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Your search keyword '"Małgorzata Norek"' showing total 3 results
Start Over Author "Małgorzata Norek" Journal electrochimica acta
3 results on '"Małgorzata Norek"'

1. The influence of electrolyte composition on the growth of nanoporous anodic alumina

Author

Marta Michalska-Domańska, Marco Salerno, Alice Scarpellini, Marcin Moneta, Wojciech J. Stępniowski, and Małgorzata Norek

Subjects
Aqueous solution, Materials science, Nanoporous, Anodizing, General Chemical Engineering, Inorganic chemistry, Oxide, 02 engineering and technology, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Mole fraction, 01 natural sciences, 0104 chemical sciences, Barrier layer, chemistry.chemical_compound, chemistry, Electrochemistry, Chromic acid, 0210 nano-technology
Abstract

Aluminum was anodized in mixtures of aqueous sulfuric and chromic acid in different ratios, with overall concentration of 1.0 M. It was found that the logarithm of current density (and consequently, oxide growth rate) is a square function of the anodizing voltage. Moreover, the barrier layer thickness at the pores bottom was found to increase exponentially with the voltage, and increased as well with the fraction of chromic acid in the electrolyte. Additionally, interpore distance of anodic aluminum oxide, formed at the same voltage, was found to increase exponentially with the molar fraction of the chromic acid. Altogether, the high impact of the composition of the electrolyte on the morphological features of the nanoporous arrays is revealed.

Published
2016

2. The impact of viscosity of the electrolyte on the formation of nanoporous anodic aluminum oxide

Author

Wojciech J. Stępniowski, Małgorzata Norek, Artur Król, Dominika Forbot, and Marta Michalska-Domańska

Subjects
Materials science, Anodizing, Nanoporous, General Chemical Engineering, Inorganic chemistry, Oxide, Electrolyte, Electrochemistry, chemistry.chemical_compound, Viscosity, chemistry, Chemical engineering, Porosity, Current density
Abstract

Anodic aluminum oxide was formed in 0,3 M oxalic acid at various content of glycerol (from 0 to 100 vol. %), at voltage range from 20 to 60 V (30 °C, 1 h long steps). Due to the influence of viscosity on the ionic mobility, current density, as well as on the thickness of the grown oxide, current density and thickness of the grown oxide were found to be linear functions of the inversed viscosity. Quantitative FE-SEM images analyses revealed surprising relation: interpore distance increases with the viscosity (logarithmic function). Additionally, pore diameter, porosity and pores density were also influenced by viscosity of the electrolyte. We have found that viscosity of the electrolyte, one of the most important factors in electrochemistry, has significant influence on the anodic alumina formation.

Published
2014

3. Fabrication of high quality anodic aluminum oxide (AAO) on low purity aluminum—A comparative study with the AAO produced on high purity aluminum

Author

Marta Michalska-Domańska, Wojciech J. Stępniowski, Bogusław Budner, and Małgorzata Norek

Subjects
Materials science, Fabrication, Anodic Aluminum Oxide, Nanoporous, Anodizing, General Chemical Engineering, Metallurgy, chemistry.chemical_element, Sulfuric acid, Electrochemistry, chemistry.chemical_compound, chemistry, Chemical engineering, Aluminium
Abstract

In this work the quality, arrangement, composition, and regularity of nanoporous AAO formed on the low-purity (AA1050) and high-purity aluminum during two-step anodization in a mixture of sulfuric acid solution (0.3 M), water and glycol (3:2, v/v), at various voltages (15, 20, 25, 30, 35 V) and at temperature of −1 °C, are investigated. The electrochemical conditions have allowed to obtain pores with the size ranging from 30 to 50 nm, which are much larger than those usually obtained by anodization in a pure sulfuric acid solution (

Published
2013

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