Transformation of the Nanoporous Structure of Anodic Aluminium Oxide and its “Nonelectrolysis” Electroluminescence

2020 ◽  
Vol 312 ◽  
pp. 166-171
Author(s):  
Dmitry Ovechenko ◽  
Alexander Boychenko
Keyword(s):  
Structural Organization ◽  
Pure Aluminum ◽  
Nanoporous Structure ◽  
Geometrical Parameters ◽  
Carbonyl Groups ◽  
Lower Intensity ◽  
External Voltage ◽  
Electrolytic Oxidation ◽  
Related Compounds ◽  
Electrolysis Products

On a film of aluminum oxide (Al2O3) formed by electrolytic oxidation in distilled water (DW), the growth, transformation of its nanoporous structure, and the generation of electroluminescence (EL) in ketones and related compounds containing carbonyl groups were studied. For those contributing to the brightest EL – acetylacetone and methylpyrrolidone, it was found that the processes described in these electrolytes proceed with the highest intensity. Under the same electrolytes and conditions, similar processes, but with a lower intensity, proceed for A2O3 formed on pure aluminum. It was found that, with the external voltage, thermodynamic and geometrical parameters of the electrolytic system being constant, the brightness characteristics of the EL of the anodic Al2O3 are influenced by its structural organization and the electrophysical characteristics of the electrolyte surrounding the oxide film, which is proposed to be arbitrarily called “nonelectrolysis” because electrolysis products are not revealed in it.

scholarly journals Особенности электролюминесценции алюминия и его нанопористого оксида в сложных эфирах и кетонах

2021 ◽  
Vol 129 (7) ◽  
pp. 938
Author(s):  
Д.С. Oвеченко ◽  
А.П. Бойченко ◽  
Н.А. Яковенко
Keyword(s):  
Dibutyl Phthalate ◽  
Pure Aluminum ◽  
Diethyl Malonate ◽  
Dicarboxylic Acids ◽  
Nanoporous Structure ◽  
Diethyl Oxalate ◽  
Initial Structure ◽  
Carbonyl Groups ◽  
Ir And Nmr Spectroscopy ◽  
Related Compounds

On the example of esters of carboxylic and dicarboxylic acids (ethyl acetate, diethyl oxalate, diethyl malonate, diethyl phthalate and dibutyl phthalate), as well as ketones, lactams and diketones (acetone, cyclohexanone, 4-ethylpropiophenone, acetylacetone and methylpyrrolidone) studies were carried out to generate electroluminescence (EL) in them of pure aluminum (Al) and preoxidized (Al2O3) in distilled water. The absence of EL in pure Al in ethers was revealed, and the regularities of luminescence generation in them for the oxidized metal were established. It was shown that in ketones and related compounds - lactams and diketones, the appearance of EL is possible for both states of the Al anode. In this case, the EL spectra have broad bands in the range 400 - 700 nm with maxima characteristic of the carboxyl and carbonyl groups of the electrolytes used, as well as the nanoporous structure of the formed Al2O3 and carbon-containing impurities captured by it during the growth. In some ethers and ketones, the effect of transformation of the initial structure of the oxide, as well as an increase in its thickness, was found. The absence of any changes in the chemical composition of electrolytes after anodic oxidation of Al in them or transformation of Al2O3 was established by UV, IR and NMR spectroscopy.

scholarly journals Электролюминесценция анодного оксида алюминия в кетонах

2020 ◽  
Vol 128 (2) ◽  
pp. 256
Author(s):  
Д.С. Овеченко ◽  
А.П. Бойченко
Keyword(s):  
Electric Field ◽  
Aluminum Oxide ◽  
Elemental Composition ◽  
Structural Organization ◽  
Distilled Water ◽  
Carbonyl Groups ◽  
Constant Voltage ◽  
Kinetic Characteristics ◽  
Ionization Processes ◽  
Related Compounds

The film of aluminum oxide formed by electrolysis in distilled water demonstrated the possibility of generating its electroluminescence in ketones and related compounds containing carbonyl groups. For acetone, cyclohexanone, methylpyrrolidone, acetylacetone, 4-ethylpropiophenone and 4-methoxypropiophenone, it was established that this process proceeds without electrolysis of the above compounds. It was shown that at constant voltage and temperature, the brightness-kinetic characteristics of luminescence are significantly affected by a combination of the following factors: the structure and elemental composition of hydrocarbon radicals of ketones, the number of carbonyl groups at these radicals, the thickness and structural organization of Al2O3 oxide films, on the surface of which local amplification is possible electric field strengths up to values of the order of 10^6 V/m, sufficient to initiate and maintain ionization processes leading to generation light.

Carbon Disulfide. III. Reaction with Active Methylene Compounds. The Infrared and Ultraviolet Spectra of the Desaurins

1971 ◽  
Vol 49 (9) ◽  
pp. 1467-1476 ◽  
Author(s):  
Peter Yates ◽  
Thomas R. Lynch ◽  
Donald R. Moore
Keyword(s):  
Carbon Disulfide ◽  
Strong Interaction ◽  
Fermi Resonance ◽  
Carbonyl Groups ◽  
Ultraviolet Spectra ◽  
Weak Intensity ◽  
Active Methylene Compounds ◽  
Active Methylene ◽  
Related Compounds

The position of the carbonyl-stretching bands in the i.r. spectra of the desaurins, 2,4-bis(acylmethylene)- and 2,4-bis(carboxymethylene)-1,3-dithetane derivatives, establishes that there is a strong interaction between the sulfur atoms and the carbonyl groups. This is considered to involve mainly conjugative interaction rather than interaction through space, although the latter may account for the abnormally weak intensity of the carbonyl-stretching bands. These bands are split in the case of several desaurins and related compounds, and evidence has been obtained in one case that the splitting is due to Fermi resonance. The u.v. spectra of the desaurins and related compounds also indicate a strong conjugative interaction between the sulfur atoms and the carbonyl groups.

Sign in / Sign up

Export Citation Format

Share Document