Tag Archives: Turkey

Nanowires in Turkey

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Turkish researchers at Bilkent University in Ankara have recently discovered a means of reliably producing nanowires through a thermal size-reduction process that will be featured on the cover of Nature Materials July 2011 issue. From a June 17, 2011 news item in the Hürriyet Daily News (Istanbul),

A group of Turkish researchers at an Ankara university have manufactured the longest and thinnest nanowires ever produced, by employing a novel method to shrink matter 10-million fold.

The invention, discovered at Bilkent University’s National Nanotechnology Research Center, or UNAM, is set to appear on the cover of Nature Material magazine’s July edition.

“At this moment, we may not even be able to predict what things will be produced [in the future] using this method,” said Associate Professor Mehmet Bayýndýr who led the research team.

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The research team was trying to obtain a patent for their invention, as well as preparing to apply to the Guinness Book of Records for producing the world’s longest and thinnest semiconductor nanowire.

Here’s a little more information about nanowires and some detail about the thermal-size reduction process from the study in Nature Materials’ (full article is behind a paywall) online publication,

Nanowires are arguably the most studied nanomaterial model to make functional devices and arrays. … Here we report a new thermal size-reduction process to produce well-ordered, globally oriented, indefinitely long nanowire and nanotube arrays with different materials. The new technique involves iterative co-drawing of hermetically sealed multimaterials in compatible polymer matrices similar to fibre drawing. Globally oriented, endlessly parallel, axially and radially uniform semiconducting and piezoelectric nanowire and nanotube arrays hundreds of metres long, with nanowire diameters less than 15 nm, are obtained. The resulting nanostructures are sealed inside a flexible substrate, facilitating the handling of and electrical contacting to the nanowires. Inexpensive, high-throughput, multimaterial nanowire arrays pave the way for applications including nanowire-based large-area flexible sensor platforms, phase-changememory, nanostructure-enhanced photovoltaics, semiconductor nanophotonics, dielectric metamaterials,linear and nonlinear photonics and nanowire-enabled high-performance composites.

For interested parties, here’s the citation:

Arrays of indefinitely long uniform nanowires and nanotubes by Mecit Yaman, Tural Khudiyev, Erol Ozur, Mehmet Kanik, Ozan Aktas, Ekin O. Ozgur, Hakan Deniz, Enes Korkut, and Mehmet Bayindir. Nature Materials July 2011. Published online June 12, 2011. doi:10.1038/nmat3038

 

Happy T Day! Robots; Nano-enabled prosthetics; ISEA 2009 aesthetics and prosthetics; Global TV (national edition): part 2

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Happy Thanksgiving to everyone as Canada celebrates.

Since I have mentioned military robots in the not too distant past, this recent headline Two Military Robots That Rival the Creepiest Sci-Fi Creatures for Kit Eaton’s Fast Company article caught my eye. One of the robots, Big Dog (and its companion prototype Small Dog), utilizes artificial intelligence to navigate terrain and assist soldiers in the field. The larger one can carry heavy loads while the smaller one could be used for reconnaissance. The other robot is a cyborg beetle. Electrodes have been implanted so the beetle’s flight patterns can be controlled. There are two videos, one for each robot. It is a very disconcerting experience watching the beetle being flown by someone standing in front of a set of controls.

Keeping with the theme of planting electrodes, I found something on Azonano about a bio- adaptive prosthetic hand. Funded by the European Union as a nanotechnology project, here’s more from the news item,

What is unique about the sophisticated prototype artificial hand developed by the SMARTHAND partners is that not only does it replicate the movements of a real hand, but it also gives the user sensations of touch and feeling. The researchers said the hand has 4 electric motors and 40 sensors that are activated when pressed against an object. These sensors stimulate the arm’s nerves to activate a part in the brain that enables patients to feel the objects.

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Led by Sweden’s Lund University, the researchers continue to work on the sensory feedback system within the robotic hand. The hurdle they need to cross is to make the cables and electric motors smaller. Nanotechnology could help the team iron out any problems. Specifically, they would implant a tiny processing unit, a power source and a trans-skin communication method into the user of the hand to optimise functionality.

It’s a fascinating read which brought to mind an ISEA (International Symposium on Electronic Arts) 2009 presentation by Dr. Lanfranco Aceti (professor at Sabanci University in Istanbul, Turkey). Titled The Aesthetic Beauty of the Artificial: When Prosthetic Bodies Become an Art Expression of Empowering Design Technologies, the presentation was a revelation. Dr. Aceti’s research yielded a rather surprising insight from a doctor in London, England who specializes in prosthetics. According to the doctor, women want limbs that most closely resemble their original but men (under 50 years old usually) want limbs that are metallic and/or look high tech. Lanfranco suggested that the men have been influenced by movies. Take for example, Wolverine (Wikipedia entry here) where the hero’s skeleton has been reinforced with metal and he can make his claws (now covered with metal) protrude from his arms at will. You can view Lanfranco’s site here or a simple biography about him here.

A few months back I posted about  prosthetics and design student projects and I’m starting to sense a trend emerging from these bits and pieces of information. There is the repair aspect to prosthetics but there is also an increasing interest not just in the aesthetics but in the notion of improving on the original. At its most extreme, I can imagine people wanting to remove perfectly healthy limbs and organs to get an improved version.

I got a chance to see part 2 of Global TV’s (broadcast in Canada) nanotechnology series, Small Wonders. As I’ve noticed that my link for part 1 of the series is no longer useful I am providing a link to part 2 which will land you on the search page. If you don’t see part 2 listed, go to the mutimedia tab which is just above the search results and where you can find part 1 and I assume, at some point, part 2.

As I hoped, they focused on nanotechnology projects in the materials field in part 2 of the series. They noted that nanotechnology-based materials in sports equipment and clothing are already available in the market place. An interview with Dr. Robert Wolkow at the National Institute of Nanotechnology and at the Physics Dept. at the University of Alberta, featured a discussion about replacing silicon chips with more efficient materials built at the molecular level.