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.

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.

Polyzwitterionic aqueous solutions – a new class of electrorheological fluids

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
George S. Georgiev ◽  
Anna A. Tzoneva ◽  
Velin A. Spassov
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Aqueous Solutions ◽  
Structural Organization ◽  
Cluster Formation ◽  
Electrorheological Fluids ◽  
Core Shell ◽  
New Class ◽  
Polyelectrolyte Solutions ◽  
Direction Opposite

AbstractIt has been established that the electroviscosity effect of polyzwitterionic (PZI) aqueous solutions is more considerable than and acts in a direction opposite to that of aqueous polyelectrolyte solutions. Temperature and electric field strength influence the electroviscosity of PZI aqueous solutions in parallel, though the reasons for these effects are quite different. The unusual electroviscosity behaviour of PZI solutions is explained by a ‘core-shell’ model for the structural organization of PZI macromolecules, suggesting that cluster formation is due to intensive dipoledipole interactions between monomer units of the same or of different macromolecules.

Dielectric behavior of alumina thin film under high DC electric field prepared by sol–gel method

2013 ◽  
Vol 03 (03) ◽  
pp. 1350017 ◽  
Author(s):  
Manwen Yao ◽  
Wei Shan
Keyword(s):  
Thin Film ◽  
Electric Field ◽  
Aluminum Oxide ◽  
Breakdown Strength ◽  
Amorphous State ◽  
Dielectric Behavior ◽  
Large Area ◽  
Sem Images ◽  
Dc Electric Field ◽  
Electrode Edge

Dielectric behavior of aluminum oxide (Al2O3) thin film under high DC electric field is presented and discussed. Aluminum oxide thin films were prepared starting from aluminum isopropoxide as a precursor via a wet chemistry route. Silicon substrates and silica glass substrates were used to deposit the films via spin-coating technique. The deposited films were then annealed under 450°C–700°C for 2–3 h. Dense, crack-free and uniform films were obtained. The thickness of the films is in the range of 200–800 nm. The films obtained are in amorphous state as revealed by the X-ray diffraction patterns. Voltage–Current (V–I) characteristics of the films were used to study the dielectric behavior of the films. Very low leakage current density J under high DC electric field E can be obtained. The breakdown electric field of the films is around 1.2 MV/cm. The V–I characteristics of the films are slightly nonlinear. With platinum as bottom electrode and gold as top electrode, successive breakdown phenomena of the films under high DC electric field were observed. Each breakdown event of the film corresponds to a sharp spike at the V–I plot of the sample. The shape of the breakdown spots of the films are in crater-like with a breakdown channel of diameter around a few micrometers as revealed by SEM images. The top gold electrode at the breakdown spots either splashed out or ripped off from the breakdown spots, which isolated the breakdown spots from rest of the electrode, and made the successive breakdown of the sample possible. The breakdown spots of the sample are concentrated at the edge of the electrode with proportional spacing, which can be easily understood as the edge effect of the parallel capacitor configuration, while the uniform distribution of the breakdown spots signifies that the uniformity of the films thus prepared are satisfied. Breakdown spots apart from the electrode edge can also be observed. Most of such spots associated with ripped-off gold film electrode in large area. We suppose such breakdown took place at higher electric field after the successive breakdown at the electrode edge and the isolation of the edge part from rest of the sample. Higher energy is needed to tear off larger section of the electrode. The breakdown characteristics of the films reported in this work are useful for the further study to enhance the breakdown strength of the film.

COMPARATIVE STUDY OF RESPONSE TO HIGH DC ELECTRIC FIELD IN A LARGE TEMPERATURE RANGE FOR K0.3MoO3

2004 ◽  
Vol 18 (14) ◽  
pp. 697-705
Author(s):  
HUI LI ◽  
JUNFENG WANG ◽  
RUI XIONG ◽  
FAN YI ◽  
WUFENG TANG ◽  
...  
Keyword(s):  
Electric Field ◽  
Linear Correlation ◽  
Applied Electric Field ◽  
Constant Current ◽  
Threshold Field ◽  
Large Temperature ◽  
Constant Voltage ◽  
Conducting State ◽  
Temperature Range ◽  
Dc Electric Field

We investigated the response of K 0.3 MoO 3 to high dc electric field in a large temperature range 14–95 K. The remarkable switching from insulating to highly conducting state was observed at 14–75 K. The second threshold field for the switching takes a minimum value at around 50 K. In the highly conducting state, the conductance displays a novel linear correlation to the applied electric field. We also compared the I–E characteristic obtained in the constant-voltage condition and the constant-current condition, which show distinct differential resistances.

scholarly journals Field-ionization processes in high Rydberg states of Rb under a rotating electric field

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
S. Yamada ◽  
H. Funahashi ◽  
M. Shibata ◽  
K. Kominato ◽  
Y. Kishimoto ◽  
...  
Keyword(s):  
Electric Field ◽  
Rydberg States ◽  
Field Ionization ◽  
Ionization Processes

Effect of Electric Field and Temperature in Electrochemical Dissolution and Deposition Process on Morphologies of ZnO Nanostructures

2015 ◽  
Vol 804 ◽  
pp. 30-33
Author(s):  
Buppachat Toboonsung
Keyword(s):  
Zinc Oxide ◽  
Electric Field ◽  
Room Temperature ◽  
Deposition Process ◽  
Deionized Water ◽  
Electrochemical Dissolution ◽  
Zno Nanostructures ◽  
Constant Voltage ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures

Zinc oxide nanostructures were synthesized by an electrochemical dissolution and deposition process. The zinc plates were immerged in deionized water and used as two electrodes. The process was operated by applying the electric field of 10, 12.5, 25 and 50 V/cm, the constant voltage of 10 V and varied the temperatures from room temperature to 70 °C during 1 h. It was found that the electric field and temperature of electrolyte solution had affected to morphologies of ZnO NSs and were grown in forms of nanoflakes, nanoparticles and nanorods.

NON-DESTRUCTIVE CONTROL OF CERAMICS BY THE RESULTS OF MEASURING ITS PERMITTIVITY IN THE MICROWAVE RANGE AND AT CONSTANT VOLTAGE

2021 ◽  
pp. 85-95
Author(s):  
N. S. Pshchelko ◽  
O. S. Tsareva
Keyword(s):  
Electric Field ◽  
Mechanical Strength ◽  
Constant Electric Field ◽  
Field Measurements ◽  
Microwave Range ◽  
Constant Voltage ◽  
Ceramic Samples ◽  
Non Destructive ◽  
Electric Field Measurements ◽  
Strength In Bending

The results of evaluating the mechanical strength characteristics of ceramic samples by a non-destructive method based on measuring their permittivity are considered. In this case, measurements of the permittivity were carried out both in the microwave range on an 8-mm interferometer and in a constant electric field. Measurements in a constant electric field demonstrated the best information content and correlation with the ultimate strength in bending of the studied samples.

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