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.
Highlights
A New Technique for Batch Production of TubularDepartment of Energy Engineering, National United University, Miaoli 36003, Taiwan Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
High-quality anodic aluminum oxide (AAO) films provide ordered straight channels, with a diameter of 10–500 nm, pore density of 107 –1011 pore/cm2, and thickness of 1–300 μm [1,2]
In this paper, based on our previous experience in AAO producing, a new technique is proposed for the batch production of tubular AAO films, and such batch production is an important factor in materials engineering [22]
Summary
Department of Energy Engineering, National United University, Miaoli 36003, Taiwan Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
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