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Mars Base

All-carbon-nanotube transistor can be crumpled like a piece of paper - 0 views

www.physorg.com/...stor-crumpled-piece-paper.html

scibyte36 transistor nanotube

shared by Mars Base on 03 Mar 12 - No Cached
  • Thanks to the flexible yet robust properties of carbon nanotubes, researchers have previously fabricated transistors that can be rolled, folded, and stretched
  • Japan has made an all-carbon-nanotube transistor that can be crumpled like a piece of paper without degradation of its electrical properties
  • the most bendable reported to date that doesn’t experience a loss in performance
  • ...2 more annotations...
  • researchers, Shinya Aikawa and coauthors from the University of Tokyo and the Tokyo University of Science
  • could lead to active electronic devices that are applied like a sticker or an adhesive bandage, as well as to wearable electronics.”
Mars Base

Jellyfish inspires latest ocean-powered robot (w/ video) - 0 views

www.physorg.com/...ocean-powered-robot-video.html

scibyte39 robot MarMedia

shared by Mars Base on 21 Mar 12 - No Cached
  • American researchers have created a robotic jellyfish, named Robojelly, which not only exhibits characteristics ideal to use in underwater search and rescue operations, but could, theoretically at least, never run out of energy thanks to it being fuelled by hydrogen.
  • Constructed from a set of smart materials
  • ability to change shape or size as a result of a stimulus, and carbon nanotubes, Robojelly is able to mimic the natural movements of a jellyfish when placed in a water tank and is powered by chemical reactions taking place on its surface.
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  • To our knowledge, this is the first successful powering of an underwater robot using external hydrogen as a fuel source
  • jellyfish is an ideal invertebrate to base the vehicle on due to its simple swimming action
  • replicated in the vehicle using commercially-available shape memory alloys (SMA) – smart materials that "remember" their original shape – wrapped in carbon nanotubes and coated with a platinum black powder.
  • powered by heat-producing chemical reactions between the oxygen and hydrogen in water and the platinum on its surface
  • renewable element means Robojelly can regenerate fuel from its natural surroundings and therefore doesn't require an external power source or the constant replacement of batteries.
  • heat given off by these reactions is transferred to the artificial muscles of the robot, causing them to transform into different shapes.
  • robot still needs development to achieve full functionality and efficiency
Mars Base

Superhard carbon material could crack diamond - 0 views

www.physorg.com/...d-carbon-material-diamond.html

scibyte25

shared by Mars Base on 09 Dec 11 - No Cached
  • By applying extreme pressure to compress and flatten carbon nanotubes, scientists have discovered that they can create a new carbon polymer that simulations show is hard enough to crack diamond
  • directly compressing carbon nanotube bundles to design and to synthesize novel metastable carbon allotropes
  • applying pressure to some of these carbon allotropes can change the bonds, resulting in different forms of carbon with novel electronic and mechanical properties
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  • the scientists here used a recently developed technique called the Crystal Structure Analysis by Particle Swarm Optimization
Mars Base

New 'super-black' material absorbs light across multiple wavelength bands - 0 views

www.physorg.com/...sorbs-multiple-wavelength.html

light scibyte21

shared by Mars Base on 10 Nov 11 - No Cached
  • NASA engineers have produced a material that absorbs on average more than 99 percent of the ultraviolet, visible, infrared, and far-infrared light that hits it
  • The team has since reconfirmed the material's absorption capabilities in additional testing
  • Though other researchers are reporting near-perfect absorption levels mainly in the ultraviolet and visible, our material is darn near perfect across multiple wavelength bands, from the ultraviolet to the far infrared
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  • "No one else has achieved this milestone yet."
  • The nanotech-based coating is a thin layer of multi-walled carbon nanotubes, tiny hollow tubes made of pure carbon about 10,000 times thinner than a strand of human hair
  • They are positioned vertically on various substrate materials much like a shag rug
  • team has grown the nanotubes on silicon, silicon nitride, titanium, and stainless steel, materials commonly used in space-based scientific instruments
  • application is stray-light suppression
  • the team found that the material absorbs 99.5 percent of the light in the ultraviolet and visible
  • 98 percent in the longer or far-infrared bands
  • We knew it was absorbent. We just didn't think it would be this absorbent from the ultraviolet to the far infrared
  • If used in detectors and other instrument components, the technology would allow scientists to gather hard-to-obtain measurements of objects so distant in the universe that astronomers no longer can see them in visible light or those in high-contrast areas, including planets in orbit around other stars
  • More than 90 percent of the light Earth-monitoring instruments gather comes from the atmosphere, overwhelming the faint signal they are trying to retrieve
Mars Base

New carbon allotrope could have a variety of applications - 0 views

www.physorg.com/...rope-variety-applications.html

scibyte25

shared by Mars Base on 10 Dec 11 - No Cached
  • Since the 1980s, scientists have been synthesizing newer allotropes, including carbon nanotubes, graphene, and fullerenes, all of which have had a significant scientific and technological impact.
  • scientists have been investigating a wide variety of new – and sometimes elusive – carbon allotropes
  • scientists also noted that T-carbon could have astronomical implications as a potential component of interstellar dust and carbon exoplanets
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  • long-standing puzzle in astronomy known as the ‘carbon crisis’ in interstellar dust
  • Observations by the Hubble telescope revealed that the carbon budget in dust is deep in the red, and there is not sufficient carbon in dust to account for the light distortions
  • researchers would like to synthesize the new allotrope in the lab, although they say that this would likely be very difficult.
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