Definition of AAO (Anodized Aluminium Oxide)
Anodizing is a type of metal surface treatment technology.
Metal surface treatment refers to a technology that physically and chemically corrodes metals and non-metals or changes surface properties to improve the appearance, durability, and functionality of materials and parts without changing the characteristics of the raw materials.
Anodizing refers to the process of electrochemically oxidizing a metal surface to form a nanoporous film with many holes, and using aluminum as the anode in an electrolyte and passing electricity through it is called aluminum anodization.
In the process of aluminum anodization, the aluminum surface is oxidized by oxygen generated at the anode to form an aluminum oxide film, which is called 'anodized aluminum AAO (Anodized Aluminium Oxide)'.
Large-Area AAO
Anodizing Technology
Definition of AAO (Anodized Aluminium Oxide)
Anodizing is a type of metal surface treatment technology.
Metal surface treatment refers to a technology that physically and chemically corrodes metals and non-metals or changes surface properties to improve the appearance, durability, and functionality of materials and parts without changing the characteristics of the raw materials.
Anodizing refers to the process of electrochemically oxidizing a metal surface to form a nanoporous film with many holes, and using aluminum as the anode in an electrolyte and passing electricity through it is called aluminum anodization.
In the process of aluminum anodization, the aluminum surface is oxidized by oxygen generated at the anode to form an aluminum oxide film, which is called 'anodized aluminum AAO (Anodized Aluminium Oxide)'.
AAO has two types
well type with a barrier layer blocking the bottom and through-hole type including through holes.
Characteristics of AAO
Technology > Large-Area AAO
Anodizing Technology
※ Source : colloidal and polymer science,
25 sep 2020, volume 299, 325-341
toolbox of porous anodic aluminum
oxide–based nanocomposites : from
preparation to application
AAO is known to be able to control pore size, barrier thickness, and interpore distance by controlling applied voltage, temperature, purity of raw material aluminum, and anodizing process.
※ Source : Nanomaterials 2023, 13(21), 2853 Advances
in the Fabrication of Nanoporous Anodic Aluminum Oxide and Its Applications to Sensors : A Review
Problems with Manufacturing Methods and
Products of current technology
Non-uniformity
After 1st Anodizing, the pores are not formed uniformly, so it is a generally known working method to remove them by etching and perform 2nd Anodizing, but even after 2nd Anodizing, the uniformity of the pore size is low.
Instability
Due to the characteristics of metal oxides, they are easily broken and lack flexibility, making them difficult to handle, and in many cases, they cannot be applied in the application product development process.
High Price
Only one membrane is manufactured from one Al substrate, and since it is easily broken and difficult to handle, large-area manufacturing is difficult, so the selling price is very high.
AAO has two types
well type with a barrier layer blocking the bottom and through-hole type including through holes.
Characteristics of AAO
Technology > Large-Area AAO Anodizing Technology
AAO is known to be able to control pore size, barrier thickness, and interpore distance by controlling applied voltage, temperature, purity of raw material aluminum, and anodizing process.
Problems with Manufacturing Methods and Products of current technology
Non-uniformity
After 1st Anodizing, the pores are not formed uniformly, so it is a generally known working method to remove them by etching and perform 2nd Anodizing, but even after 2nd Anodizing, the uniformity of the pore size is low.
Instability
Due to the characteristics of metal oxides, they are easily broken and lack flexibility, making them difficult to handle, and in many cases, they cannot be applied in the application product development process.
High Price
Only one membrane is manufactured from one Al substrate, and since it is easily broken and difficult to handle, large-area manufacturing is difficult, so the selling price is very high.
