Nanoparticles

• Nanoscience

  refers to structure that are 1-100nm in size
• Nanoparticles

  they are smaller than fine particles (diameters between 100 and 2500 nm)
• Coarse particles

  Have diameters between 1x10(-5)m and 2.5x10(-6)m, they are often referred to as dust
• Sa:V ratio

  As the side of cube decreases by a factor of 10, the surface area to volume ratio increases by a factor of 10.
• Nanoparticles

  May have properties different from those for the same materials but in bulk because of their high Sa:V ratio
• Uses for nanoparticles:

  • medicine
  • electronics
  • cosmetics and sun creams
  • deoderants
• Nanoparticle applications

  New applications for nanoparticulate materials are an important area of research
• Nano-particulate materials (advantages)

  • Better at protecting the skin from the sun
  • Better skin coverage
• Nano-particulate materials (disadvantages)

  • Unsure of the damage they could do if contaminated with cells
  • May damage the environment when washed away