Phone: +86 0755-2350 5289
PRODUCT Products
Products / Products
  • Release time: 2018 - 03 - 12
    Ultrathin AAO templates have self-organized honeycomb-like nanopores, and they are usually from several ten nanometers to several hundred nanometers in thickness.Ultrathin AAO templates have been widely used for fabrication of large-scale ordered arrays of surface nanostructures such as nanodots and nanoholes on the surface of substrates. Pores of ultrathin AAO template are uniform in diameter and highly ordered in a short-range. In addition, the material (Al2O3) is transparent in the near-infrared and visible spectrum, and is electrically insulated. Compared to other technology for making ord...
    Ultrathin AAO templates have self-organized honeycomb-like nanopores, and they are usually from several ten nanometers to several hundred nanometers in thickness.Ultrathin AAO templates have been widely used for fabrication of large-scale ordered arrays of surface nanostructures such as nanodots and nanoholes on the surface of substrates. Pores of ultrathin AAO template are uniform in diameter and highly ordered in a short-range. In addition, the material (Al2O3) is transparent in the near-infrared and visible spectrum, and is electrically insulated. Compared to other technology for making ord...
  • Release time: 2018 - 03 - 13
    A new type of AAO product (V-shape AAO) is developed by Topmembranes Technology. Compared to other anodic alumina membranes products, this profile of type of AAO is precisely tailored by the synergistic control of anodizing time, etching time and cyclic times, resulting in a unique structure for a wide range of applications.For more applications of V-shape AAO, please refer to: Adv. Mater. 2014, 26, 2805;ACS Nano, 2015, 9, 10287;Adv. Funct. Mater. 2017, 27, 1604720;Nanoscale Research Letters 2013, 8,268;J. Phys. Chem. C 2017, 121, 9757; Nano Energy, 2016, 22, 539; ACS Nano 2017, 11, 5113. ...
  • Release time: 2018 - 03 - 13
    AAO on Al substrate has honeycomb-like structure (shown in Fig. 1), composed with hexagon column of Al2O3, with a circular pore in the center. At the end of the pore, there is a half-sphere shape barrier layer oxide layer in contact with aluminum. The porous oxide film contains mutually parallel cylindrical pores extending from the barrier oxide layer to the film surface. AAO on Al substrate is the simplest product in AAO family, which can be fabricated into large area with a high success rate. Fig. 2 shows a typical picture of the AAO template.Fig. 1. Schematic of AAO on Al substrate.  F...
  • Release time: 2018 - 03 - 13
    Isotropic AAO templates, often referring to thicker AAO to be different from ultrathin AAO membrane, are widely used for a number of different fields. Topmembranes technology is specialized to make high quality isotropic AAO templates, with highly uniform and regular pore on both sides of the surfaces. The pores are arranged hexagonally within the single grains of the aluminum. The translucent nature of AAO is appealing to applications in biomedical field.Fig. 1. The structure diagram of isotropic AAO templates.Fig. 2. Typical SEM images of both sides of isotropic AAO template. Fig. 3. Ty...
  • Release time: 2018 - 03 - 13
    An sprayer, or airbrush, is an ideal tool for applying a thin layer of material on the substrate.We sell this for your convenience, the price of all set is less than $50. Depending on the amount of your purchase of other product, this airbrush can be free for your use.
Contact information

Telephone : +86 0755-2350 5289

Mail : service@topmembranes.com

Web : http://www.topmembranes.com

China · Shenzhen · Headquarters

Address : Tingwei Industrial Park, 6 Liufang Rd., Baoan District

Product Name

Isotropic AAO templates

Date: 2018-03-13
Author: 141

Isotropic AAO templates, often referring to thicker AAO to be different from ultrathin AAO membrane, are widely used for a number of different fields. Topmembranes technology is specialized to make high quality isotropic AAO templates, with highly uniform and regular pore on both sides of the surfaces. The pores are arranged hexagonally within the single grains of the aluminum. The translucent nature of AAO is appealing to applications in biomedical field.


Isotropic AAO templates Product description

Fig. 1. The structure diagram of isotropic AAO templates.


Isotropic AAO templates Product description

Fig. 2. Typical SEM images of both sides of isotropic AAO template.


Isotropic AAO templates Product description

Fig. 3. Typical SEM images of the cross section of isotropic AAO templates.


Isotropic AAO templates are made from AAO on Al substrate. When the thickness is less than 1μm, they are called ultrathin AAO membrane, which often need other materials as supports. When the thickness reaches several tens micron, the structure can be self-supported, and has certain strength and elasticity, which can be used for filtration membrane.  Our Isotropic AAO templates have uniform pore diameter from both side of the membrane, and the arrangement is highly ordered. Isotropic AAO template is a great material for making one dimensional nanomaterial via different technique such as electrochemical deposition, hydrothermal process, atomic layer deposition, etc.



Isotropic AAO templates Product description

Fig.4 The orientation of the isotropic AAO template in the package.


pic AAO template in the package.

Normally, the pore diameter at front side is slightly different with that of back side.     
The side facing to the logo is back side. 
Since AAO membrane is fragile, treat it with tweezers gently, plastic and flat end ones are suggested.
Note: the front side and back side look the same, if you accidently mix up, contact us for assistant as needed. Normally, have will also receive some small pieces of irregular shape AAO for your imaging use based on request.
Isotropic AAO templates can be removed by 5% phosphate acid at 30℃ slowly, or by 5 wt.% NaOH at room temperature quickly. You can image the structure with either SEM or AFM. Due to the non-conductive nature, the surface need to be sputtered with gold or carbon before SEM test. A fresh cross-section view can be obtain by breaking off the membrane.


Isotropic AAO templates Product description

Fig. 5. A typical photo of isotropic AAO template.


Isotropic AAO templates Product description

Fig. 6. Isotropic AAO templates with different sizes


Isotropic AAO templates Product description

Fig. 7 Transmission of light at short range.The interpore distance is (a) 65nm, (b) 100nm, (c)125nm, (d) 450nm. 


About residues:
Isotropic AAO membranes are cut by laser cutting machine from a larger AAO membrane. During cutting, the focused laser beam is directed at the material. It will then either melts, burns, vaporizes away. After cutting, there will be a lot of aluminium oxide fragments scattering around the cutting line. Since the membranes are brittle, air blow was not used during cutting. The residues are the aluminium oxide fragments attached to the membranes during collection. There residues are easy to be removed by ultrasonic cleaning in deionized water for several minutes. Please choose an ultrasonic cleaner with a lower power such as 50~100W.

About the pore diameter difference between front and back pores:

The diameter difference between top and bottom pores is caused mainly by production process and the componential structure of the pores. Originally, the pores of the membranes are not through. There is barrier layer at the bottom of each pore, just like the bottom of a test tube. The barrier layer is removed by acid etching to obtain Isotropic AAO membranes. The etching rates of the top and bottom part of the pore may be different, and it will lead to diameter difference between top and bottom part of the pore.  For details, please refer to reference: ACS Appl. Mater. Interfaces 2013, 5, 3441. In this situation, the inner diameter change continuously from top to bottom. In fact, since the length of the pore is about 50000 nm, the diameter difference (several or tens nanometers) is too small.


Isotropic AAO templates Product description

Fig. 8. Schematic outline of the pore-opening process (cross-sectional view) which shows the etching mechanism. The arrows in the figure show the etching directions, while the lengths of the arrows are proportional to the etching rate. Reference: Small 2010, 6, 695.


Another situation is related to the opening states of the barrier layer. As shown in figure 8, during the acid etching process, the barrier layer firstly open and then disappear. If the etching process is stopped before barrier layer disappearing, the size difference between the top and bottom pore will be larger, and the shape of the most bottom pores is not circle. This situation only happens to these products: DP065-010-50000, DP065-015-50000, DP065-020-50000, DP100-030-50000, DP100-035-50000, and DP125-030-50000. Take DP065-015-50000 (front 30 nm, back 15 nm) as an example, the length of 15 nm size pore is only ~20nm (i.e. the thickness of the barrier layer), and the diameter of other part of the pore varies from about 20 nm (bottom) to about 30 nm (top).

Note: DP450-390S-50000 is not suitable for filtration due to seldom local micron order holes.


Previous:NoneNext:None
Latest News / More>>
2018 . 03 . 29
Clicks: 65
New metal-mesh membrane could solve longstanding problems and lead to inexpensive power storage.David L. Chandler | MIT News Office January 22, 2018A type of battery first invented nearly five de...
2018 . 03 . 29
Clicks: 36
Proponents of clean energy will soon have a new source to add to their existing array of solar, wind, and hydropower: osmotic power.BY ANTHONY CUTHBERTSON ON 7/14/16 AT 4:03 AMRiver mouths around the ...
2018 . 03 . 29
Clicks: 17
A graphene-based membrane could be used in countries that do not have the financial infrastructure to fund large desalination plants.BY ANTHONY CUTHBERTSON ON 4/4/17 AT 9:27 AMScientists have created ...
2018 . 03 . 29
Clicks: 27
February 16, 2017Posted in: Healthcare, IBM 5 in 5, SystemsJust last month, IBM released its “5 in 5” predictions, an exercise to identify five innovations that will have an impact on society in five ...
2018 . 03 . 29
Clicks: 11
Material can filter nanometer-sized molecules at 10 to 100 times the rate of commercial membranes.Jennifer Chu | MIT News Office June 28, 2017Dialysis, in the most general sense, is the process b...
2018 . 03 . 29
Clicks: 12
Department of Chemical Engineering Professor Zachary Smith is working on new polymeric membranes that can greatly reduce energy use in chemical separations.Eric Brown | MIT Industrial Liaison Program&...
WeChat
Phone
Tel: +86 0755-2350 5289
Email:service@topmembranes.com
Address:Tingwei Industrial Park, 6 Liufang Rd., Baoan District, Shenzhen, China
Fax:+86 0755-2788 8009
Copyright ©2018 - 2022 Shenzhen Top Membrane Technology Co., Ltd.
Rhino cloud offers enterprise cloud services
犀牛云提供云计算服务