Mechanism of Anodic Growth of Tubular Titania

Lazarouk, S. K.; Купреева, О. В.; Tsirkunov, D. A.; Sasinovich, D. A.; Dudich, V. V.; Rabatuev, G. G.

doi:10.1134/s1063784220050138

Cited by 2 publications

(1 citation statement)

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“…[1][2][3][4][5] An appropriate choice of the electrolyte and electric regime of anodization, which is the anodic voltage and anodic current density, provides fabrication of porous structures changing from self-organized hexagonal honeycomb-like cells to nanotubes. [6,7] The highest possible anodic voltages and current densities were found to be desired for their best ordering. [6] These electric parameters are limited by heating of the thin barrier layers of alumina at the bottom of the pores contacting with aluminum where new portions of alumina are formed.…”

Section: Introductionmentioning

confidence: 99%

Formation of Alumina Nanotubes and Jet Effect during High‐Voltage Local Anodization of Aluminum

et al. 2021

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Using an improved heat sink from the barrier layer, the voltage of anodic electrochemical oxidation of aluminum in sulfuric electrolytes is successfully increased from the conventional limit of about 40 to 200 V. This is done by localization of the anodized regions within the windows in the niobium thin film masks with the diameters of 0.3 μm to 2.5 mm. High‐voltage anodization in water solutions of sulfuric acid is observed to be accompanied by a reproducible formation of densely packed alumina nanotubes and intense gas propulsion from the pores of the forming alumina. The latter is proposed and experimentally confirmed for use as an efficient driving agent in micro‐ and nanoengines. Test samples are accelerated to the velocities up to 1 cm s−1, demonstrating a thrust‐to‐weight ratio of about 1000.

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