scholarly journals Gas separation processes in a diffusion module based on anodic aluminum oxide membrane elements

2021 ◽  
Vol 65 (6) ◽  
pp. 749-754
Author(s):  
O. L. Voitik ◽  
K. I. Delendik ◽  
N. V. Kolyago
Keyword(s):  
Aluminum Oxide ◽  
Gas Separation ◽  
Anodic Aluminum Oxide ◽  
Structural Characteristics ◽  
Knudsen Diffusion ◽  
Operating Conditions ◽  
Membrane Module ◽  
Separation Processes ◽  
Anodic Aluminum ◽  
Methane Mixture

Anodic alumina membranes with an ordered microstructure have been synthesized and investigated. It was found that Knudsen diffusion is the predominant mechanism for gas penetration through the obtained membranes. The technology made it possible to obtain porous membranes with specified structural characteristics for the separation of gas mixtures. Designs of a diffusion element and a gas separation module based on membranes made of anodic aluminum oxide have been developed, and the features of mass transfer under various operating conditions have been studied. The membrane module without recirculation made it possible to concentrate the heavy component from the model helium-methane mixture (99 % / 1 %) up to 18 %. The membrane module with recirculation made it possible to concentrate a light component from a model helium-methane mixture (1 % / 99 %) up to 40 %.

scholarly journals Influence of the anodization conditions and chemical treatment on the formation of alumina membranes with defined pore diameters

2021 ◽  
Author(s):  
Iwona Dobosz
Keyword(s):  
Aluminum Oxide ◽  
Chemical Treatment ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Operating Conditions ◽  
Oxide Growth ◽  
Pore Density ◽  
Anodic Aluminum ◽  
Pore Widening ◽  
Oxide Membranes

AbstractPorous anodic aluminum oxide membranes were fabricated via two-step anodization of aluminum in 0.3 M H2C2O4, 0.3 M H2SO4 and 0.17 M H3PO4 solutions. The parameters of the oxide film such as: pore diameter (Dp), interpore distance (Dc), porosity (P) and pore density (ρ) can be completely controlled by the operating conditions of the anodization. Additionally, the pore diameters and pore density can be controlled via a chemical treatment (pore opening/widening process). The effect of anodizing conditions such as the applied voltage, type of electrolyte and purity of the substrate on the rate of porous oxide growth are discussed. The obtained results were compared with the theoretical predictions and data that has been reported in the literature. The influence of the duration of chemical etching on the structural features of the oxide membranes was studied. On the based on qualitative and quantitative FFT analyzes and circularity maps, it was found that the nanostructures of anodized aluminum have the maximum order under certain specified conditions. The presence of alloying elements affects not only the rate of oxide growth but also the morphology of the anodic aluminum oxide. The rate of oxide growth depends on the electrolyte type and temperature. During chemical treatment of the oxide films pore diameter increases with the pore widening time and the highest pore widening was observed in phosphoric acid solution.

Fabrication of Anodic Aluminum Oxide Film on Large-Area Glass Substrate

2007 ◽  
Vol 10 (12) ◽  
pp. C69 ◽  
Author(s):  
Ching-Jung Yang ◽  
Shih-Wei Liang ◽  
Pu-Wei Wu ◽  
Chih Chen ◽  
Jia-Min Shieh
Keyword(s):  
Oxide Film ◽  
Aluminum Oxide ◽  
Glass Substrate ◽  
Anodic Aluminum Oxide ◽  
Large Area ◽  
Anodic Aluminum Oxide Film ◽  
Aluminum Oxide Film ◽  
Anodic Aluminum

scholarly journals Formation of MoS2 nanostructure arrays using anodic aluminum oxide template

2020 ◽  
Vol 9 ◽  
pp. 100071
Author(s):  
Takaki Okamoto ◽  
Tomohiro Shimizu ◽  
Koichi Takase ◽  
Takeshi Ito ◽  
Shoso Shingubara
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Anodic Aluminum Oxide Template ◽  
Anodic Aluminum ◽  
Nanostructure Arrays

Synthesis and properties of iridescent Zn-containing anodic aluminum oxide films

2015 ◽  
Vol 586 ◽  
pp. 8-12 ◽  
Author(s):  
Xiaoxuan Jia ◽  
Huiyuan Sun ◽  
Lihu Liu ◽  
Xue Hou ◽  
Huiyuan Liu
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Oxide Films ◽  
Anodic Aluminum
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