A Brief Introduction to Nanotechnology

 
Materials with major dimensions above about 100 nanometers have physical, optical, electronic and other properties conforming with familiar Classical Physics. About 100 years ago scientists began to discover that materials with basic dimensions below 1 nanometer behave according to a strange set of counterintuitive rules termed Quantum Physics, where weird effects such as tunneling, spin and entanglement hold sway.

Only recently have scientists begun to discover that structures inhabiting the transition region between 1 nanometer and 100 nanometers (the 'mesoscale') hold even more bizarre surprises, displaying physical properties previously considered unattainable or even impossible. Examples include:

  • Photonic crystals exhibiting negative refractive index
  • Carbon nanotubes supporting spectacular strength, electric current density, and thermal conductivity

It is theoretically possible to define extremely complex structures involving millions of atoms within a space less than 100 nanometers across, which can exploit the bizarre mesoscale physics.

At the nanoscale, physics, chemistry, biology, material science and engineering all converge toward the same principals and tools.

National Science Foundation estimates that there will be a $1 trillion global market for nanotechnology in little more than a decade.

Nanotechnology manufacturing

Objects at the nanoscale can be manufactured by either of two basic approaches.
  • Top-down manufacturing refers to scaled-down traditional bulk material processes such as:
    • Lithography and etching
    • Grinding and polishing
    • Printing and embossing
  • More desireable but difficult is bottom-up creation of structures by precise assembling of atoms and molecules, by such means as:
    • Crystalization
    • Catalysis
    • Chemistry
    • Life processes (eg ribosomes)
    • Universal molecular assemblers (distant future)

Where are we now?

Nanotechnology has already been applied in such products as:
  • Stain-resistant, wrinkle-free slacks (Nano-Tex, Docker)
  • Titanium dioxide nanoparticle ultraviolet sunblocks (Estée Lauder)
  • Nanocomposite automobile running boards (General Motors)
  • Self-cleaning glass (Pilkington)
  • Quantum dot biomarkers (Quantum Dot Corp)
  • Carbon nanotube probes for atomic force microscopes

Near-term future

Coming soon are:
  • High-brightness carbon nanotube based displays for computer screens and televisions
  • Polarizing films for glare reduction on flat-panel displays
  • Nanoparticle drugs for inhalation and topical delivery
  • Miniature methanol-based fuel cells
  • Flexible 'electronic paper' displays
  • Cheap, efficient solar cells
  • Nano-catalysts for large scale liquifaction of coal
  • Denser, faster computer storage technologies
  • Nanowire based chemical and biological sensors

Medium-term future

  • Cancer treatments that directly attack tumor cells without harming surrounding tissue

Long-term future

  • Life extension
  • Ageing reversal
  • Bio enhancement
  • Cogno enhancement
  • Quantum computers
  • Molecular Assemblers

Copyright © 2002,2003 Nanotech Associates
Page last updated 12/14/03