man Gu Kang

Keyword(s):

Solar Cells ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Dye Sensitized Solar Cells ◽

Metal Substrates ◽

Dye Sensitized ◽

Flexible Metal ◽

Sensitized Solar Cells

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Correction to: Electrochemical Impedance Spectroscopy Characterization of Silicon-Based Electrodes for Li-Ion Batteries

Electrocatalysis ◽

10.1007/s12678-020-00597-9 ◽

2020 ◽

Vol 11 (3) ◽

pp. 364-364

Author(s):

Maciej Ratynski ◽

Bartosz Hamankiewicz ◽

Michał Krajewski ◽

Maciej Boczar ◽

Dominika A. Buchberger ◽

...

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Li Ion Batteries ◽

Li Ion ◽

Silicon Based

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Synthesis and Characterization of Partially Renewable Oleic Acid-Based Ionomers for Proton Exchange Membranes

Polymers ◽

10.3390/polym13010130 ◽

2020 ◽

Vol 13 (1) ◽

pp. 130

Author(s):

Carlos Corona-García ◽

Alejandro Onchi ◽

Arlette A. Santiago ◽

Araceli Martínez ◽

Daniella Esperanza Pacheco-Catalán ◽

...

Keyword(s):

Oleic Acid ◽

Proton Conductivity ◽

Electrochemical Impedance ◽

Proton Exchange Membranes ◽

Proton Exchange ◽

Molar Ratio ◽

Aromatic Diamines ◽

Chemical Structures ◽

Long Chain

The future availability of synthetic polymers is compromised due to the continuous depletion of fossil reserves; thus, the quest for sustainable and eco-friendly specialty polymers is of the utmost importance to ensure our lifestyle. In this regard, this study reports on the use of oleic acid as a renewable source to develop new ionomers intended for proton exchange membranes. Firstly, the cross-metathesis of oleic acid was conducted to yield a renewable and unsaturated long-chain aliphatic dicarboxylic acid, which was further subjected to polycondensation reactions with two aromatic diamines, 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline and 4,4′-diamino-2,2′-stilbenedisulfonic acid, as comonomers for the synthesis of a series of partially renewable aromatic-aliphatic polyamides with an increasing degree of sulfonation (DS). The polymer chemical structures were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H, 13C, and 19F NMR) spectroscopy, which revealed that the DS was effectively tailored by adjusting the feed molar ratio of the diamines. Next, we performed a study involving the ion exchange capacity, the water uptake, and the proton conductivity in membranes prepared from these partially renewable long-chain polyamides, along with a thorough characterization of the thermomechanical and physical properties. The highest value of the proton conductivity determined by electrochemical impedance spectroscopy (EIS) was found to be 1.55 mS cm−1 at 30 °C after activation of the polymer membrane.

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