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Thijs Versloot

Scientists have developed a material so dark that you can't see it... - 7 views

www.independent.co.uk/...t-you-cant-see-it-9602504.html

technology material light absorption

shared by Thijs Versloot on 14 Jul 14 - No Cached
  • Thijs Versloot on 14 Jul 14
     
    A British company has produced a "strange, alien" material so black that it absorbs all but 0.035 per cent of visual light, setting a new world record. To stare at the "super black" coating made of carbon nanotubes - each 10,000 times thinner than a human hair - is an odd experience.
  • Marcus Maertens on 15 Jul 14
     
    Finally! Nowadays blacks were always too bright for my taste...
  • Ma Ru on 19 Jul 14
     
    "No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it." I will keep waiting for my darkness-emitting diodes...
Marcus Maertens

Self-healing material can build itself from carbon in the air | MIT News - 2 views

news.mit.edu/...aling-material-carbon-air-1011

technology

shared by Marcus Maertens on 11 Oct 18 - No Cached
icheibas liked it
  • Marcus Maertens on 11 Oct 18
     
    The material the team used in these initial proof-of-concept experiments did make use of one biological component - chloroplasts, the light-harnessing components within plant cells, which the researchers obtained from spinach leaves.
jmlloren

Cheap and easy-to-make perovskite films rival silicon for efficiency. - 11 views

I just wanted to put another paper in this context: http://science.sciencemag.org/content/324/5923/63.short Solar cells based on Oxides, in particular BiFeO3. The key point here, is that while hali...

solar cells technology

started by fichbio on 09 Mar 16 1 follow-up, last by jmlloren on 11 Mar 16
jcunha liked it
jcunha

Measuring radiation damage on the fly - 0 views

news.mit.edu/...adiation-damage-real-time-1213

technology radiation real-time materials

shared by jcunha on 14 Dec 16 - No Cached
  • jcunha on 14 Dec 16
     
    Materials exposed to a high-radiation environment such as the inside of a nuclear reactor vessel can gradually degrade and weaken. A new approach to allow assessment of radiation damage in materials, on real time!
santecarloni

Artificial Braneworlds Made to Collide In Lab - Technology Review - 4 views

www.technologyreview.com/...27537

metamaterials cosmology PHY

shared by santecarloni on 31 Jan 12 - No Cached
pacome delva liked it
  • santecarloni on 31 Jan 12
     
    Physicists have simulated two universes colliding inside a metamaterial--  Now, this is cool (if it is true...)
  • ...1 more comment...
  • LeopoldS on 01 Feb 12
     
    we... the article is a bit overblown in my view ... except maybe the last paragraphs: "The collision between universe's is a variation on this theme. "The "colliding universe" scenario can be realized as a simple extension of our earlier experiments simulating the spacetime geometry in the vicinity of big bang," he says. He simulates an expanding universe using concetric rings of gold separated by a dielectric. "When the two concentric ring ("universe") patterns touch each other ("collide"), a Minkowski domain wall is created, in which the metallic stripes touch each other at a small angle," he says. Being able to recreate these exotic events in the lab is certainly interesting but it is beginning to lose its novelty. The problem is that this work is not telling us anything we didn't know--the universe behaves the same way inside a metamaterial as it does outside. What Smolyaninov needs is a way of using his exotic materials to do something interesting. In other words, he needs a killer app. Any ideas? "
  • Luzi Bergamin on 05 Feb 12
     
    Hm, they use more or less everything I don't especially like. They are nonmagnetic, so the relation materialGR is already rather weak. Usually, experimentalists prefer nonmagnetic media, since they are cheaper and broadband. At least the broadband is no argument here, since the frequency defines the "mass", which I find a rather strange point of view. And finally, they use strong anisotropy as a model of "time", which is rather problematic. Of course, the spatial direction with eps<0 appears in the wave equation with the same sign as time. But this does not mean that it behaves like time. But to teach material physicists that time is more than just a different sign in the wave equation seems to be as hopeless as to teach them that a black hole is more than something that absorbs all light... SIGHHH
  • LeopoldS on 10 Feb 12
     
    Luzi I miss you ...
Thijs Versloot

Nanophononic metamaterials to boost thermoelectric performance - 0 views

cleantechnica.com/...llars-creating-electricty-heat

technology energy nano

shared by Thijs Versloot on 24 Feb 14 - No Cached
  • Thijs Versloot on 24 Feb 14
     
    Thermoelectric materials can see their performance radically improved via the utilization of an array of 'nanoscale pillars,' according to new research from the University of Colorado Boulder. These tiny pillars, built directly onto the thermoelectric material, will reduce the heat flow through the material by a factor of two while not affecting the electrical flow.
pandomilla

Super-material shrugs off molten metal - 0 views

www.nature.com/...hrugs-off-molten-metal-1.14211

technology bio science

shared by pandomilla on 27 Nov 13 - No Cached
  • pandomilla on 27 Nov 13
     
    Droplets already bounce off water-repellent surfaces, but scientists have engineered materials that speed up the bounce to repel water faster. Even the brief contact time between a surface and a droplet that bounces off it can allow water to freeze or collect on the surface and cause damage.
jcunha

Interference of thermal waves - Can heat be controlled as waves? - 1 views

phys.org/...can-heat-be-controlled-as.html

technology PHY solid state thermal management science

shared by jcunha on 26 Jun 15 - No Cached
  • jcunha on 26 Jun 15
     
    Imagine a material that only admits thermal conduction for certain temperatures. Martin Maldovan from Georgia Tech holds a tiny thermoelectric device that turns cold on one side when current is applied. Recent research has focused on the possibility of using interference effects in phonon waves to control heat transport in materials. These are exciting news (see Nature Materials paper here http://www.nature.com/nmat/journal/v14/n7/full/nmat4308.html). Heterostructure research lead to outstanding new possibilities when applied to electronic transport (e.g. in quantum well and quantum dots) and to photonics (e.g. Quantum Cascade Laser tunnable lasers). Apparently the time has come to see selective thermal control in this way! Truly exciting!!
aborgg

Graphene sponge can absorb light and emit energetic electrons for breakthrough solar sa... - 1 views

nextbigfuture.com/...onge-can-absorb-light-and.html

space technology

shared by aborgg on 04 Aug 15 - No Cached
  • aborgg on 04 Aug 15
     
    The unique structure and properties of graphene and the morphology of the bulk graphene material make it capable of not only absorbing light at various wavelengths but also emitting energetic electrons efficiently enough to drive the bulk material following Newtonian mechanics.
  • aborgg on 04 Aug 15
     
    Hard to believe this should actually work, but would be quite a breakthrough indeed. I wonder, since the material should build up a significant electric potential over time, thus, pulling back the ejected electrons. Well, the paper apparently is not peer-reviewed, and I found some rather critical comments in some forums. Let's see if the experiment will be verified by another research team in due course.
Tobias Seidl

Protection mechanisms of the iron-plated armor of a deep-sea hydrothermal vent gastropo... - 1 views

www.pnas.org/...987.abstract

BIO material impact

shared by Tobias Seidl on 20 Jan 10 - Cached
  • Tobias Seidl on 20 Jan 10
     
    Here, we report new materials and mechanical design principles of the iron-plated multilayered structure of the natural armor of Crysomallon squamiferum, a recently discovered gastropod mollusc from the Kairei Indian hydrothermal vent field, which is unlike any other known natural or synthetic engineered armor.
LeopoldS

Macroscopic invisibility cloaking of visible light : Nature Communications : Nature Pub... - 3 views

www.nature.com/...ncomms1176.html

invisibility PHY science

shared by LeopoldS on 02 Feb 11 - No Cached
  • LeopoldS on 02 Feb 11
     
    and all this without magic metamaterials ...
  • ...1 more comment...
  • Luzi Bergamin on 02 Feb 11
     
    Wellwellwell! I don't know how I have to complain, since I could not yet read the full article, but I'm sure I will :-).
  • Luzi Bergamin on 02 Feb 11
     
    It's funny to see how people get more and more humble in the desperate attempt to save their stupid ideas... At the beginning was the brave and bold aim to cloak something in free space (in a sphere or a cylinder). This requires inhomogeneous, anisotropic, magnetic materials; hopeless!! So one reduces to one polarization, now we have inhomogenous, anisotropic materials; still hopeless! At this point one downgraded the pretension: instead of cloaking in free space, we make a "carpet cloak" and hide an object behind an invisible dent in a mirror. But if that shall be continuous, we still need inhomogeneity and this is very hard. So now instead of a dent we take a cone and then it is claimed to work ... for ONE polarization. But of course the cloak can't work at all incident angles... irony of fate: everything is now made from birefringent media, the antithesis of what the metamaterials dogma was at the beginning!
  • jmlloren on 04 Feb 11
     
    Hi Luzi, can you please send me the paper. We are writing a project based on sulfates and carbonates, and all this BS sounds great for the introduction (The authors used Calcite as birefringent material)
Tobias Seidl

Nonlinear viscoelastic biomaterials: meaningful characterization and engineering inspir... - 0 views

icb.oxfordjournals.org/...40

BIO material

shared by Tobias Seidl on 22 Jun 09 - Cached
  • Tobias Seidl on 22 Jun 09
     
    Any ideas for material studies?
ESA ACT

Collected Resources : biomaterials - 0 views

rsif.royalsocietypublishing.org/...biomaterials

BIO materials phy optics Photonics

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    A whole collection of articles on biomimetic materials science. Definitely worth a look.
ESA ACT

Self-replicating materials - 0 views

technology.newscientist.com/...selfreplicating-materials.html

nanotechnology DNA BIO PHY materials

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Looks like a combo of several ideas in our stock: nanomat + dna + self assembly...
Thijs Versloot

Researchers find new phase of carbon, make diamond at room temperature - 1 views

phys.org/...-diamond-room-temperature.html

carbon science

shared by Thijs Versloot on 01 Dec 15 - No Cached
  • Thijs Versloot on 01 Dec 15
     
    Researchers from North Carolina State University have discovered a new phase of solid carbon, called Q-carbon, which is distinct from the known phases of graphite and diamond. They have also developed a technique for using Q-carbon to make diamond-related structures at room temperature and at ambient atmospheric pressure in air. It turns out this configuration is harder than diamond, plus the material has a very low work function. The latter might be very interesting for electronics or as electrode material.
  • jcunha on 02 Dec 15
     
    Maybe* this is the wonder material with very low workfunction needed in the Photon Enhanced Thermionic Emitter future prototype :)
LeopoldS

natures darkest feathers almost as good as blackest material we can make - 3 views

www.nature.com/...s41467-017-02088-w.pdf

shared by LeopoldS on 09 Jan 18 - No Cached
  • LeopoldS on 09 Jan 18
     
    impressive achievement - extremely absorbant feather almost as black as our most "black" material
jaihobah

Black Hole Power: How String Theory Idea Could Lead to New Thermal-Energy Harvesting Te... - 0 views

spectrum.ieee.org/...thermal-energy-harvesting-tech

PHY NAN

shared by jaihobah on 21 Jul 17 - No Cached
LeopoldS liked it
  • jaihobah on 21 Jul 17
     
    A new class of exotic materials could find its way into next-generation technologies that efficiently convert waste heat into electrical current according to new research. Both the exotic materials and the means by which they generate electricity rely on a hybrid of advanced concepts-including string theory combined with black holes combined with cutting-edge condensed matter physics.
  • LeopoldS on 22 Jul 17
     
    Sounds spooky
Marcus Maertens

Mars Mission May Use 'Poop Shield' to Block Cosmic Rays | News & Opinion | PCMag.com - 1 views

www.pcmag.com/...0,2817,2416220,00.asp

space BIO

shared by Marcus Maertens on 12 Mar 13 - No Cached
  • Marcus Maertens on 12 Mar 13
     
    Quote: "It's a little queasy sounding, but there's no place for that material to go, and it makes great radiation shielding"
  • johannessimon81 on 12 Mar 13
     
    Judging by the color it probably contains a lot of melanin. ;-)
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