Iron dissolution in aqueous AOT solution

Lehr, Ivana Leticia; Saidman, S.B.; Schulz, Pablo C.

doi:10.1016/j.jcis.2006.10.053

Cited by 6 publications

(7 citation statements)

References 17 publications

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“…Considering that the film with circular holes was not obtained employing iron or vitreous carbon as a substrate, the observed morphology does not seem to be the result of self‐assembled gas bubble template growth mechanism. As was stated before, PPy structures presented in Figure are very similar to those reported in a previous study, where the electrosynthesis of PPy was performed on iron in the presence of a lower AOT concentration . It was proposed that worm‐like fibrillar deposits grow until they bent forming near‐circular structures.…”

Section: Resultssupporting

confidence: 86%

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Synthesis of a hole‐containing polypyrrole film modified by copper cementation

Lehr

Saidman

2016

J of Applied Polymer Sci

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A simple procedure enables to obtain a hole-containing PPy film on SAE 4140 steel in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) solutions. The film characterization was made by electrochemical and morphological studies. The effects of electropolymerization parameters on the obtained morphology are discussed. The formation of the coating is conditioned by the nature of the substrate and surfactant and the electrochemical technique employed. Electrochemical investigations demonstrate that the hole-containing PPy film presents an increase in surface area. The polymer was modified by cementation of copper particles. The modified polymer offers a higher electrocatalytic activity for the HER than usual PPy.

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Section: Resultssupporting

confidence: 86%

“…The deposits grow during the second potential scan [Figure (B)]. These structures closely resemble those observed for PPy films electrosynthesized onto iron in 0.5 M Py with a low AOT concentration (0.005 M ) …”

Section: Resultssupporting

confidence: 63%

Synthesis of a hole‐containing polypyrrole film modified by copper cementation

Lehr

Saidman

2016

J of Applied Polymer Sci

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“…The fact that the solubility of iron iodate (6.2 × 10 −4 M) is at least 1 order of magnitude above that of the above-mentioned compounds could explain the slow formation of iron iodate product molecules. A second possibility would be the formation of an Fe(AOT) 3 , complex, because the absorbance of dilute Fe 3+ aqueous solutions (0.003 M) and Fe 3+ -based ME are slightly different, a plateau at about 335 nm being observed in the latter case (Figure a). Finally, the possibility that the presence of Na + ions in the water core of micelles could hinder the precipitation reaction ,, is also not excluded because the average occupancy factor of reactive ions per micelle should lead to an instantaneous reaction.…”

Section: Resultsmentioning

confidence: 99%

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

et al. 2010

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A detailed experimental investigation of the formation mechanisms of acentric iron iodate [Fe(IO 3 ) 3 ] nanocrystals in AOT-based reverse micelles according to the water-in-oil (w/o) microemulsion (ME) composition and temperature was performed. A low chemical reaction rate was first demonstrated by means of UV-vis absorption spectroscopy. Attainment of iron iodate crystalline nanorods was then attributed to an oriented aggregation mechanism of 10-20-nm amorphous primary nanoparticles. As for the intermicellar exchange of reactants, the aggregation mechanism was also found to be determined by the ME composition because clear effects of the surfactant and reactant concentrations, the nature of the oil phase, and the water droplet size were observed. Moreover, a combination of dynamic light scattering, X-ray diffraction, and transmission electron microscopy experiments revealed that hyper-Rayleigh scattering is a fast, valuable, and nondestructive alternative to probe, in real time, the crystallization and formation dynamics of acentric nanoparticles in microemulsions. This experimental approach can be extended to studies dealing with the formation of metal nanoparticles for which scattering of second-harmonic light is readily observed.

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“…13 Over recent years, Anionic sodium bis (2-ethylhexyl) sulfosuccinate (Aerosol OT, AOT) with its double-tail and polar headgroup has attracted increasing attention in aqueous, 14,15 nonaqueous 16−19 and water-in-oil (w/o) microemulsions. 20−26 During the last decades, different methods have been used to investigate the properties of AOT inverse micelles in nonpolar solvents.…”

Section: Introductionmentioning

confidence: 99%

“…Surfactants are widely used for charging colloidal particles in reflective displays, − inkjet printing, electrorheological fluids, emulsion polymerization, , and dry cleaning . Over recent years, Anionic sodium bis (2-ethylhexyl) sulfosuccinate (Aerosol OT, AOT) with its double-tail and polar headgroup has attracted increasing attention in aqueous, , nonaqueous − and water-in-oil (w/o) microemulsions. − …”

Section: Introductionmentioning

confidence: 99%

Charging Dynamics of Aerosol OT Inverse Micelles

et al. 2015

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Aerosol OT (AOT) is a commonly used surfactant and charging agent in nonpolar liquids. Properties such as the conductivity of AOT suspensions in nonpolar liquids and the behavior of charged AOT inverse micelles at interfaces have been studied recently, but still little is known about the generation dynamics of charged AOT inverse micelles. In this article, the generation dynamics of charged AOT inverse micelles in dodecane are investigated with transient current measurements. At low applied voltages, the generation rate is sufficiently fast to maintain the equilibrium concentration of charged inverse micelles, such that the current scales proportionally with the applied voltage. However, above a threshold voltage the current becomes limited by the generation of charged inverse micelles. Al 2 O 3-coated electrodes are used to achieve these high-voltage current measurements while reducing surface generation currents. The dependency of the resulting generation-limited currents with the micelle concentration and the liquid volume is compatible with a bulk disproportionation mechanism. The measured currents are analyzed using a model based on drift, generation, and recombination of charged inverse micelles and the corresponding generation and recombination rates of charged AOT inverse micelles have been determined. INTRODUCTIONSurfactants are widely used for charging colloidal particles in reflective displays, 1−8 inkjet printing, 9 electrorheological fluids, 10 emulsion polymerization, 11,12 and dry cleaning. 13Over recent years, Anionic sodium bis (2-ethylhexyl) sulfosuccinate (Aerosol OT, AOT) with its double-tail and polar headgroup has attracted increasing attention in aqueous, 14,15 nonaqueous 16−19 and water-in-oil (w/o) microemulsions. 20−26 During the last decades, different methods have been used to investigate the properties of AOT inverse micelles in nonpolar solvents. Peri has combined ultracentrifugation, light scattering, and viscometric measurements of AOT in various solvents, and he has suggested that AOT inverse micelles are monodisperse and spherical.27 Ekwall et al. have found similar results by using light and X-ray scattering. 28 Their studies indicate that the aggregation number N g , the number of monomers per inverse micelle, for AOT is about 20−30. Using a photon correlation experiment, Zulauf and Eicke 29,30,29,30 have studied the aggregation number of AOT micelles over a wide range of concentrations and in different solvents.27,28 Kotlarchyk et al. have used small-angle neutron scattering (SANS) and found an aggregation number of 22 ± 2 monomers per micelle. This difference can be explained by the hygroscopic properties of AOT, which makes the micelles absorb ambient moisture, and increases the conductivity of the AOT solution. 34 The charge-bearing entities are either trace ions such as formed from the dissociation of water into H + and OH − , or even charged AOT molecules that have released a H + . When two micelles collide there is a chance that these charged entities are e...

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Iron dissolution in aqueous AOT solution

Cited by 6 publications

References 17 publications

Synthesis of a hole‐containing polypyrrole film modified by copper cementation

Synthesis of a hole‐containing polypyrrole film modified by copper cementation

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

Charging Dynamics of Aerosol OT Inverse Micelles

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