Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Building 3D fractals on a nano scale

Corners with nano pores
Corners with nano pores

Abstract:
It starts with one 3D structure with eight planes, an octahedron. This repeats itself to smaller octahedra: 625 after just four steps. At every corner of a new octahedron, a successive octahedron is formed. A truly fascinating 3D fractal ‘building' is formed on the micro and nano scale. It can be used for high performance filtering, for example. Scientists of the MESA+ Institute for Nanotechnology of the University of Twente in The Netherlands present these structures in the Journal of Micromechanics and Microengineering (JMM).

Building 3D fractals on a nano scale

Enschede, Netherlands | Posted on June 1st, 2013

A fractal is a geometric structure that can repeat itself towards infinity. Zooming in on a fragment of it, the original structure becomes visible again. A major advantage of a 3D fractal is that the effective surface rises with every next step. Looking at the octahedra, after four steps the final structure is not much bigger than the original octahedron, but the effective surface has been multiplied by 6.5. The smallest octahedra are 300 nanometers in size, with on every corner a nano pore of 100 nanometer. Having 625 of these nano pores on a limited surface area, a very effective filer with low flow resistance is formed. The Dutch scientists also experiment with capturing living cells within these octahedral, to be able to study the interaction between the cells. Further interesting research is related to sending light through the octahedron structure: how will it interact?

Corner lithography

To be able to create the repeated 3D structure, the scientists developed a technique called ‘corner lithography''. At first, a pyramid form is etched in silicon. The next step is applying a layer of silicon nitride on the pyramid. After removing this subsequently, a tiny bit of nitride stays in the corner of the pyramid, functioning as a ‘stop'. When this is removed, the silicon underneath is etched through the tiny hole. Automatically, a structure is formed alongside the silicon crystal plane. This is the first octahedron, formed by ‘auto alignment'. The process is repeated with a new layer of silicon nitride. The size of the new octahedra is determined by the etch period. In this case, every octahedron in the next step is half the size of the previous one. The advantage of corner lithography is its relative simplicity. No advanced technology is needed to create each individual nano pore. On the contrary: in just four steps thousands of fractals, each having 625 tiny holes can be processed on a wafer, in parallel. More than four steps is also possible, but this places higher demands on the etching process.

The research has been performed in the Transducers Science and Technology group, which is part of the MESA+ Institute for Nanotechnology of the University of Twente.

####

For more information, please click here

Contacts:
Wiebe van der Veen
+31612185692

Copyright © AlphaGalileo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Full bibliographic information

Related News Press

News and information

Diamonds and quantum information processing on the nano scale August 31st, 2016

Device to control 'color' of electrons in graphene provides path to future electronics August 31st, 2016

Graphene key to growing 2-dimensional semiconductor with extraordinary properties August 30th, 2016

University of Akron researchers find thin layers of water can become ice-like at room temperature: Results could lead to an assortment of anti-friction solutions August 30th, 2016

Nanomedicine

Designing ultrasound tools with Lego-like proteins August 29th, 2016

Nanofiber scaffolds demonstrate new features in the behavior of stem and cancer cells August 25th, 2016

Johns Hopkins scientists track metabolic pathways to find drug combination for pancreatic cancer August 25th, 2016

50 years after the release of the film 'Fantastic Voyage,' science upstages fiction: Science upstages fiction with nanorobotic agents designed to travel in the human body to treat cancer August 25th, 2016

Discoveries

Diamonds and quantum information processing on the nano scale August 31st, 2016

Device to control 'color' of electrons in graphene provides path to future electronics August 31st, 2016

Graphene key to growing 2-dimensional semiconductor with extraordinary properties August 30th, 2016

University of Akron researchers find thin layers of water can become ice-like at room temperature: Results could lead to an assortment of anti-friction solutions August 30th, 2016

Materials/Metamaterials

Device to control 'color' of electrons in graphene provides path to future electronics August 31st, 2016

Graphene key to growing 2-dimensional semiconductor with extraordinary properties August 30th, 2016

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Graphene under pressure August 26th, 2016

Announcements

Diamonds and quantum information processing on the nano scale August 31st, 2016

Device to control 'color' of electrons in graphene provides path to future electronics August 31st, 2016

Graphene key to growing 2-dimensional semiconductor with extraordinary properties August 30th, 2016

University of Akron researchers find thin layers of water can become ice-like at room temperature: Results could lead to an assortment of anti-friction solutions August 30th, 2016

Nanobiotechnology

Designing ultrasound tools with Lego-like proteins August 29th, 2016

Analog DNA circuit does math in a test tube: DNA computers could one day be programmed to diagnose and treat disease August 25th, 2016

Nanofiber scaffolds demonstrate new features in the behavior of stem and cancer cells August 25th, 2016

Johns Hopkins scientists track metabolic pathways to find drug combination for pancreatic cancer August 25th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic