Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What sort of structures does nanoscience refer to?
   • Nanoscience refers to structures that are 1-100 nm in size, of the order of a few hundred atoms.
2. What is the size of a fine particle and which is smaller, nanoparticles or fine particles?
   • NanoParticles, are smaller than fine Particles (PM2.5), which have diameters between 100 and 2500 nm (1 x 10-7 m and 2.5 x 10-6 m).
3. What is the diameter of coarse particles, such as dust?
   • Coarse Particles (PM10) have diameters between 1 x 10-5 m and 2.5 x 10-6 m. Coarse Particles are often referred to as dust.
4. What happens to the size of the surface area to volume ratio of a cube is you decrease the size of the sides by a factor or 10?
   • As the side of cube decreases by a factor of 10 the surface area to volume ratio increases by a factor of 10.
5. Why are the properties of nanoparticles different from those for the same materials in bulk?
   • NanoParticles may have properties different from those for the same materials in bulk because of their high surface area to volume ratio. It may also mean that smaller quantities are needed to be effective than for materials with normal Particle sizes.
6. How do nanoparticles compare in size to individual atoms?
   • NanoParticles are made of up to 1000 atoms or molecules, therefore their size is larger than that of an atom.
7. What are the main applications of nanoparticles?
   • NanoParticles have many applications in medicine, in electronics, in cosmetics and sun creams, as deodorants, and as catalysts.
8. What are the advantages and disadvantages of using nanoparticles?
   • The advantages of nanoParticles are endless as they link to many new technilogies both commercially and medically however there are disadvantages as well. There are some concerns that nanoParticles may be toxic to people. They may be able to enter the brain from the bloodstream and cause harm. Some people think more tests should take place before nanoParticles of a material are used on a wider scale.