Fabrication of Thinner Anodic Aluminum Oxide Based Microchannels

2012 ◽  
Vol 550-553 ◽  
pp. 2046-2050 ◽  
Author(s):  
Mahadi Hasan ◽  
Ajab Khan Kasi ◽  
Jafar Khan Kasi ◽  
Nitin Afzulpurkar ◽  
Supanit Porntheeraphat ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Ph Value ◽  
Membrane Thickness ◽  
Average Pore ◽  
Wall Width ◽  
Fluid Filtration ◽  
Anodic Aluminum ◽  
Filtration System

When thickness of a membrane reduces its mechanical properties go down but thinner the membrane better the performance of the membrane in terms of filtration. In this research we fabricated a fluid filtration system with a very thin anodic aluminum oxide (AAO) membrane. The system consists of microchannels at one side of membrane while other side is flat. For both sides inlet and outlet are given. The system can facilitate two types of fluid to flow at two sides of membrane for filtration. The membrane thickness achieved was 4 μm. The average pore diameter was 50 nm. The nanopores inside the membrane are highly straight and perpendicular to the surface. The fabricated channel and wall width was 200 µm and 100 µm successively. The pillars in between microchannels hold the membrane which is termed as partial freestanding alumina (PFA) and thereby retain desired mechanical properties of the membrane. The system was tested for diffusion between DI water and salted water. The DI water was flowed in channels and salted water on other side of membrane. The pH value of DI water changed after flow. Due to channel walls, AAO membrane fabricated in this system can tolerate more pressure which leads it to be used for convective flow by applying higher pressure gradient.

The Change of Mechanical Properties for Anodic Aluminum Oxide by Heat Treatment

2006 ◽  
Vol 317-318 ◽  
pp. 323-326 ◽  
Author(s):  
D.J. Park ◽  
S.H. Kim ◽  
J.H. Lee ◽  
Seong Hee Lee ◽  
Yong Ho Choa
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Property ◽  
Oxalic Acid ◽  
Aluminum Oxide ◽  
Crystalline Phase ◽  
Anodic Aluminum Oxide ◽  
Treatment Temperature ◽  
Microstructure Change ◽  
Anodic Aluminum

Anodic aluminum oxide (AAO) was prepared in three types of aqueous solutions with various applied voltage. The mechanical property of AAO prepared in different electrolyte was investigated and hardness was increased on account of the increase of the thickness between pores. The mechanical property and microstructure change of AAO prepared in oxalic acid at 40V was investigated by heat treatment. AAO prepared in oxalic acid at 40V was transformed from amorphous to crystalline phase by heat treatment above 800oC and hardness was increased about 2.6 times with increase of heat treatment temperature.

Template Assisted Fabrication of TiO2 and BaTiO3 Nanotubes

2012 ◽  
Vol 271-272 ◽  
pp. 107-111 ◽  
Author(s):  
Chien Chon Chen ◽  
Chin Hua Cheng ◽  
Guo Yi Tang ◽  
Tai Nan Lin ◽  
Chung Kwei Lin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Electronic Devices ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Anodic Aluminum ◽  
Working Electrode ◽  
Peeling Off

This paper discussed fabrication of TiO2 and BaTiO3 nanotubes by sol-gel method and used anodic aluminum oxide (AAO) as template. The mechanical properties of TiO2 or BaTiO3 NTs are not great, so a longer tube can crack easily, leading to the peeling off of the NTs film from the Ti substrate. Therefore, we propose to use AAO as a template, followed by deposition of TiO2 and BaTiO3 NT inside AAO to make a working electrode for further electronic devices.

Fabrication of Low Cost Anodic Aluminum Oxide (AAO) Tubular Membrane and their Application for Hemodialysis

2012 ◽  
Vol 550-553 ◽  
pp. 2040-2045 ◽  
Author(s):  
Ajab Khan Kasi ◽  
Jafar Khan Kasi ◽  
Mahadi Hasan ◽  
Nitin Afzulpurkar ◽  
Sirapat Pratontep ◽  
...  
Keyword(s):  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Low Cost ◽  
Membrane Thickness ◽  
Low Grade ◽  
Fluid Filtration ◽  
Tubular Membrane ◽  
Anodic Aluminum ◽  
Self Organized ◽  
Impurity Defects

This paper reports the fabrication of AAO tubular membrane using 99.35% and 99.56% pure Al and their potential application for hemodialysis. Here we discussed the effect of impurity on membrane structure. We found that the self organized structure of AAO nanochannels minimizes impurity defects in membrane. If micro size impurity blocks the generation of nanochannels then the neighboring nanochannels bend and make branches to fulfill that gap. We observed that if impurity size is less than the AAO membrane thickness then it does not produce any micro size hole. In low grade Al the periodic hexagonal order was disturbed however there was no big difference in pore diameter. It was observed that such type of membrane do not have any leakage and it can be used for fluid filtration. The fabricated tubular membrane was used for hemodialysis successfully. The hemodialysis results show that AAO tubular membrane can be used for both diffusive and convective filtration

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.

Nanoporous Anodic Aluminum Oxide (AAO) Thin Film Fabrication with Low-Grade Aluminium

2016 ◽  
Vol 872 ◽  
pp. 152-156
Author(s):  
Peerawith Sumtong ◽  
Apiluck Eiad-Ua ◽  
Khattiya Chalapat
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Process Conditions ◽  
Low Grade ◽  
Average Pore ◽  
Aluminium Substrate ◽  
Anodization Time ◽  
Anodic Aluminum

Anodic aluminum oxide (AAO) is well known for its nanoscopic structures and its applications in microfluidics, sensors and nanoelectronics. The pore density, the pore diameter, and the interpore distance of an AAO substrate can be controlled by varying anodization process conditions. In this research, the self-organized two-step anodization is carried out with a low-grade (Al6061) aluminium substrate using a 40V voltage at the temperature of 2 to 5 °C. Three experiments are done with the anodization time of 24 hours, 48 hours and 72 hours. The structural features of AAO are characterized by a field emission electron microscope (FE-SEM). The data from FE-SEM show that the average pore diameter increases with the anodization time, and that the Al6061 aluminium substrate can be used to fabricate a nanoporous AAO film with an average pore diameter smaller than 17 nanometers.

Electromechanical Properties of Vertically Aligned Carbon Nanotube

2013 ◽  
Vol 705 ◽  
pp. 332-336 ◽  
Author(s):  
Alimorad Rashidi ◽  
M. Omidi ◽  
M. Choolaei ◽  
M. Nazarzadeh ◽  
A. Yadegari ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Aluminum Oxide ◽  
Physical Properties ◽  
Anodic Aluminum Oxide ◽  
Electromechanical Properties ◽  
Simple Method ◽  
Anodic Aluminum ◽  
Cylindrical Pores ◽  
Vertically Aligned

In this paper a simple method is used for fabrication of vertically aligned carbon nanotube (VACNT) within the cylindrical pores anodic aluminum oxide (AAO) substrate. Electronic and mechanical properties of VACNT have been obtained after removing AAO substrate. Vertically aligned carbon nanotube shows very interesting electromechanical properties which can be used in CNT-based sensors to detect chemical analytical or physical properties such as temperature orpressure.

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