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Appl. Sci. 2018, 8(7), 1055; https://doi.org/10.3390/app8071055

A New Technique for Batch Production of Tubular Anodic Aluminum Oxide Films for Filtering Applications

1
Department of Mechanical Engineering, National United University, Miaoli 36003, Taiwan
2
Hydrotech Research Institute, National Taiwan University, Taipei 10617, Taiwan
3
Department of Chemistry and Physics, Fayetteville State University, Fayetteville, NC 28301, USA
4
Department of Energy Engineering, National United University, Miaoli 36003, Taiwan
5
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
6
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
*
Authors to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 31 May 2018 / Accepted: 26 June 2018 / Published: 28 June 2018
(This article belongs to the Special Issue Mechanical Behaviour of Aluminium Alloys)
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Abstract

With larger surface areas and nanochannels for mass delivery and gas diffusion, three-dimensional tubular anodic aluminum oxide (AAO) films have practical advantages over two-dimensional AAO films for medical and energy applications. In this research, we have developed a process for batch production of tubular AAO films using a 6061 Al tube. The tubular AAO films have open nano-channels on both sides, with average pore dimensions of about 60 nm and pore densities of about 108 to 109 pore/cm2. It was found that the porous AAO material with nano-channel structure exhibited dialysis behavior, allowing for liquid/gas exudation through diffusion between the inner and outer surfaces of the tubular AAO films. Ar gas bearing test and aeration test were conducted to find the pressure bearing capacity of tubular AAO films. It was demonstrated that the AAO film with a thickness of 100 μm can resist an argon pressure up to 8 atm; however, 30 μm AAO film can only withstand 3 atm of Ar gas. The tubular AAO films with exudation characteristics have the potential for applications in advanced technologies, such as liquid or gas filters, drug delivery, and energy applications. View Full-Text
Keywords: tubular anodic aluminum oxide (AAO); porous material; nanochannels; filtering tubular anodic aluminum oxide (AAO); porous material; nanochannels; filtering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hun, C.W.; Chiu, Y.-J.; Luo, Z.; Chen, C.C.; Chen, S.H. A New Technique for Batch Production of Tubular Anodic Aluminum Oxide Films for Filtering Applications. Appl. Sci. 2018, 8, 1055.

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