Skip to main content

Nanooze Magazine

Exploring the world
of science and nanotechnology...

menu

  • About Us
  • Articles
  • Blog
  • Meet a
    Scientist
  • Downloads
  • Glossary
  • Contact
  • Search

In this section:

  • About Us
  • Articles
  • Blog
  • Meet a Scientist
  • Downloads
  • Glossary
  • Subscribe
  • Search
Home → Blog → Blacker than Black?

Blacker than Black?

Posted on July 17, 2014 by Lynn Charles Rathbun

Color…… What do we mean when we say an object is “red”, or “blue” or “black”.

We see an object’s color as the color of light that it reflects.  A red shirt is red because it reflects (bounces back) red light (and absorbs all other colors).  And blue pants are blue because they reflect blue light (and absorb all other colors).  And if an object reflects ALL light, we call it white. And if an object does not reflect any light, we call it black. Black objects absorb all the light that falls on them.  Black is the ultimate dark color.

vantablack1But can anything be truly black, that is, absorb all light of all colors. And the answer is no, even the blackest black reflects just a little bit of light.  In really, everything we see as black is just some really really really dark shade of grey!

But, using nanotechnology, scientists in England have succeeded in making the blackest material ever. They call it “Vantablack”, and it absorbs 99.96% of all light that falls on it. This ultra-black material is formed by coating the surface with nanotubes. Nanotubes are tiny tubes of carbon atoms; Vantablack material consists of a dense forest of carbon nanotubes. Light gets  trapped between all the nanotubes and is ultimately absorbed, with very very little reflection.  The result is a surface that is weirdly black, very black. And because we sense texture and shape by reflected light, it is a surface that looks very very flat even when it isn’t.

So what is it good for? It would be a lot of trouble to go through just to have car that was blacker than everyone else’s. But scattered light really is a problem in various scientific instruments, for example, in telescopes. Using Vantablack to coat sensitive optical instruments can greatly improve their sensitivity.

Who would have thought that there was something to invent about “black”.

← If a Little Filter Is Good, then Shouldn’t a BIG One Be Even Better? FDA issues rules on nano →

Blog Archives

Featured Posts

Nano Tattoos

If you have a certain kind of diabetes you already know this—getting a tiny bit of blood and then... read more

Bonds Hold Atoms Together

The bonds that hold atoms together to form molecules are called covalent bonds. They are pretty... read more

View All Featured

Related Resources

  • NNIN Education Site
  • NNIN Nanotechnology Education Resouce Database
  • Education Portal at Nano.gov (US Government)
  • NISENet – Nanoscale Informal Sciece Education Network
  • Nano4me — the Nanotechnology Applications and Career Knowledge Network

Print Issues

Print issues of Nanooze are distributed free to classrooms on request.

Credits

Prof. Carl Batt Cornell University, Editor
Emily Maletz, Emily Maletz Graphic Design, Designer
Lynn Rathbun, CNF Laboratory Manager

Cornell University ©2013
Rights restricted.

Disclaimer

Nanooze is a project of the Cornell Nanoscale Facility part of the National Nanotechnology Coordinated Infrastructure (NNCI).