scholarly journals Fabrication and characterization of highly ordered nanotubes of anodic aluminum oxide

2021 ◽  
pp. 9-13
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Nanometer Scale ◽  
Force Microscopy ◽  
Anodic Aluminum ◽  
Interpore Distance ◽  
Adhesion Sites ◽  
Atomic Force

Investigated the electrochemical synthesis and characterized of a nanometer scale porous anodic aluminum oxide (AAO) membrane with a mean pore diameter about of 80-100 nm. The anodizing process done by varying the anodizing temperature from 20 °C to 25 °C. The membranes exhibit interesting properties such as controllable pore diameters, periodicity and density distribution. These properties can preselect by adjusting the controlling parameters of a temperature-controlled two-step anodization process. The surface features of the nanometer scale membrane such as pore density, pore diameter and interpore distance were quantified using scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM investigations revealed the presence of focal adhesion sites over the surface of the porous membranes. The positive outcomes of the study, indicates that AAO membranes can used for applications in the future.

scholarly journals Fabrication and geometric characterization of highly-ordered hexagonally arranged arrays of nanoporous anodic alumina

2014 ◽  
Vol 16 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Wojciech J. Stępniowski ◽  
Agata Nowak-Stępniowska ◽  
Marta Michalska-Domańska ◽  
Małgorzata Norek ◽  
Tomasz Czujko ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Theoretical Calculations ◽  
Anodization Voltage ◽  
Voltage Range ◽  
Nanoporous Anodic Alumina ◽  
Anodic Aluminum ◽  
Interpore Distance

Abstract Anodic aluminum oxide (AAO) has been fabricated in the 0.3 M oxalic acid at voltage range 20-60 V and temperature range of 35-50oC. The resulting nanoporous alumina surfaces were characterized by high resolution scanning electron microscopy, and the images were quantitatively analysed by means of an innovative approach based on fast Fourier transform. The influence of operating anodization voltage and electrolyte temperature on nanopores geometry (pore diameter, interpore distance, porosity, pores density) and arrangement has been studied in details and compared to literature data and theoretical calculations. It was found that independently from the temperature, the best arrangement of the nanopores is for anodic aluminum oxide formed at voltages ranging from 40 to 50 V. Moreover, it was found that pore diameter and interpore distance increase linearly with voltage, what is in line with the literature data.

Fabrication of Low Cost Membrane from Anodic Aluminum Oxide

2017 ◽  
Vol 751 ◽  
pp. 363-367
Author(s):  
Peerawith Sumtong ◽  
Apiluck Eiad-Ua
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Process Conditions ◽  
Low Grade ◽  
Pore Density ◽  
Average Pore ◽  
Anodic Aluminum ◽  
Interpore Distance

Anodic Aluminum Oxide (AAO) membrane has been successfully fabricated from two-step anodization with aluminum low grade (Al6061). The pore density, the pore diameter, and the interpore distance can be controlled by varying anodization process conditions. However, there are limits to control the mechanical strength and growth of AAO arrays, such as pore density, pore diameter and interpore distance. In this research the self-organized two-step anodization is carried out varying time at 24, 48 and 72 hours, respectively with 40V at the low temperature 2-5°C. The optimum conditions of AAO with two-step anodization is 40V for 48 hr. Finally, AAO substrate is separated from aluminum low-grade and enlarged pore diameter with pore widening process by 5% H3PO4. The physical properties were investigated by mean of field emission scanning electron microscope (FE-SEM) show that the average pore diameter and average interpore distance increase with the anodization time. Al6061 Aluminum substrate can be used to fabricate a nanoporous AAO film with an average pore diameter and average interpore distance larger than 70 and 90 nanometers, respectively but less mechanical stability.

Preparation and characterization of polyamide 66 nanotubes and nanowires on an anodic aluminum oxide template by a physical wetting method

2006 ◽  
Vol 21 (5) ◽  
pp. 1209-1214 ◽  
Author(s):  
Xilin She ◽  
Guojun Song ◽  
Jianjiang Li ◽  
Ping Han ◽  
Shujing Yang ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Polymer Melt ◽  
Anodic Aluminum Oxide Template ◽  
Polyamide 66 ◽  
Anodic Aluminum ◽  
Array Structure ◽  
Wetting Method

Polyamide 66 (PA66) nanotubes with an array structure were prepared by infiltrating a solution of normal molecular weight PA66 into anodic aluminum oxide (AAO) templates with a pore diameter of 200 nm. The results of field-emission scanning electron microscopy (FESEM) demonstrate that PA66 nanotubes with a wall thickness of about 60 nm can be fabricated by a solution-wetting method and PA66 nanotubes and nanowires can be obtained by a melt-wetting method at different temperature. We also find that PA66 nanotubes have the “super plasticity” for the crystalline belts in their wall may arrange by spiraling and rounding style. Thermogravimetric analysis (TGA) indicates the nanotubes have a better thermal stability than bulk polymer PA66. The mechanism of forming polymer nanotubes by polymer melt-wetting method has been proposed.

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 and Morphology Characterization of Self-Ordering Anodic Aluminum Oxide Films Using Multi-Step Anodizing

2014 ◽  
Vol 59 (1) ◽  
pp. 345-350
Author(s):  
D. Ma ◽  
S.-b. Li ◽  
X.-y. Dong ◽  
X.-y. Hu ◽  
B. Wang ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Oxide Films ◽  
Anodic Aluminum ◽  
Morphology Characterization

Fabrication and optical characterization of silver-coated gradient-grown anodic aluminum oxide

2020 ◽  
Vol 2 (3) ◽  
pp. 035004
Author(s):  
Hee Jae Hwang ◽  
Yeonseok Jeong ◽  
Songhwa Chae ◽  
Dukhyun Choi
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Optical Characterization ◽  
Anodic Aluminum
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