Mostrando entradas con la etiqueta Átomos. Mostrar todas las entradas
Mostrando entradas con la etiqueta Átomos. Mostrar todas las entradas

martes, 3 de diciembre de 2013

Single Molecule Images: IBM Scientists Capture Closest Photographs Showing Chemical Bonds (PHOTOS)

A team of IBM scientists--known for capturing the first close-up image of a single molecule in 2009--now have revealed incredibly detailed microscopic images that show the individual chemical bonds between atoms.

How did they get such remarkable close-ups? Using an atomic force microscope, the scientists were able to capture two images, using two different contrast mechanisms. These images not only illustrate the structure of individual nanographene molecules but also how atoms are bound together.

The research, which published in the Sept. 14 issue of Science magazine, is significant in furthering the study of graphene devices, which could potentially be used to replace existing technologies like microchips. The findings may also contribute to research tracking the paths of electrons during chemical reactions.

"We found two different contrast mechanisms to distinguish bonds. The first one is based on small differences in the force measured above the bonds," IBM scientist Leo Gross said in a written statement. "The second contrast mechanism really came as a surprise: Bonds appeared with different lengths in AFM measurements. With the help of ab initio calculations we found that the tilting of the carbon monoxide molecule at the tip apex is the cause of this contrast."

The multi-colored images show the length of the atomic bonds along with the density of electrons --so darker spots reveal the densest part of the molecule. Pairing length and density together, scientists are able to determine the types of bonds and what chemical reactions are taking place within the molecule.

"In the case of pentacene, we saw the bonds but we couldn't really differentiate them or see different properties of different bonds," Gross told BBC News. "Now we can really prove that... we can see different physical properties of different bonds, and that's really exciting."

Earlier this year, IBM scientists captured the first single molecule images that showed how an electric charge is distributed. Now their most recent images further this research and mark an important step in nanoscale physics.

PHOTOS:
This image, captured by IBM scientists using an atomic force microscope, shows a nanographene molecule exhibiting carbon-carbon bonds. (Image courtesy of IBM Research - Zurich)
(Image courtesy of IBM Research - Zurich)

ORIGINAL: Huffington Post
09/15/2012 

domingo, 9 de junio de 2013

Life & The Universe Most Astounding Fact - Neil deGrasse Tyson

ORIGINAL: YouTube
Jan 8, 2013

Astrophysicist Dr. Neil DeGrasse Tyson was asked by a reader of TIME magazine, "What is the most astounding fact you can share with us about the Universe?" This is his answer.

www.facebook.com/EducateInspireChange

Special thanks to:
Reid Gower http://saganseries.com/
Carl Sagan http://www.hulu.com/cosmos
Neil deGrasse Tyson http://www.facebook.com/neiltyson
NASA http://www.nasa.gov/
...for their inspiration.

CREDITS
Narration: TIME Magazine's "10 Questions for Neil Degrasse Tyson"
http://www.youtube.com/watch?v=wiOwqD...
Music: "To Build a Home" by the Cinematic Orchestra feat. Patrick Watson
http://www.cinematicorchestra.com/

Video (in order of appearance):
IMAX: Hubble 3D (Orion)
http://www.imax.com/hubble/
Yellowstone: Battle for Life (Tree & Waterfall)
http://www.bbc.co.uk/programmes/b00jcdml
Supernova to Crab Nebula
http://www.spacetelescope.org/videos/...
BBC: Wonders of the Solar System (formation of the solar system)
http://www.bbc.co.uk/programmes/b00qyxfb
Accretion and First Eukaryotes from the 2011 film "Tree of Life" directed by Terrence Malick
http://en.wikipedia.org/wiki/Accretio...)
http://en.wikipedia.org/wiki/Origin_o...
http://en.wikipedia.org/wiki/Timeline...
http://www.wired.com/wiredscience/200...
http://www.twowaysthroughlife.com/
BBC: Charles Darwin and the Tree of Life
http://www.wellcometreeoflife.org/
"Salar de Uyuni, Bolivia" by Ayrton Orio (Model: Xharon Kendelker)
http://vimeo.com/9505354
"Afghanistan - touch down in flight" by Augustin Pictures
http://vimeo.com/31426899
http://lukasugustin.de
"mongolia!" by wiissa
http://vimeo.com/27876709
http://wiissa.com

Excerpt from "Outside In", Copyright Stephen van Vuuren/SV2 Studios (Saturn's moon Mimas)
http://www.outsideinthemovie.com
IMAX: Hubble 3D (Inside Orion Nebula)
http://en.wikipedia.org/wiki/Orion_Ne...
Shuttle Launch from 1985 IMAX film "The Dream is Alive"
http://en.wikipedia.org/wiki/The_Drea...
"Earth -- Time Lapse View from Space, Fly Over -- NASA, ISS" by Michael Konig
http://www.youtube.com/watch?v=ls9yJT...
http://koenigm.com
Excerpt from "The Island" - La Palma Time Lapse Video by Christoph Malin
http://vimeo.com/27539860
http://christophmalin.com
Galaxy Map and Galaxy Formation by NCSA's Advanced Visualization Lab
http://avl.ncsa.illinois.edu/
"Mars sunset" captured by NASA's Mars Exploration Rover Spirit http://www.nasa.gov/multimedia/imageg...

Edited by Max Schlickenmeyer

Neil goes on to say "For me, that is the most profound revelation of 20th century astrophysics and I look forward to what the 21st century will bring us, given the frontiers that are now unfolding."

Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use. All copyrighted materials contained herein belong to their respective copyright holders, I do not claim ownership over any of these materials. I realize no profit, monetary or otherwise, from the exhibition of these videos.

lunes, 3 de junio de 2013

Imaging Breakthrough: See Atomic Bonds Before and After Molecular Reaction

ORIGINAL: Wired
By Nadia Drake
05.30.13

Molecular Rearrangements
A ringed, carbon-containing molecule, shown both before and after it has rearranged itself, with the two most common reaction products included. The scale bars measure 3 angstroms, or three ten-billionths of a meter, across. Image and Caption: Lawrence Berkeley National Laboratory and University of California at Berkeley

Reactant 1



Product 2



Product 3


Product 4


Product 5
The team predicted the existence of Product 5, but it accounted for less than 1 percent of the reaction mixture. Image: S. Wickenburg, A. Riss, D. J. Mowbray, F. R. Fischer
For the first time, scientists have visually captured a molecule at single-atom resolution in the act of rearranging its bonds. The images look startlingly similar to the stick diagrams in chemistry textbooks.

Until now, scientists were only able to infer molecular structures. Using atomic force microscopy, the individual atomic bonds — each a few ten-millionths of a millimeter long – that connect the carbon molecule’s 26 carbon and 14 hydrogen atoms are clearly visible. The results are reported online May 30 in Science.

The team initially set out to precisely assemble nanostructures made from graphene
, a single-layer material in which carbon atoms are arranged in repeating, hexagonal patterns. Building the carbon honeycombs required rearranging atoms from a linear chain into the six-sided shapes; the reaction can produce several different molecules. UC Berkeley chemist Felix Fischer and his colleagues wanted to visualize the molecules to make sure they’d done it right.

To document the graphene recipe, Fischer needed a powerful imaging device, and he turned to the atomic force microscope housed in physicist Michael Crommie’s UC Berkeley lab. Non-contact atomic force microscopy uses a very fine, sharp point to read the electrical forces produced by molecules; as the tip is moved near a molecule’s surface, it’s deflected by different charges, producing an image of how the atoms and bonds are aligned.

With it, the team managed to visualize not only the carbon atoms but the bonds between them, created by shared electrons. They placed a ringed carbon structure on a silver plate and heated it until the molecule rearranged. Subsequent cooling trapped the reaction products, which as it turned out, contained three unexpected products and one molecule the scientists had predicted.

domingo, 5 de mayo de 2013

A Boy And His Atom: The World's Smallest Movie

ORIGINAL: IBM

The ability to move single atoms, one of the smallest particles of any element in the universe, is crucial to IBM's research in the field of atomic-scale memory. In 2012, IBM scientists announced the creation of the world's smallest magnetic memory bit, made of just 12 atoms. This breakthrough could transform computing by providing the world with devices that have access to unprecedented levels of data storage. But even nanophysicists need to have a little fun. In that spirit, the scientists moved atoms by using their scanning tunneling microscope to make … a movie, which has been verified by Guinness World Records™ as The World’s Smallest Stop-Motion Film.


Exploring the limits of storage ... and moviemaking



Take a look behind the scenes of the world's smallest movie (4:56)


Today, it takes roughly one million atoms to store a single bit of data on a computer or electronic device. A bit is the basic unit of information in computing that can have only one of two values, one or zero. Eight bits form a byte. Recently, IBM Research announced it can now store that same bit of information in just 12 atoms.

From 1,000,000 to 12 — that’s a dramatic breakthrough that not only has the potential to make our computers and devices smaller and more powerful, but also holds enormous implications for the way entire industries operate.

viernes, 20 de abril de 2012

Magnifying the Universe


Copyright 2012. Magnifying the Universe by Number Sleuth.

The above is an interactive infographic. We have also developed a complimentary poster that you can view here: Sizes of the Universe poster. If you're technically inclined, here's a look at the references we used to construct these infographics: Facts About The Universe.



Introduction:

This interactive infographic from Number Sleuth accurately illustrates the scale of over 100 items within the observable universe ranging from galaxies to insects, nebulae and stars to molecules and atoms. Numerous hot points along the zoom slider allow for direct access to planets, animals, the hydrogen atom and more. As you scroll, a handy dial spins to show you your present magnification level.

While other sites have tried to magnify the universe, no one else has done so with real photographs and 3D renderings. To fully capture the awe of the vastly different sizes of the Pillars of Creation, Andromeda, the sun, elephants and HIV, you really need to see images, not just illustrations of these items. Stunningly enough, the Cat's Eye Nebula is surprising similar to coated vesicles, showing that even though the nebula is more than 40,000,000,000,000,000,000,000 times larger, many things are similar in our universe.

We hope you have a blast magnifying the universe, know that each time you zoom in a depth, you're magnifying the universe 10x ... and every time you zoom out, the bigger objects are 1/10th of their prior size. If you zoom from the biggest object, The Observable Universe (8.8 x 10E26 ... or 880,000,000,000,000,000,000,000,000m across), all the way down to the hydrogen atom's proton nucleus (1.7 x 10E-15 ... or 0.0000000000000017m across), you will have zoomed in over 100,000,000,000,000,000,000,000,000,000,000,000,000,000x! Unbelievable isn't it? Our universe really is immensely massive and surprisingly small.

How To Use:

Step 1:
To experience this interactive infographic in full screen (our recommendation) click the "Full Screen" button in the top right corner of the infographic.

Step 2:
Choose one of nine starting points by moving your mouse over and clicking one of the 9 images (atoms, animals, buildings, mountains, planets, stars, nebulae, galaxies and the observable universe).

Step 3:
Now on the bottom of the infographic, there is a blue blue dot that you can click on with your mouse.Drag the blue circle left to go "up" in size and drag the blue circle right to go "down" in size

Step 4:
To relocate to one of the nine entry points, click the corresponding yellow dot on the scroller at the bottom of the page

Credits:
You can view a list of image credits used in the construction of this infographic by clicking here.

Produced for Number Sleuth by Science is Beautiful in coordination with Mandril Design and Killer Infographics.