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Pruneanu, Stela; Veress, Erzsébet; Marian, I.; Oniciu, L.

doi:10.1023/a:1004641908718

Cited by 129 publications

(56 citation statements)

References 9 publications

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“…[40][41][42] A potential value was thus applied for 20 min to the PAni deposits on the membrane, in order to promote a chemical form in the modication. The potential value selected was À100 mV, to promote the formation of the partially oxidized emeraldine structure.…”

Section: Characterization By Fourier Transform Infrared Spectroscopy mentioning

confidence: 99%

Influence of anion hydration status on selective properties of a commercial anion exchange membrane electrochemically impregnated with polyaniline deposits

et al. 2017

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There is currently great interest in the use of polyaniline (PAni) to impart particular properties to anion exchange membranes, employed in several fields. This special polymeric material can be obtained both chemically and electrochemically; however, the latter affords better control of morphology, which could be used to promote some properties of PAni-based membranes, such as their selectivity or hydrophobic/hydrophilic balance. In this work, commercially available membranes were electrochemically modified with PAni to improve their hydrophobic/hydrophilic balance, and this was achieved by cyclic voltammetry in acidic solutions. The performance of the modified membranes in the electrodialysis process of a nitrate-chloride mixture in neutral solutions was then evaluated. The impregnation imparts specific selective properties to the commercial membrane that lead to a greater retention of chloride ions. This property derives from the higher hydrophobicity of the PAni deposited on the membrane, which leads to a more effective exclusion of the more hydrated chloride anions.

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Section: Characterization By Fourier Transform Infrared Spectroscopy mentioning

confidence: 99%

Influence of anion hydration status on selective properties of a commercial anion exchange membrane electrochemically impregnated with polyaniline deposits

et al. 2017

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“…This radical cation then binds to the electrode surface by a head-tail coupling reaction with nitrinium formed from the 4-ATP present in the SAMs to produce the dimer aminodiphenylamine (ADPA) anchored to the surface. In the following anodic sweep, this dimeric unit is oxidized, generating a new reactive radical cation dimer [10,21]. These observations indicate that the polyaniline growth stage is initiated from the 4-ATP cation radical anchored onto the surface of the gold electrode, and this species seems to be acting as a nucleation site, and then polymerization proceeds from the bottom to the top of the hybrid template pore.…”

Section: Electropolymerization Of Aniline In the Aao And Aao/4-atp Hymentioning

confidence: 93%

“…As observed for the series of repetitive voltammograms, only after the second cycle are redox processes observed, with the peak currents continuously growing with the successive potential cycles. Peak I corresponds to the first oxidation of the neutral PANI film; process III corresponds to the fully oxidized form of PANI, the emeraldine/pernigraniline couple; and process II has been attributed to the presence of polymer structures with a high degree of network crosslinking, induced by a monomer attached at ortho-position of the aromatic ring on the main chain during the elongation stage [21]. The similarity of the these three voltammetric profiles regarding the redox processes observed during the electropolymerization process confirms the growth of the polyaniline in the three systems represented in Fig.…”

Section: Electropolymerization Of Aniline In the Aao And Aao/4-atp Hymentioning

confidence: 99%

“…The voltammogram in black (AAO template) does not show any visible oxidation process below 0.9 V, and beyond this value, an irreversible intense redox process appears which is assigned to the formation of the radical-cation anilinium (C 6 H 5 NH *+ ) which can be formed from the oxidation of the aniline monomers at the vicinity of the electrode surface. This anilinium radical is stabilized by resonance [22] and a rapid coupling process of radicals takes place which leads to the formation of the dimer p-aminodiphenylamine (ADPA), and thereafter, the polymer growth process continues to progress [21][22][23]. In contrast, the profile of the first electropolymerizing cycle of aniline in the hybrid template shows a very different shape.…”

Section: Electropolymerization Of Aniline In the Aao And Aao/4-atp Hymentioning

confidence: 99%

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Polyaniline nanostructure electrode: morphological control by a hybrid template

Silva

Santander-Nelli

Vera-Oyarce

et al. 2015

J Solid State Electrochem

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We report here a novel approach to the templateassisted electrochemical synthesis of vertically aligned polyaniline (PANI) nanostructure surface arrays. When PANI is obtained by electropolymerization inside a custommade anodic aluminum oxide (AAO) template, with an Au layer sputtered onto one side of the AAO acting as an anode, PANI nanotubes are obtained. In contrast, when the surface of this gold layer is modified with 4-aminothiophenol (4-ATP) as a self-assembled monolayer (SAM) film anchored to the gold layer via the thiol groups and on the opposite end having NH 2 functionalities, we obtain a surface array of PANI nanowires. Cyclic voltammetry and SEM analysis show that the amino functionalities of Au/SAMs act as a nucleation site in the internal base of the AAO pore and determine both the morphology and structure of polyaniline and its electronic properties as well.

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“…12 Cathodic reactions exhibited reversible redox processes. The two middle peaks are assigned to the redox reactions of oligomers and the degradation of the PANI.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Characterization and Analysis of the Electrochemical Properties of the Polyaniline Synthesized by Emulsion Polymerization in Constant Magnetic Field (0.4 T)

Luo

et al. 2010

Chin. J. Chem.

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A new, convenient and economical method was established firstly, which took loaded polyaniline (PANI) carbon paper as the working electrode to real-time characterize and analyze the electrochemical properties of the PANI synthesized by emulsion polymerization in constant magnetic field (MF, 0.4 T). The characterization results of the electrochemical properties of the PANI had been proved by contrast analysis of the thermal stability of conductivity, FT-IR, XRD and TGA of the PANI. The experimental results of cyclic voltammogram, AC impedance, Tafel curve and electrochemical stability showed that the PANI synthesized in the presence of the MF had larger redox current, smaller charge resistance, higher corrosion potential and better electrochemical stability. The PANI thermal stability of conductivity had been measured in the temperature range from 20 to 140 , and the results showed that the ℃ PANI synthesized in the presence of the MF had better thermal stability of conductivity. The results of FT-IR, XRD and TGA indicated that the characteristic peaks of FT-IR spectra of the PANI synthesized in the presence of the MF shifted to the lower wavenumbers, and its crystallinity and thermal stability were also improved.

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Cited by 129 publications

References 9 publications

Influence of anion hydration status on selective properties of a commercial anion exchange membrane electrochemically impregnated with polyaniline deposits

Influence of anion hydration status on selective properties of a commercial anion exchange membrane electrochemically impregnated with polyaniline deposits

Polyaniline nanostructure electrode: morphological control by a hybrid template

Characterization and Analysis of the Electrochemical Properties of the Polyaniline Synthesized by Emulsion Polymerization in Constant Magnetic Field (0.4 T)

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