The Science of Nanotechnology Could Lead to Radical Improvements for Space Exploration
When it comes to taking the next "giant leap" in space exploration, NASA is thinking small -- really small.
In laboratories around the country, NASA is supporting the burgeoning science of nanotechnology. The basic idea is to learn to deal with matter at the atomic scale -- to be able to control individual atoms and molecules well enough to design molecule-size machines, advanced electronics and "smart" materials.
If visionaries are right, nanotechnology could lead to robots you can hold on your fingertip, self-healing spacesuits, space elevators and other fantastic devices. Some of these things may take 20-plus years to fully develop; others are taking shape in the laboratory today.
Simply making things smaller has its advantages. Imagine, for example, if the Mars rovers Spirit and Opportunity could have been made as small as a beetle and could scurry over rocks and gravel as a beetle can, sampling minerals and searching for clues to the history of water on Mars. Hundreds or thousands of these diminutive robots could have been sent in the same capsules that carried the two desk-size rovers, enabling scientists to explore much more of the planet's surface -- and increasing the odds of stumbling across a fossilized Martian bacterium!
But nanotech is about more than just shrinking things. When scientists can deliberately order and structure matter at the molecular level, amazing new properties sometimes emerge.
An excellent example is that darling of the nanotech world, the carbon nanotube. Carbon occurs naturally as graphite -- the soft, black material often used in pencil leads -- and as diamond. The only difference between the two is the arrangement of the carbon atoms. When scientists arrange the same carbon atoms into a "chicken wire" pattern and roll them up into miniscule tubes only 10 atoms across, the resulting "nanotubes" acquire some rather extraordinary traits.
- Have 100 times the tensile strength of steel, but only one-sixth the weight.
- Are 40 times stronger than graphite fibers.
- Conduct electricity better than copper.
- Can be either conductors or semiconductors (like computer chips), depending on the arrangement of atoms.
- Are excellent conductors of heat.
Much of current nanotechnology research worldwide focuses on these nanotubes. Scientists have proposed using them for a wide range of applications: in the high-strength, low-weight cable needed for a space elevator; as molecular wires for nano-scale electronics; embedded in microprocessors to help siphon off heat; and as tiny rods and gears in nano-scale machines, just to name a few.
Adapted from: http://science.nasa.gov/science-news/science-at-nasa/2005/27jul_nanotech